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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。奥门永利402ocm

ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

五星娱乐网址多少ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

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ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。

ravel Surviv a Theory of EEverything 时间旅在万有理论下可行吗?Tom STom Siegfriedd 汤姆·西格弗里德 many universses, typicalally those onV shows or i in movies, tim time trave is not much momore difficult cult than driviriving downtowntown in any major city dug rush hour. real life, time travel isnsn't so easy. . In fact,'s probably im impossiblea fantasy  farfetchedhan visitinice's Wondand, finding goold at the d of a rainbownbow or cleansing all thhe hate speech off of Fac.Yet time travl does not necenecessarily violate the  laws of physicsics. In Einstein's theof gravity — general relativity — spaceace and time aare merged spacetime, wch allows ffor the possibility of pathys that cobend back tthe past aop back to t the future.e. Such paths  are known a closed timellike curves.NoNobody thinks t that generaal relativity'sity's time loo loops woulbe practical for time trtravel even ifn if they  possible. one thing, th they mighexist only ur certain circmstances — t the universwould have to bo be rotating, ing, and notpanding — as ts the mathemtician Kurt Gdel showed n the 1940s. But the univrse is expandnding, and prprobably isn't rotating, soso that dampepens the pcts for revisvisiting the S Stone Age o acquiring a pet dinosaur.r.Besides, eveneven if such pa pathways d exist, buildinlding a ship to traversese them wouldd cost morean all the DeLoreans(and all oth transportatioon vehicles) ever made.would need a  a cruising spespeed of 140 miles per se second. And th no place stop for gas (or whatever, the fuel tank tank would hd have to be more than a trillion timehe size of  an oil tankerker.So for praactical puroses, time tvel's time has  not yet arriverrived. But et even if it possible onlynly in priiple, the potential ramifictions for the the basic phcs of the unrse might maake it worth th the time investigate ite it.A first srst step would be to att attempt to igure out exaexactly wha the relevantt laws of phhysics reallre. Einstei general relattivity is greeat, but indubbitably not thee last word abo about the physics of t universe. Affter all, itt coexists asily withntum mechanics, which rules the subatomic world aresumably, ce everything s made of ubatomic stuffuff, the rest est of the univiverse as wel. Whether  quantum–generral relativy combo trulypermits tim travel mighepend on what the ultimmate correct t theory coining the ttwo turns ouout to be.al candidae theoriesave been deped for mergingging general l relativity d quantum mhanics into a unified theory. It's an op question whhether thes candidates would allow timme travel in  something ike the way geeneral relvity does,  philosophChristian Wüthrhrich of the Unniversity of Geneva notes in a new papaper.It's pible, he says,  that a theory eory that susupersedes geneneral relativity might still in some waynclude thevalent of general relativityity's timelike e loops.Even n if time loopops exist ine fundamentalheory, though there's still no guaraee that they would be perved in the emergent lat large-scae spacetime that would relevant in reaal life. Foor that matte Wüthrich poinints out, pcting the istence of timeime travel los might be tataken as eviidence againstst the theorry, consider the serioulikelihood that time travell really isn't possible at al all.In any casy case, invigating whher quantum  gravity theies retain neral relativity's timevel loophole ca can illuminatinate many t tough questis that must be answered velop a successcessful theory and understannd how it relelates to generral relativiy. “For thiseason alone,” Wüthrich writess, “the quesestion of e travel beyon general relaivity is wortorth our while.hile.”在许多宇宙,通影视剧中的宇宙,时间旅行并并不比高峰时段在任何大城市的闹市区开车困难多多少。