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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。网络赌博游戏导航

Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

永利澳门娱乐网址Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

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Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。

Survive a Theory of Evthing 时间旅行在万有万有理论下可行吗?TSiegfried 汤姆·西格汤姆·西格弗里德In may universes, typicallyse on TV showsows or in mos, time travavel is nomuch more ifficult than dn driving dtown in any major city duuring rush hr.In real life, time travelavel isn't soso easy. In fact, it's prrobably impossssible, a antasy more farfetched than visitingice's Wonderlland, findigold at thd of a rainnbow or cleang all theate speech o off of Fak.Yet timetravel does nott necessarily vy violate the he laws of  physics. In Einstein's theory of gravy — general re relativity — s space andime are merged ged as spacetime, whicallows for tpossibilit pathways tt could beck to the pastpast and loop back to the fuuture. Such pah paths are known as closed timelike ccurves.Nobody tdy thinks thatat general relativity's timime loops wod be practicl for time tvel even ifhey are posse. For one thing, theyt exist only under certain ccircumstancces — the ununiverse would have to b be rotating, and not eanding — a the mathematiatician Kurt G G del showed n the 1940s. Bu. But the universe is exxpanding, and probably iisn't rotating, so that mpens the ppects for revsiting thee Age or acqiring a peosaur.Besidedes, even if such pathwways did exist,t, buildinship to traaverse them wold cost more t than all e DeLoreansand all other transportationon vehicles) er made. It wouuld need a uising speedof 140,000 miles per cond. And withno place to stop for gas (or whatever the fuel tawould havee more than trillion tmes the si an oil tankker.So for ppractical puposes, time tvel's time ha has not yet ar arrived. Buteven if it's ps possible on only in principle, he potentialramification for the bphysics of thee universeht make it worrth the tio investigate it.A first  step would be to attemp to figureout exactlyat the relevanvant laws of physics rly are. Einstetein's general l relativityty is great, but indubibly not the last word aboubout the pysics of theiverse. After ll, it coexists uneasily witith quantumhanics, which r rules the su subatomic d and presly, since everything iis made of batomic stuff the rest off the universeas well. Whethether the quantum–genl relativitycombo truly pey permits time me travel mig depend onhat the ultimaate correceory combinining the two tuns out to be.See.Several candcandidate theories have been develofor mergineneral relaty and quanmechanics i a unified theoeory. It'sopen question ion whether  these canates would aow time trael in somethinthing like tthe way generall relativity d does, philoosopher Chritian Wüthrich of the Univeersity of Geneneva notesn a new papr.It's possibsible, he says,s, that a theoory that spersedes generl relativity might stitill in soay include  equivalent general relaelativity's ttimelike lo.Even if tim loops exist  the fundamental theorthough, thre's still no guarantee thhat they wbe preserven the emergent large-scale spacetime e that would ld be relevan in real life.For that ma, Wüthrich points out, prediccting the existence of timee travel loops ps might be takken as evidencnce against  the theory,considering th serious likelihood that me travel realeally isn't ossible at  all.In any e, investigatining whether qur quantum grgravity theories retain geeral relaty's time travelavel loophcan illuminate nate many touggh questios that must be answered to delop a succssful theory ad understand how it relates tes to generalrelativity. “F. “For thisreason alone,” Wüthricrites, “the question of time time travel ond generaativity is woorth our while.ile.”在许多宇宙影视剧中的宇宙,时间旅行旅行并不比高峰时段在任何一个任何一个大城市的闹市区开车难多少。