时间旅行是可能的吗？（二）
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Vaibhav Jain
There are thousand of theories about time travel and mostly people see time travel is impossible because of several reasons & paradoxes.So here is the most famous paradox.
GRANDFATHER PARADOX : Let say you invented a time machine. You went back in time and killed your grandfather. Which means your father and mother have never been born. Which means that you would have never been born. Which means you couldn't have gone back in time and killed your grandfather.
关于时间旅行有上千种理论，大多数人认为时间旅行是不可能的，因为有几个原因和悖论。
所以这里是最著名的悖论。
祖父悖论：假设你发明了一台时间机器。你回到过去并杀死了你的祖父。这意味着你的父亲和母亲从未出生过。这意味着你将永远不会出生。这意味着你不可能回到过去并杀死你的祖父。
There are thousand of theories about time travel and mostly people see time travel is impossible because of several reasons & paradoxes.So here is the most famous paradox.
GRANDFATHER PARADOX : Let say you invented a time machine. You went back in time and killed your grandfather. Which means your father and mother have never been born. Which means that you would have never been born. Which means you couldn't have gone back in time and killed your grandfather.
关于时间旅行有上千种理论，大多数人认为时间旅行是不可能的，因为有几个原因和悖论。
所以这里是最著名的悖论。
祖父悖论：假设你发明了一台时间机器。你回到过去并杀死了你的祖父。这意味着你的父亲和母亲从未出生过。这意味着你将永远不会出生。这意味着你不可能回到过去并杀死你的祖父。
So , in brief . It's a contradiction. If you himself killed your grandfather then then you will not be born. And if you are not born then how come you are alive, invented time machine and traveled back.
This theory also became basic idea for Time machine movie (2002).
简而言之。这是一个矛盾。如果你自己杀了你的祖父，那么你就不会出生了。如果你不是天生的，那么你为什么还活着，发明了时间机器，然后又回来了。
这一理论也成为了《时间机器》电影（2002）的基本思想。
This theory also became basic idea for Time machine movie (2002).
简而言之。这是一个矛盾。如果你自己杀了你的祖父，那么你就不会出生了。如果你不是天生的，那么你为什么还活着，发明了时间机器，然后又回来了。
这一理论也成为了《时间机器》电影（2002）的基本思想。
1. Professor loves a girl.
2. She dies.
3. Professor invents time machine.
4. Goes back in time and tries to save the girl. But every time he saw her getting died with different ways.
5. He couldn't get answer. So he travels in future where he gets his answer
you build this machine because of your girl's death. If she had lived then time machine wouldn't existed . So how could you use your machine to go back to save her.
1. 教授喜欢一个女孩。
2. 她死了。
3. 教授发明了时间机器。
4. 回到过去，试图拯救这个女孩。但每次他都看到她以不同的方式死去。
5. 他无法得到答案。于是他来到了未来，在那里他得到了答案
你建造这台机器是因为你女孩的死。如果她还活着，那么时间机器就不会存在了。所以你怎么能用你的机器回到过去救她。
2. She dies.
3. Professor invents time machine.
4. Goes back in time and tries to save the girl. But every time he saw her getting died with different ways.
5. He couldn't get answer. So he travels in future where he gets his answer
you build this machine because of your girl's death. If she had lived then time machine wouldn't existed . So how could you use your machine to go back to save her.
1. 教授喜欢一个女孩。
2. 她死了。
3. 教授发明了时间机器。
4. 回到过去，试图拯救这个女孩。但每次他都看到她以不同的方式死去。
5. 他无法得到答案。于是他来到了未来，在那里他得到了答案
你建造这台机器是因为你女孩的死。如果她还活着，那么时间机器就不会存在了。所以你怎么能用你的机器回到过去救她。
Pranjal Somani
Theoretically, YES.
Time travel is the concept of moving backwards and/or forwards to different points in time, in a manner analogous to moving through space and different from the normal "flow" of time to an earthbound observer.A central problem with time travel to the past is the violation of causality; should an effect precede its cause, it would give rise to the possibility of temporal paradox. Some interpretations of time travel resolve this by accepting the possibility of travel between parallel realities or universes. Anyways, I have listed some ways of time travel which have been proposed by scientific community but are obviously not tecnically achieved as of yet and may be a matter of debate that these could be realised or not.
从理论上讲，是的。
时间旅行是向后或向前移动到不同的时间点的概念，其方式类似于在空间中移动，与地球上的观察者的正常时间 "流动 "不同。一些对时间旅行的解释通过接受平行现实或宇宙之间旅行的可能性来解决这个问题。总之，我已经列出了科学界提出的一些时间旅行的方法，但显然在技术上还没有实现，而且这些方法是否能够实现，可能是一个争论的问题。
Theoretically, YES.
Time travel is the concept of moving backwards and/or forwards to different points in time, in a manner analogous to moving through space and different from the normal "flow" of time to an earthbound observer.A central problem with time travel to the past is the violation of causality; should an effect precede its cause, it would give rise to the possibility of temporal paradox. Some interpretations of time travel resolve this by accepting the possibility of travel between parallel realities or universes. Anyways, I have listed some ways of time travel which have been proposed by scientific community but are obviously not tecnically achieved as of yet and may be a matter of debate that these could be realised or not.
从理论上讲，是的。
时间旅行是向后或向前移动到不同的时间点的概念，其方式类似于在空间中移动，与地球上的观察者的正常时间 "流动 "不同。一些对时间旅行的解释通过接受平行现实或宇宙之间旅行的可能性来解决这个问题。总之，我已经列出了科学界提出的一些时间旅行的方法，但显然在技术上还没有实现，而且这些方法是否能够实现，可能是一个争论的问题。
WORMHOLES-A formal definition-if a Minkowski spacetime contains a compact region Ω, and if the topology of Ω is of the form Ω ~ R x Σ, where Σ is a three-manifold of nontrivial topology, whose boundary has topology of the form dΣ ~ S2, and if, furthermore, the hypersurfaces Σ are all spacelike, then the region Ω contains a quasi-permanent intra-universe wormhole. Einstein-Rosen bridges (Wormholes) are bridges between areas of space that can be modeled as vacuum solutions to the Einstein field equations by combining models of a black hole and a white hole.
虫洞--正式定义--如果一个闵可夫斯基时空包含一个紧凑的区域Ω，如果Ω的拓扑结构是Ω ~ R x Σ的形式，其中Σ是一个非微观拓扑的三面体，其边界的拓扑结构是dΣ ~ S2的形式，此外，如果超曲面Σ都是空间的，那么该区域Ω就包含一个准永久性的宇宙内虫洞。爱因斯坦-罗森桥（Wormholes）是空间区域之间的桥梁，通过结合黑洞和白洞的模型，可以被模拟成爱因斯坦场方程的真空解。
虫洞--正式定义--如果一个闵可夫斯基时空包含一个紧凑的区域Ω，如果Ω的拓扑结构是Ω ~ R x Σ的形式，其中Σ是一个非微观拓扑的三面体，其边界的拓扑结构是dΣ ~ S2的形式，此外，如果超曲面Σ都是空间的，那么该区域Ω就包含一个准永久性的宇宙内虫洞。爱因斯坦-罗森桥（Wormholes）是空间区域之间的桥梁，通过结合黑洞和白洞的模型，可以被模拟成爱因斯坦场方程的真空解。
A wormhole could allow time travel. This could be accomplished by accelerating one end of the wormhole to a high velocity relative to the other, and then sometime later bringing it back; relativistic time dilation would result in the accelerated wormhole mouth aging less than the stationary one as seen by an external observer, similar to what is seen in the twin paradox. However, time connects differently through the wormhole than outside it, so that synchronized clocks at each mouth will remain synchronized to someone traveling through the wormhole itself, no matter how the mouths move around. This means that anything which entered the accelerated wormhole mouth would exit the stationary one at a point in time prior to its entry.
虫洞可以允许时间旅行。这可以通过将虫洞的一端加速到相对于另一端的高速度来实现，然后在某个时候将其带回来；相对论的时间膨胀会导致加速的虫洞口比外部观察者看到的静止的虫洞口老化得更少，类似于双子悖论中的情况。然而，通过虫洞的时间连接方式与虫洞外不同，因此，无论虫洞口如何移动，每个虫洞口的同步时钟都会与穿越虫洞本身的人保持同步。这意味着，任何进入加速虫洞口的东西都会在其进入之前的一个时间点退出静止的虫洞口。
虫洞可以允许时间旅行。这可以通过将虫洞的一端加速到相对于另一端的高速度来实现，然后在某个时候将其带回来；相对论的时间膨胀会导致加速的虫洞口比外部观察者看到的静止的虫洞口老化得更少，类似于双子悖论中的情况。然而，通过虫洞的时间连接方式与虫洞外不同，因此，无论虫洞口如何移动，每个虫洞口的同步时钟都会与穿越虫洞本身的人保持同步。这意味着，任何进入加速虫洞口的东西都会在其进入之前的一个时间点退出静止的虫洞口。
It is thought that it may not be possible to convert a wormhole into a time machine in this manner when quantum effects( feedback loop of virtual particles destabilizes the wormhole) are incorporated. However, to keep the hole open we need 'exotic matter' (has negative energy density), which is observed in the CASIMIR Effect. The debate on this matter is described by physicist Kip S. Thorne( who worked with Nolan for Interstellar) in the book Black Holes and Time Warps.
人们认为，当量子效应（虚拟粒子的反馈回路使虫洞不稳定）被纳入时，以这种方式将虫洞转换为时间机器可能是不可能的。然而，为了保持黑洞的开放，我们需要“外来物质”（具有负能量密度），这在卡西米尔效应中可以观察到。物理学家基普·S·索恩（曾与诺兰合作过《星际穿越》）在《黑洞与时间战》一书中描述了关于这一问题的辩论。
人们认为，当量子效应（虚拟粒子的反馈回路使虫洞不稳定）被纳入时，以这种方式将虫洞转换为时间机器可能是不可能的。然而，为了保持黑洞的开放，我们需要“外来物质”（具有负能量密度），这在卡西米尔效应中可以观察到。物理学家基普·S·索恩（曾与诺兰合作过《星际穿越》）在《黑洞与时间战》一书中描述了关于这一问题的辩论。
COSMIC STRINGS-are a hypothetical 1-dimensional (spatially) topological defect in the fabric of spacetime left over from the formation of the universe. Some scientists have suggested using cosmic strings to construct a time machine. By maneuvering two cosmic strings close together – or possibly just one string plus a black hole – it is theoretically possible to create a whole array of closed time-like curves.Your best bet is to fire two infinitely long cosmic strings past each other at very high speeds, then fly your ship around them in a carefully calculated figure eight. In theory, you would be able to emerge anywhere, anytime! However, these are purely theoretical obxts with no experimental observation of its existence.
宇宙弦是宇宙形成后时空结构中的一种假设的一维（空间）拓扑缺陷。一些科学家建议使用宇宙弦来构建时间机器。通过操纵两条宇宙弦靠近——或者可能只有一条弦加上一个黑洞——理论上有可能创建一系列闭合的时间曲线。你最好的办法是发射两条无限长的宇宙弦，以非常高的速度穿过彼此，然后以仔细计算的8字形绕它们飞行。理论上，你可以随时随地出现！然而，这些都是纯粹的理论对象，没有实验观察到它的存在。
宇宙弦是宇宙形成后时空结构中的一种假设的一维（空间）拓扑缺陷。一些科学家建议使用宇宙弦来构建时间机器。通过操纵两条宇宙弦靠近——或者可能只有一条弦加上一个黑洞——理论上有可能创建一系列闭合的时间曲线。你最好的办法是发射两条无限长的宇宙弦，以非常高的速度穿过彼此，然后以仔细计算的8字形绕它们飞行。理论上，你可以随时随地出现！然而，这些都是纯粹的理论对象，没有实验观察到它的存在。
Time-warped Fields use energy within curvatures of spacetime surrounding a rotating mass or energy field to generate containable and controllable fields of closed-timelike curves that can move matter and information forward or backward in time. Even the smallest twist in spacetime contains enormous energy potential and can be used to create containable and controllable fields of close-timelike curves without the need for significant input power. This makes both forward and reverse time control possible.
时间扭曲场利用围绕旋转质量或能量场的时空曲率内的能量，产生封闭的类时间曲线的可控制和可控制的场，这些曲线可以在时间上向前或向后移动物质和信息。即使是时空中最小的扭曲也包含巨大的能量势能，并且可以用来创建封闭的、可控的、类似时间的曲线场，而不需要显著的输入功率。这使得正向和反向时间控制成为可能。
时间扭曲场利用围绕旋转质量或能量场的时空曲率内的能量，产生封闭的类时间曲线的可控制和可控制的场，这些曲线可以在时间上向前或向后移动物质和信息。即使是时空中最小的扭曲也包含巨大的能量势能，并且可以用来创建封闭的、可控的、类似时间的曲线场，而不需要显著的输入功率。这使得正向和反向时间控制成为可能。
Niranjan Daithankar
Time travel is a topic of great interest and excitement today.
Time travel to the future is certainly possible, and it is even proved by scientists using sub-atomic particles. Also, travel to the future is consistent with Einstein's theory of relativity, which states that time always travels in only one direction, and that is forward. Travelling into the future, hence, does not violate any laws of physics. Any observer in a non-inertial frx of reference upon attaining speed, experiences that time is elapsing slower compared to a stationary observer. The more speed is attained, the more is the dilation in time, causing the observer to travel into the future. Furthermore, gravity of a Black Hole can be strong enough to freeze the elapsing time due to the distortion of space-time it causes, making an observer going through such an intense gravity to travel into the future.
时间旅行是今天人们非常感兴趣和兴奋的一个话题。
到未来的时间旅行当然是可能的，它甚至被科学家用亚原子粒子证明了。而且，到未来的旅行与爱因斯坦的相对论是一致的，该理论指出，时间总是只在一个方向上旅行，那就是向前。因此，穿越到未来并不违反任何物理学定律。任何在非惯性参照系中的观察者在获得速度后，都会体验到与静止的观察者相比，时间流逝得更慢。达到的速度越快，时间的扩张就越大，导致观察者穿越到未来。此外，由于黑洞造成的时空扭曲，它的引力可以强大到足以冻结正在流逝的时间，使观察者在经历如此强烈的引力时，会穿越到未来。
Time travel is a topic of great interest and excitement today.
Time travel to the future is certainly possible, and it is even proved by scientists using sub-atomic particles. Also, travel to the future is consistent with Einstein's theory of relativity, which states that time always travels in only one direction, and that is forward. Travelling into the future, hence, does not violate any laws of physics. Any observer in a non-inertial frx of reference upon attaining speed, experiences that time is elapsing slower compared to a stationary observer. The more speed is attained, the more is the dilation in time, causing the observer to travel into the future. Furthermore, gravity of a Black Hole can be strong enough to freeze the elapsing time due to the distortion of space-time it causes, making an observer going through such an intense gravity to travel into the future.
时间旅行是今天人们非常感兴趣和兴奋的一个话题。
到未来的时间旅行当然是可能的，它甚至被科学家用亚原子粒子证明了。而且，到未来的旅行与爱因斯坦的相对论是一致的，该理论指出，时间总是只在一个方向上旅行，那就是向前。因此，穿越到未来并不违反任何物理学定律。任何在非惯性参照系中的观察者在获得速度后，都会体验到与静止的观察者相比，时间流逝得更慢。达到的速度越快，时间的扩张就越大，导致观察者穿越到未来。此外，由于黑洞造成的时空扭曲，它的引力可以强大到足以冻结正在流逝的时间，使观察者在经历如此强烈的引力时，会穿越到未来。
Time travel into the past is a whole different story. It just seems that it's not possible to travel into the past, because time flows forward, and not backward. Furthermore, travel into the past violates the law of causality, which states that an effect is always preceded by a cause. There cannot be an effect without a cause, and that the events in nature are long and unending chains of causes and effects. For example, travelling into the past means that you remember the future! Also as an example, consider that a murderer has planned to shoot a person. But the victim dies before getting shot by the murderer! This is an inconsistency, isn't it?
时间旅行到过去是一个完全不同的故事。只是，似乎不可能穿越到过去，因为时间是向前流动的，而不是向后。此外，穿越到过去违反了因果律，即一个结果总是先于一个原因。没有原因就不可能有结果，自然界的事件是漫长而无止境的因果关系链。例如，穿越到过去就意味着你记住了未来！这就是因果关系！同样作为一个例子，考虑到一个杀人犯已经计划要枪杀一个人。但是受害者在被凶手枪杀之前就已经死了！这是一个不一致的现象，对吗？
时间旅行到过去是一个完全不同的故事。只是，似乎不可能穿越到过去，因为时间是向前流动的，而不是向后。此外，穿越到过去违反了因果律，即一个结果总是先于一个原因。没有原因就不可能有结果，自然界的事件是漫长而无止境的因果关系链。例如，穿越到过去就意味着你记住了未来！这就是因果关系！同样作为一个例子，考虑到一个杀人犯已经计划要枪杀一个人。但是受害者在被凶手枪杀之前就已经死了！这是一个不一致的现象，对吗？
Due to this reason, time travel into the past is often discarded as impossible. However, this is not the end of discussion. We say that attaining speed makes you travel to the future, and as the speed goes near to the speed of light, the observer is travelling into future considerably fast. When the speed is equal to the speed of light, the time halts and you are literally flying your way into the future. So what happens when you are travelling FASTER than light?
由于这个原因，进入过去的时间旅行往往被视为不可能。然而，这并不是讨论的终点。我们说，达到一定的速度会让你前往未来，当速度接近光速时，观察者就会相当快地前往未来。当速度等于光速时，时间就停止了，你就真的飞到了未来。那么，当你以比光速更快的速度旅行时会发生什么呢？
由于这个原因，进入过去的时间旅行往往被视为不可能。然而，这并不是讨论的终点。我们说，达到一定的速度会让你前往未来，当速度接近光速时，观察者就会相当快地前往未来。当速度等于光速时，时间就停止了，你就真的飞到了未来。那么，当你以比光速更快的速度旅行时会发生什么呢？
Theoretically, it should mean that time starts going backwards! So when you are travelling FASTER than light, you just might be travelling into the past. But it's not possible to travel faster than light. Even if you attain the speed of light, your relative mass should have become infinite, and at such a mass it will be impossible for you to attain any more speed. So this idea is very theoretical. But is there something in this Universe that can make this possible?
There might be. Time will tell. Kerr Black Holes are proposed and existence of White Holes may be proved in the future. There are some crazy ideas regarding these two....
从理论上讲，这应该意味着时间开始倒流! 因此，当你以比光速更快的速度旅行时，你可能只是旅行到了过去。但是不可能比光速更快。即使你达到了光速，你的相对质量也应该变得无限大，在这样的质量下，你不可能再达到任何速度。所以这个想法是非常理论性的。但是在这个宇宙中是否有什么东西可以使之成为可能？
也许有。时间会告诉我们。克尔黑洞被提出来了，白洞的存在可能在未来被证明。关于这两个....，有一些疯狂的想法。
There might be. Time will tell. Kerr Black Holes are proposed and existence of White Holes may be proved in the future. There are some crazy ideas regarding these two....
从理论上讲，这应该意味着时间开始倒流! 因此，当你以比光速更快的速度旅行时，你可能只是旅行到了过去。但是不可能比光速更快。即使你达到了光速，你的相对质量也应该变得无限大，在这样的质量下，你不可能再达到任何速度。所以这个想法是非常理论性的。但是在这个宇宙中是否有什么东西可以使之成为可能？
也许有。时间会告诉我们。克尔黑洞被提出来了，白洞的存在可能在未来被证明。关于这两个....，有一些疯狂的想法。
Joshua Engel
Well, at a quantum level, it happens all the time. It's extremely limited, and when you put a lot of quantum events together, they behave like plain old ordinary cause and effect.
嗯，在量子水平上，它一直在发生。它是极其有限的，当你把大量的量子事件放在一起时，它们的行为就像普通的因果关系。
原创翻译：龙腾网 https://www.ltaaa.cn 转载请注明出处
Well, at a quantum level, it happens all the time. It's extremely limited, and when you put a lot of quantum events together, they behave like plain old ordinary cause and effect.
嗯，在量子水平上，它一直在发生。它是极其有限的，当你把大量的量子事件放在一起时，它们的行为就像普通的因果关系。
原创翻译：龙腾网 https://www.ltaaa.cn 转载请注明出处
There are various attempts to solve the equations in string theory and other unified theories that lead to time travel on a scale larger than the quantum scale. Such things always involve ultra-dense forms of matter (black holes, superstrings) that make time behave in unexpected ways through relativity. These theories lead to infinities, and if you normalize the equations just the right way, you can get time travel. Time travel leads very directly to infinities: they imply traveling faster than the speed of light, which causes key factors like gamma (1/sqrt(1-v^2/c^2) to go to infinity, or imaginary numbers.
有各种尝试来解决弦理论和其他统一理论中的方程，导致在比量子尺度更大的范围内进行时间旅行。这样的事情总是涉及超密集的物质形式（黑洞、超弦），通过相对论使时间以意想不到的方式表现出来。这些理论导致了无限性，如果你以正确的方式使方程正常化，你就可以得到时间旅行。时间旅行非常直接地导致了无限性：它们意味着旅行速度超过了光速，这导致伽马（1/sqrt(1-v^2/c^2)）等关键因素走向无限，或虚数。
原创翻译：龙腾网 https://www.ltaaa.cn 转载请注明出处
有各种尝试来解决弦理论和其他统一理论中的方程，导致在比量子尺度更大的范围内进行时间旅行。这样的事情总是涉及超密集的物质形式（黑洞、超弦），通过相对论使时间以意想不到的方式表现出来。这些理论导致了无限性，如果你以正确的方式使方程正常化，你就可以得到时间旅行。时间旅行非常直接地导致了无限性：它们意味着旅行速度超过了光速，这导致伽马（1/sqrt(1-v^2/c^2)）等关键因素走向无限，或虚数。
原创翻译：龙腾网 https://www.ltaaa.cn 转载请注明出处
My personal opinion is that this illustrates difficulties with the equations, and with the whole idea of using mathematics to model the universe, rather than real possibilities for time travel. Infinities are easy ways to prove anything you want, like this proof that 1=2:
我个人认为，这说明了方程的困难，以及用数学来模拟宇宙的整个想法，而不是时间旅行的真实可能性。无穷大是证明任何你想要的东西的简单方法，比如这个1=2的证明：
我个人认为，这说明了方程的困难，以及用数学来模拟宇宙的整个想法，而不是时间旅行的真实可能性。无穷大是证明任何你想要的东西的简单方法，比如这个1=2的证明：
http://www.math.toronto.edu/mathnet/falseProofs/first1eq2.html
Quantum mechanics and general relativity have already dramatically altered our understand of time, without explaining the one-way nature of it. So it's very dangerous to rely on one's intuitive notion of time. But I suspect that when we do manage to unravel the difficulties and create a truly unified theory, one thing that will drop out of it is a proof that time travel will always be restricted to quantum scales.
量子力学和广义相对论已经极大地改变了我们对时间的理解，而没有解释它的单向性质。因此，依靠一个人对时间的直觉概念是非常危险的。但我怀疑，当我们确实设法解开困难并创建一个真正的统一理论时，其中会有一件事被放弃，那就是证明时间旅行将永远被限制在量子尺度上。
Quantum mechanics and general relativity have already dramatically altered our understand of time, without explaining the one-way nature of it. So it's very dangerous to rely on one's intuitive notion of time. But I suspect that when we do manage to unravel the difficulties and create a truly unified theory, one thing that will drop out of it is a proof that time travel will always be restricted to quantum scales.
量子力学和广义相对论已经极大地改变了我们对时间的理解，而没有解释它的单向性质。因此，依靠一个人对时间的直觉概念是非常危险的。但我怀疑，当我们确实设法解开困难并创建一个真正的统一理论时，其中会有一件事被放弃，那就是证明时间旅行将永远被限制在量子尺度上。
At the very least... even the most optimistic readings of the equations seem to make it impossible that any obxt larger than the atomic scale could survive the immense forces required to go there. That could be used for sending messages back in time, but even then, I'm skeptical that it could be done in practice.
For further reading, I think that this classic series of essays by physicist John Gribbin is a good place to start
至少......即使是对方程式最乐观的解读，也似乎使任何大于原子尺度的物体不可能在去那里所需的巨大力量下生存。这可以用于及时发送信息，但即使如此，我也怀疑它是否可以在实践中做到。对于进一步的阅读，我认为物理学家约翰-格里宾的这一系列经典文章是一个好的开始
For further reading, I think that this classic series of essays by physicist John Gribbin is a good place to start
至少......即使是对方程式最乐观的解读，也似乎使任何大于原子尺度的物体不可能在去那里所需的巨大力量下生存。这可以用于及时发送信息，但即使如此，我也怀疑它是否可以在实践中做到。对于进一步的阅读，我认为物理学家约翰-格里宾的这一系列经典文章是一个好的开始
Arun Mishra
Everything seems to suggest that we can't, but I won't play the spoil sport, and there are certain ways in which it might be possible, it is certainly possible in principle.
General relativity suggests that Spacetime is connected or weaved into each other, so if I can start a Point A make a complete circle and return to the same point A in space, I should be able to do the same in time. Start at some point and then return to it.
一切似乎都表明我们不能，但我不会玩破坏性的游戏，而且有一些可能的方式，它在原则上肯定是可能的。
广义相对论表明，时空是相互连接或交织在一起的，因此，如果我可以从A点开始绕一个完整的圆圈，并返回空间中的同一个A点，我应该可以在时间上做同样的事情。从某个点开始，然后返回到它。
原创翻译：龙腾网 https://www.ltaaa.cn 转载请注明出处
Everything seems to suggest that we can't, but I won't play the spoil sport, and there are certain ways in which it might be possible, it is certainly possible in principle.
General relativity suggests that Spacetime is connected or weaved into each other, so if I can start a Point A make a complete circle and return to the same point A in space, I should be able to do the same in time. Start at some point and then return to it.
一切似乎都表明我们不能，但我不会玩破坏性的游戏，而且有一些可能的方式，它在原则上肯定是可能的。
广义相对论表明，时空是相互连接或交织在一起的，因此，如果我可以从A点开始绕一个完整的圆圈，并返回空间中的同一个A点，我应该可以在时间上做同样的事情。从某个点开始，然后返回到它。
原创翻译：龙腾网 https://www.ltaaa.cn 转载请注明出处
Mathematically it seems possible, but mathematics is not Physics, it seems highly unlikely that we would be able to do that without disrupting Causality.
Now, let's see how we can achieve this -:
You are well versed with the concept of black holes time dilation and what happens when we reach close to the speed of light, they are rather boring ways of time travel, I am assuming you are looking for something more instantaneous like they show in movies.
在数学上，这似乎是可能的，但数学不是物理学，我们似乎极不可能在不破坏因果关系的情况下做到这一点。
现在，让我们看看我们如何能够实现这一点--：
你很熟悉黑洞时间膨胀的概念，以及当我们达到接近光速时发生的事情，它们是相当无聊的时间旅行方式，我假设你正在寻找像电影中展示的那样更瞬时的东西。
Now, let's see how we can achieve this -:
You are well versed with the concept of black holes time dilation and what happens when we reach close to the speed of light, they are rather boring ways of time travel, I am assuming you are looking for something more instantaneous like they show in movies.
在数学上，这似乎是可能的，但数学不是物理学，我们似乎极不可能在不破坏因果关系的情况下做到这一点。
现在，让我们看看我们如何能够实现这一点--：
你很熟悉黑洞时间膨胀的概念，以及当我们达到接近光速时发生的事情，它们是相当无聊的时间旅行方式，我假设你正在寻找像电影中展示的那样更瞬时的东西。
How about a wormhole?
Before you rule me out as crazy, let me tell you that there is more to a wormhole than just connecting two points in space, it can also be used for travelling through time. Rather than connecting two different spaces in time let's say one point on some habitable planet in Andromeda galaxy, and one here on Earth. This would mean we could rapidly travel light years of distance in a second.
虫洞怎么样？
在你认为我疯了之前，让我告诉你，虫洞不仅仅是连接空间中的两个点，它还可以用于穿越时间。与其说连接两个不同的时间空间，不如说一个点在仙女座星系的某个宜居星球上，一个点在地球上。这将意味着我们可以在一秒钟内迅速穿越光年的距离。
Before you rule me out as crazy, let me tell you that there is more to a wormhole than just connecting two points in space, it can also be used for travelling through time. Rather than connecting two different spaces in time let's say one point on some habitable planet in Andromeda galaxy, and one here on Earth. This would mean we could rapidly travel light years of distance in a second.
虫洞怎么样？
在你认为我疯了之前，让我告诉你，虫洞不仅仅是连接空间中的两个点，它还可以用于穿越时间。与其说连接两个不同的时间空间，不如说一个点在仙女座星系的某个宜居星球上，一个点在地球上。这将意味着我们可以在一秒钟内迅速穿越光年的距离。
Remember how I told you that in general relativity space and time are weaved together, now imagine the same wormhole, but rather than connecting two points in space, it would connect two points in time, say earth 2116 and earth 2016.
Off course, wormholes that big to carry a spaceship, or a human is almost impossible to create. It would be destroyed by radiation. They might appear and disappear at plank length, but to make one big enough to pass through is not very likely.
还记得我是如何告诉你，在广义相对论中，空间和时间是交织在一起的，现在想象一下同样的虫洞，但它不是连接空间中的两个点，而是连接时间中的两个点，比如2116年的地球和2016年的地球。
当然，那么大的虫洞可以承载一艘宇宙飞船，或者一个人，几乎是不可能创造的。它将被辐射摧毁。它们可能会在木板的长度上出现和消失，但要制造一个大到足以通过的虫洞，可能性不大。
Off course, wormholes that big to carry a spaceship, or a human is almost impossible to create. It would be destroyed by radiation. They might appear and disappear at plank length, but to make one big enough to pass through is not very likely.
还记得我是如何告诉你，在广义相对论中，空间和时间是交织在一起的，现在想象一下同样的虫洞，但它不是连接空间中的两个点，而是连接时间中的两个点，比如2116年的地球和2016年的地球。
当然，那么大的虫洞可以承载一艘宇宙飞船，或者一个人，几乎是不可能创造的。它将被辐射摧毁。它们可能会在木板的长度上出现和消失，但要制造一个大到足以通过的虫洞，可能性不大。
However, it has been suggested, and I quote from the wikipedia article-:
It has also been proposed that, if a tiny wormhole held open by a negative mass cosmic string had appeared around the time of the Big Bang, it could have been inflated to macroscopic size by cosmic inflation
So if we are lucky, there might be a wormhole in our observable universe that we just need to find and use it to surprise our child self.
然而，有人建议，我引用维基百科上的文章--：
也有人提出，如果在宇宙大爆炸前后出现了一个由负质量的宇宙弦撑开的微小虫洞，那么它可能会被宇宙膨胀膨胀到宏观大小。
因此，如果我们幸运的话，在我们可观察到的宇宙中可能有一个虫洞，我们只需要找到并利用它来给孩子的自己一个惊喜。
It has also been proposed that, if a tiny wormhole held open by a negative mass cosmic string had appeared around the time of the Big Bang, it could have been inflated to macroscopic size by cosmic inflation
So if we are lucky, there might be a wormhole in our observable universe that we just need to find and use it to surprise our child self.
然而，有人建议，我引用维基百科上的文章--：
也有人提出，如果在宇宙大爆炸前后出现了一个由负质量的宇宙弦撑开的微小虫洞，那么它可能会被宇宙膨胀膨胀到宏观大小。
因此，如果我们幸运的话，在我们可观察到的宇宙中可能有一个虫洞，我们只需要找到并利用它来给孩子的自己一个惊喜。
The problem of causality still is a big challenge, we know what we have as options, but then there are rules of physics that could never be broken. Maybe, we might travel in time but in a different universe (assuming multiverse exists). That way we will be able to travel back in time, without breaking any rules. We might not be able to meet our younger self or our Grandpa, but it would be a different version of history all together, one in which our lineage might not exist, maybe humans might not exist, and dinosaurs ride on spaceships, who knows?
因果关系的问题仍然是一个很大的挑战，我们知道我们有哪些选择，但有一些物理学规则是永远不能被打破的。也许，我们可以在不同的宇宙中进行时间旅行（假设多元宇宙存在）。这样，我们就能在不违反任何规则的情况下回到过去。我们可能无法见到年轻的自己或爷爷，但这将是一个完全不同的历史版本，其中我们的血统可能不存在，也许人类可能不存在，而恐龙骑在宇宙飞船上，谁知道？
因果关系的问题仍然是一个很大的挑战，我们知道我们有哪些选择，但有一些物理学规则是永远不能被打破的。也许，我们可以在不同的宇宙中进行时间旅行（假设多元宇宙存在）。这样，我们就能在不违反任何规则的情况下回到过去。我们可能无法见到年轻的自己或爷爷，但这将是一个完全不同的历史版本，其中我们的血统可能不存在，也许人类可能不存在，而恐龙骑在宇宙飞船上，谁知道？
Easier option
Find Tachyon
A tachyon or tachyonic particle is a hypothetical particle that always moves faster than light. Most physicists believe that faster-than-light particles cannot exist because they are not consistent with the known laws of physics.
If such particles did exist, they could be used to build a tachyonic antitelephone and send signals faster than light, which (according to special relativity) would lead to violations of causality.
Their discovery could change the world, and the way we view physics. Needless to say that since they would lead to violations of causality, and as my limited understanding goes, this could be applied to travel back in time.
更简单的选择
寻找超音速粒子
超光子或超音速粒子是一种假设的粒子，其运动速度总是超过光速。大多数物理学家认为，超过光速的粒子不可能存在，因为它们不符合已知的物理定律。
如果这种粒子确实存在，它们可以被用来建立一个超速反电波电话，并发送比光速更快的信号，（根据狭义相对论）这将导致违反因果关系。
它们的发现可能会改变世界，以及我们看待物理学的方式。不用说，既然它们会导致违反因果关系，而且根据我有限的理解，这可能会被应用于穿越时空。
Find Tachyon
A tachyon or tachyonic particle is a hypothetical particle that always moves faster than light. Most physicists believe that faster-than-light particles cannot exist because they are not consistent with the known laws of physics.
If such particles did exist, they could be used to build a tachyonic antitelephone and send signals faster than light, which (according to special relativity) would lead to violations of causality.
Their discovery could change the world, and the way we view physics. Needless to say that since they would lead to violations of causality, and as my limited understanding goes, this could be applied to travel back in time.
更简单的选择
寻找超音速粒子
超光子或超音速粒子是一种假设的粒子，其运动速度总是超过光速。大多数物理学家认为，超过光速的粒子不可能存在，因为它们不符合已知的物理定律。
如果这种粒子确实存在，它们可以被用来建立一个超速反电波电话，并发送比光速更快的信号，（根据狭义相对论）这将导致违反因果关系。
它们的发现可能会改变世界，以及我们看待物理学的方式。不用说，既然它们会导致违反因果关系，而且根据我有限的理解，这可能会被应用于穿越时空。
And how will we apply them- I have no Idea, how?
Maybe something like a flux capacitor from the movie "Back To the Future", and make a nice time traveling car.
Tachyonic particle powered Flux capacitor seems like a cool idea.
Now just install this in your car, and maybe you would be able to travel through space and time, that is off course if you find these particles first.
我们将如何应用它们--我不知道，如何应用？
也许像电影 "回到未来 "中的通量电容器一样，制造一辆漂亮的时间旅行车。
超光速粒子驱动的通量电容器似乎是一个很酷的想法。
现在只要把它安装在你的车上，也许你就能穿越空间和时间，当然，如果你先找到这些粒子的话。
Maybe something like a flux capacitor from the movie "Back To the Future", and make a nice time traveling car.
Tachyonic particle powered Flux capacitor seems like a cool idea.
Now just install this in your car, and maybe you would be able to travel through space and time, that is off course if you find these particles first.
我们将如何应用它们--我不知道，如何应用？
也许像电影 "回到未来 "中的通量电容器一样，制造一辆漂亮的时间旅行车。
超光速粒子驱动的通量电容器似乎是一个很酷的想法。
现在只要把它安装在你的车上，也许你就能穿越空间和时间，当然，如果你先找到这些粒子的话。
Ganesh Subramaniam
The straight answer is NO - according to me. This is my favourite subject! Let me explain.
Scientists have given more attention to the measurement of time than anything else in nature, but even so, time remains in total abstraction, a riddle that exists only in our minds.
Actually, there are several definitions of TIME. The most common one is that ‘Time is the interval between two events.’ The one I like most is “Time is nature’s way of avoiding everything from happening all at once!”. In fact, if you ask ten people to define time, you may get ten definitions.
直接的答案是 "不"--据我所知。这是我最喜欢的话题! 让我解释一下。
科学家们对时间的测量给予了比自然界其他事物更多的关注，但即便如此，时间仍然是完全抽象的，是一个只存在于我们头脑中的谜题。
实际上，时间有几个定义。最常见的一个是，"时间是两个事件之间的间隔"。我最喜欢的一个是："时间是大自然避免所有事情同时发生的方式！"。事实上，如果你问十个人定义时间，你可能会得到十个定义。
The straight answer is NO - according to me. This is my favourite subject! Let me explain.
Scientists have given more attention to the measurement of time than anything else in nature, but even so, time remains in total abstraction, a riddle that exists only in our minds.
Actually, there are several definitions of TIME. The most common one is that ‘Time is the interval between two events.’ The one I like most is “Time is nature’s way of avoiding everything from happening all at once!”. In fact, if you ask ten people to define time, you may get ten definitions.
直接的答案是 "不"--据我所知。这是我最喜欢的话题! 让我解释一下。
科学家们对时间的测量给予了比自然界其他事物更多的关注，但即便如此，时间仍然是完全抽象的，是一个只存在于我们头脑中的谜题。
实际上，时间有几个定义。最常见的一个是，"时间是两个事件之间的间隔"。我最喜欢的一个是："时间是大自然避免所有事情同时发生的方式！"。事实上，如果你问十个人定义时间，你可能会得到十个定义。
To a clockmaker, it is the “tick-tock” of his products. A science fiction addict would say it is the fourth dimension. A biologist might see time in the internal/circadian clocks that keep living beings synchronized with nature. For a banker or a businessman, “Time is money”. A scientist may say that time is one of the two basic building blocks of the universe, the other being space.
对一个钟表匠来说，它是他产品的 "滴答 "声。一个科幻小说家会说它是第四维。一个生物学家可能会在保持生物与自然同步的内部/昼夜节律的时钟中看到时间。对于一个银行家或商人来说，"时间就是金钱"。一个科学家可能会说，时间是宇宙的两个基本组成部分之一，另一个是空间。
对一个钟表匠来说，它是他产品的 "滴答 "声。一个科幻小说家会说它是第四维。一个生物学家可能会在保持生物与自然同步的内部/昼夜节律的时钟中看到时间。对于一个银行家或商人来说，"时间就是金钱"。一个科学家可能会说，时间是宇宙的两个基本组成部分之一，另一个是空间。
According to me, TIME as we know it, is only a concept, and has evolved along with our vocabulary or language. Living in the frx of past- happenings, and having lifetimes and reminiscing, and thinking of the future, are all abilities acquired when our vocabulary or language advanced to a point where we could describe the past in terms of personal experiences and the future in terms of our hopes and expectations – either vocally or mentally. This is a profound insight I got when I was thinking about "time" one day. If I do not have a memory bank – however large or small – what is time to me? True enough, I learnt later that children/infants and animals do not have a concept of time!
根据我的观点，我们所知道的 "时间 "只是一个概念，它是随着我们的词汇或语言而演变的。生活在过去发生的框架中，有生之年和回忆，以及对未来的思考，都是在我们的词汇或语言发展到可以用个人经历来描述过去，用我们的希望和期待来描述未来时获得的能力--无论是声音还是精神。这是我有一天在思考 "时间 "问题时得到的深刻见解。如果我没有一个记忆库--无论多么大或多么小--那么时间对我来说是什么？诚然，我后来了解到，儿童/婴儿和动物没有时间的概念！这就是我的深刻见解！
根据我的观点，我们所知道的 "时间 "只是一个概念，它是随着我们的词汇或语言而演变的。生活在过去发生的框架中，有生之年和回忆，以及对未来的思考，都是在我们的词汇或语言发展到可以用个人经历来描述过去，用我们的希望和期待来描述未来时获得的能力--无论是声音还是精神。这是我有一天在思考 "时间 "问题时得到的深刻见解。如果我没有一个记忆库--无论多么大或多么小--那么时间对我来说是什么？诚然，我后来了解到，儿童/婴儿和动物没有时间的概念！这就是我的深刻见解！
In physics, spacetime (also space–time continuum) is any mathematical model that combines space and time into a single interwoven continuum.
The spacetime of our universe is usually interpreted from a Euclidean space perspective, which regards space as consisting of three dimensions, and time as consisting of one dimension, the "fourth dimension". By combining space and time into a single manifold called "Minkowski space", physicists have significantly simplified a large number of physical theories, as well as described in a more uniform way the workings of the universe at both the super-galactic and subatomic levels.
在物理学中，时空（也是时空连续体）是任何将空间和时间结合成一个交织的连续体的数学模型。
我们宇宙的时空通常是从欧几里得空间的角度来解释的，它认为空间由三维组成，而时间由一维组成，即 "第四维"。通过将空间和时间结合成一个被称为 "闵可夫斯基空间 "的单一流形，物理学家大大简化了大量的物理理论，并以更统一的方式描述了宇宙在超银河系和亚原子层面的运作。
The spacetime of our universe is usually interpreted from a Euclidean space perspective, which regards space as consisting of three dimensions, and time as consisting of one dimension, the "fourth dimension". By combining space and time into a single manifold called "Minkowski space", physicists have significantly simplified a large number of physical theories, as well as described in a more uniform way the workings of the universe at both the super-galactic and subatomic levels.
在物理学中，时空（也是时空连续体）是任何将空间和时间结合成一个交织的连续体的数学模型。
我们宇宙的时空通常是从欧几里得空间的角度来解释的，它认为空间由三维组成，而时间由一维组成，即 "第四维"。通过将空间和时间结合成一个被称为 "闵可夫斯基空间 "的单一流形，物理学家大大简化了大量的物理理论，并以更统一的方式描述了宇宙在超银河系和亚原子层面的运作。
Logically therefore, when we travel in space, (not necessarily outer-space)
we are traveling in time too.
The time "travel" we read about in fiction and watch in movies is only a figment of imagination. The past and the future are only in our minds - the former as a memory and the latter as a hope; what we have is only the PRESENT MOMENT - which is just a thin line between the concepts of our past and our future!
With the level of knowledge available today, no-one can travel in time and be physically present in the "past" or the "future".
因此，从逻辑上讲，当我们在太空旅行时，（不一定是在外太空）
我们也在时间上旅行。
我们在小说中读到的和在电影中看到的时间“旅行”只是想象的虚构。过去和未来只在我们的脑海中——前者是记忆，后者是希望；我们所拥有的只是当下——这只是我们过去和未来概念之间的一条细线！
以今天的知识水平，没有人能在时间上旅行，也没有人能实际存在于“过去”或“未来”。
we are traveling in time too.
The time "travel" we read about in fiction and watch in movies is only a figment of imagination. The past and the future are only in our minds - the former as a memory and the latter as a hope; what we have is only the PRESENT MOMENT - which is just a thin line between the concepts of our past and our future!
With the level of knowledge available today, no-one can travel in time and be physically present in the "past" or the "future".
因此，从逻辑上讲，当我们在太空旅行时，（不一定是在外太空）
我们也在时间上旅行。
我们在小说中读到的和在电影中看到的时间“旅行”只是想象的虚构。过去和未来只在我们的脑海中——前者是记忆，后者是希望；我们所拥有的只是当下——这只是我们过去和未来概念之间的一条细线！
以今天的知识水平，没有人能在时间上旅行，也没有人能实际存在于“过去”或“未来”。
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