To be honest, this is indeed a question that Lin Zixuan is more interested in.

In later life, he enjoyed watching science fiction movies, including many about time travel. Especially the very famous "Interstellar", but he just watched it lively, and he didn't understand those esoteric scientific theories.

Many later scientists believed that time travel was theoretically possible.

For this reason, some people have proposed the idea of four-dimensional space, adding time to the dimension, and believe that the natural "vehicle" of time travel is a black hole.

These conjectures about time travel are derived from Einstein's theory of relativity.

In Newton's view, the river of time is straight, continuous, and consistent, it never deviates, and always passes at the same speed, in its own way, with all things in the world.

Later, Einstein argued that time "is not so stable, and that the long river of time meanders and accelerates or slows down around stars and galaxies."

In 1949, Einstein's colleague at Princeton, the logician Kurt Gödel, found a solution to Einstein's equations of general relativity, which described the universe as rotating.

If the universe really rotates, then when you go around the universe on a rocket, you will return before you set off.

This discovery puzzled Einstein.

In Einstein's memoirs, he acknowledged that it was indeed the solution of his equations, but he also thought that we could physically discard them because the universe was expanding, not rotating.

In 1963, mathematician Royker discovered that a rotating black hole collapses into a ring of compressed matter instead of a point.

If you pass through the middle of this ring, you may experience a time rewind or even travel to another universe.

Mathematicians call this kind of space "multi-connected space", and physicists call it wormholes.

By the late '80s, Caltech physicist Kipsohn and his colleagues had discovered another set of solutions to Einstein's equations that showed that wormholes could be traversed.

In the 1990s, Edward Witton proposed an M theory with an 11-degree space.

He and other scholars found strong evidence that many of the different versions of superstring theory at the time were actually the result of different limit settings for M-theory, and these discoveries led to the second innovation in superstring theory.

String theory mainly attempts to solve the problem of black holes by solving the two main theories of physics that are superficially incompatible, quantum mechanics and general relativity.

However, all of these studies are theoretical assumptions and conjectures that cannot be verified.

Lin Zixuan wanted to take this opportunity to ask Einstein face about his idea and whether time travel was feasible.

The scholars here are no strangers to time travel, and most of those who have come into contact with Western literature know about it.

In 1895, the classic masterpiece "Time Machine" by British science fiction writer Wells came out, which threw this question to the world and caused a lot of controversy.

Although "Xun Qin Ji" was not very popular in this era, it also put forward the concept of "crossing".

Traveling through time and space, going back to the past, has always been considered a plot in fiction, and has nothing to do with science.

At this time, Lin Zixuan asked this question in front of a great scientist, which caused everyone to laugh good-naturedly.

Because such a question is in line with Lin Zixuan's identity as a writer, it will also become an interesting anecdote and add color to this dinner.

Einstein thought about it and seemed to really consider whether there was such a possibility.

"I don't think it's very likely, and I can't verify it." Einstein smiled and shook his head, "The speed of light is currently the fastest known speed in the universe, and it doesn't make much sense to talk about going beyond the speed of light, it can only be a hypothesis, of course, you can realize this dream in a novel." ”

This was the only communication between Einstein and Lin Zixuan.

The two had neither sparks of thought nor an exchange of wisdom, just an ordinary conversation that disappointed the onlookers around them.

Lin Zixuan is self-aware.

He may gain admiration for flaunting that bit of science fiction knowledge in front of ordinary people, but it would be self-defeating to show off in front of a top scientist.

At this time, Albert Einstein was studying quantum mechanics, and he confirmed that time slows down when an object approaches the speed of light, and when an object exceeds the speed of light, time may bend.

There are many possibilities for this bend, and going back in time is just one of the conjectures, and it is difficult to explain clearly.

He didn't think the Chinese novelist could understand such a complex physics subject, so he made a few perfunctory sentences.

In 1935, Albert Einstein mentioned the concept of a "space-time bridge", commonly known as a wormhole, in a paper in which he believed that there might be a narrow tunnel in the universe that connects two different space-times, allowing time travel.

After the dinner, Lin Zixuan returned home, and he still had to prepare for the wedding tomorrow at the Holy Trinity Church in the Public Concession.

Founded in 1869 by the British, Trinity Church is a church serving the Anglican Communion in the British diaspora, and is currently the most luxurious church in Shanghai.

Lin Zixuan's wedding caused quite a stir, and the marriage news was published in the "Declaration".

At this time, there is no marriage certificate for marriage, but there is a marriage certificate.

On August 19, 1914, the Beiyang government promulgated the "Regulations on the Affixing of Stamps on Personnel Certificates", stipulating that each marriage certificate is stamped with ** one yuan, if it is not stamped or stamped, it cannot be used as a valid proof of marriage in court.

This kind of marriage certificate with a printed ** is considered a marriage certificate certified by the government.

When a large family gets married, the marriage news should be published in the newspaper to show the solemnity, and it is also a witness, of course, the news will also be published in the newspaper when the divorce occurs.

Albert Einstein stayed at the home of a Jew in Shanghai at No. 9 Dumei Road in the French Concession of Shanghai.

As a Jew, he was invited by the Shanghai YMCA and the Academic Research Society to give a lecture on the theory of relativity at 3 p.m. on January 1, 1923, in the auditorium of the Ministry of Industry of the Public Concession, No. 17 Fuzhou Road.

In other words, when Lin Zixuan got married, Einstein was talking about the theory of relativity.

At 11 o'clock on January 2, 1923, Einstein left Shanghai on the ship "Haruna Maru" and returned to Europe.

When he was at sea, he recalled his experience in Shanghai, habitually wrote about his travels, and occasionally flashed the figure of Lin Zixuan in his mind.

Einstein was not impressed by Lin Zixuan, he didn't even remember Lin Zixuan's name, or he didn't remember the names of most Chinese.

He just remembered the question that Lin Zixuan asked, at least the question about time travel was quite interesting among all the questions.

Time travel?

Einstein smiled, he didn't think this idea would become a reality, but he didn't know that he and a time-traveler had just missed it.