霍金的时间派对为什么被放鸽子

霍金，英国剑桥大学著名物理学家，现代最伟大的物理学家之一、20世纪享有国际盛誉的伟人之一。霍金曾经做过一个有趣的小实验，那就是办了一场时间旅行者的派对。2009年6月28日，著名物理学家史蒂芬霍金举行了一场派对，只邀请时间旅行者参加，为了确保参加的人都是时间旅行者，霍金在派对结束之后才寄出的请柬，并写明具体的日期，但是遗憾的是，这次派对并没有人来参加，就连冒充时间旅行者的人都没有。

结果是相当的令人失望，可为什么没有人来参加此次的时间旅行派对呢？这里有几种可能的解释：

一、祖母悖论不允许时间穿越

祖母悖论，这条悖论简单的来说就是一位时间旅行者穿越回过去杀害了他的祖母，可这样就产生了自相矛盾的结果，如果他杀了他的父母，那他注定就不会来到这世上，那么又是谁杀害他的祖母呢？这一个悖论直接说明了两种结果，一是这位时间旅行者，无论如何都伤害不了他的祖母，或者说是她的祖母，无论如何都会幸存下来，二是说明时间旅行，穿越过去的时间线并不可行。也就是说想要参加或者举办的时间，旅行者派对的人，要么是因为理论原因无法穿越回过去的时间线，要么就是因为种种原因，比如搞错时间和地点，最终错过霍金的时间旅行者派对。

二、时间跨度过大，信息未有效传达

第二种可能性就较为简单，可能是因为霍金发出派对请柬，距离人们发明时间旅行机器的时间跨度过大，未来的人们并未得到这场派对的信息，也或许在未来霍金的名气并不是很大，知道霍金的人少之又少，就自然不会有时间旅行者来参加派对。

三、想参加却不能参加

在很远的未来，人们可能已经实现了时间旅行，但时间旅行的价格非常昂贵，只能用作科研目的，而参加霍金的时间旅行者派对显然对于未来的人没有太大意义，因而也被限制在内，不能参加。并且时间旅行有着非常多限制，就比如不接触原则，对于历史上已发生的事，只能见证，不能参与或进行改变，不能同过去的人进行接触、交流或者行为影响。

时间旅行一直为人们所憧憬，人类也一直在用各种方式从技术上、理论上证明时间旅行可行。但如果你穿越回了过去，那么那个过去就将成为你的未来，而你的现在也就成了你的过去，从这一点上来说，回到过去也是自相矛盾的。但不管怎么说，人类对于时间旅行的念想不会改变，毕竟谁不想回到过去，去怀念或是改变以往的事呢？

Today's article

Hawking, a well-known physicist at Cambridge University in England, one of the greatest modern physicists, and one of the great men with international reputation in the 20th century. Hawking once did an interesting little experiment, that is, to organize a time traveler party. On June 28, 2009, the famous physicist Stephen Hawking held a party in which only time travellers were invited. In order to ensure that all participants were time travellers, Hawking sent invitations after the party and wrote The specific date was given, but unfortunately, no one came to the party, not even anyone posing as a time traveler.

The result was quite disappointing, but why didn't anyone come to this time travel party? There are several possible explanations:

1. The grandmother's paradox does not allow time to travel

The grandmother's paradox. Simply put, this paradox is that a time traveler traveled back to the past and killed his grandmother, but this produced a contradictory result. If she killed his parents, he was destined to be Won't come to this world, so who killed his grandmother? This paradox directly illustrates two results. One is that this time traveler can't hurt his grandmother in any way, or her grandmother will survive no matter what, and the other is that time travel, crossing the past. The timeline is not feasible. In other words, people who want to attend or hold a traveler party are either unable to travel back to the past timeline for theoretical reasons, or for various reasons, such as misunderstanding the time and place, and eventually miss Hawking’s time traveler Party.

2. The time span is too long and the

party information is not effectively communicated

The second possibility is simpler. It may be because Hawking gave out party invitations, and it was too long before people invented the time travel machine. People in the future did not get the information about this party, or maybe Hawking’s reputation in the future is not It's big, and there are few people who know Hawking, so naturally there will be no time for travelers to come to the party.

3. Want to participate but cannot participate

In the far future, people may have achieved time travel, but time travel is very expensive and can only be used for scientific research purposes. It is obvious that participating in Hawking’s time traveler party does not make much sense for future people, so it is also It is restricted and cannot participate. And time travel has many restrictions, such as the non-contact principle. For things that have happened in history, you can only witness, you cannot participate in or change, and you cannot contact, communicate or influence behavior with people in the past.

Time travel has always been longed for by people, and humans have been using various methods to prove that time travel is technically and theoretically feasible. But if you travel back to the past, then that past will become your future, and your present will become your past. From this point of view, going back to the past is also contradictory. But in any case, mankind's thinking about time travel will not change. After all, who doesn't want to go back to the past, miss or change the past?

翻译来源：Google翻译

参考资料：百度百科