What would it be like to travel faster than light?


A particle moving in a medium can exceed the speed of light because light travels more slowly in the medium than in a vacuum. In water, for example, the speed of light is only three-quarters of the speed of a vacuum.

However, the question probably refers to exceeding the vacuum speed of light. There is no observational data on this, so the answer must be considered on the basis of known theories.

Physicist Albert Einstein according to a narrow theory of relativity, a particle cannot be accelerated to the speed of light – it would require an infinite amount of energy. However, the theory does not deny that a piece could not move faster than light. The general theory of relativity allows for mathematical solutions in which space-time forms a kind of fold or bubble that moves the light of the observer inside it faster from space to place in space-time.

Content continues after ad

The traveler inside the fold does not experience anything special or moves faster than light, but the space-time around him is shaped in a way that allows light to move from one place to another faster. The fold is like a moving train carriage where we drive a race car: the car moves at a speed higher than its own top speed relative to the track.

The content continues below the ad

Traveling faster than light could have special consequences, as it allows you to travel back in time. In that case, the order of cause and effect may change: As I began to write this answer, I received the finished text I sent myself as a pleated letter tomorrow. So I don’t have to write anything, it’s enough to send the text to myself tomorrow so that it arrives yesterday. But who strangely wrote the text or was it born from scratch?

As a defendant

Kimmo Tuominen,
physicist, University of Helsinki.

Published in Science Journal 7/2021


Source: Tiede by www.tiede.fi.

*The article has been translated based on the content of Tiede by www.tiede.fi. If there is any problem regarding the content, copyright, please leave a report below the article. We will try to process as quickly as possible to protect the rights of the author. Thank you very much!

*We just want readers to access information more quickly and easily with other multilingual content, instead of information only available in a certain language.

*We always respect the copyright of the content of the author and always include the original link of the source article.If the author disagrees, just leave the report below the article, the article will be edited or deleted at the request of the author. Thanks very much! Best regards!