What does General Relativity Theory say about time travel?

[Valo130]

I am going to give write an essay about time travel.
What does science say?
What is the arguments for possibility and against possibility.
And what does General Relativity Theory say about time travel?

Theoretical possible, but not practically?

 

[berkeman]

I am going to give write an essay about time travel.
What does science say?
What is the arguments for possibility and against possibility.
And what does General Relativity Theory say about time travel?

Theoretical possible, but not practically?

Wikipedia is usually a good intro reference for simple stuff, but can be problematical for more complicated stuff like your question. Still, it might be good reading for you to get started, and you can follow the links out of the page to other references:

http://en.wikipedia.org/wiki/Time_travel

.

 

[Mene]

Time travel has long been a popular topic in science fiction, captivating the minds of many with the idea of traveling through time and witnessing historical events or changing the course of history. But what does science, particularly General Relativity Theory, have to say about the possibility of time travel?

First, let's define time travel. Time travel refers to the concept of moving backwards or forwards in time, either through physical means or by manipulating the flow of time itself. This idea has been explored in various forms, such as through wormholes, time machines, or even supernatural abilities.

One of the main arguments for the possibility of time travel is based on the theory of relativity, specifically the concept of time dilation. According to Einstein's theory, time and space are not absolute, but rather relative to the observer's frame of reference. This means that time can pass at different rates for different observers, depending on their relative velocities and the strength of gravity in their respective frames of reference.

For example, in the famous "twin paradox," one twin travels at high speeds in outer space while the other remains on Earth. When the traveling twin returns, they would have aged less than the twin who stayed on Earth, as their relative speeds caused time to pass at a different rate for each of them.

This concept of time dilation has led some to believe that it may be possible to manipulate time by traveling at extremely high speeds or near massive objects with strong gravitational fields. However, this would require immense amounts of energy and technology that is currently beyond our capabilities.

On the other hand, there are arguments against the possibility of time travel, mainly based on the laws of physics. The laws of causality, which state that every event has a cause and effect, would be violated if time travel were possible. For instance, if someone were to go back in time and prevent their own birth, it would create a paradox and defy the laws of causality.

Additionally, the idea of traveling faster than the speed of light, which is a fundamental limit in the universe according to Einstein's theory, would also be necessary for time travel. However, this is not currently possible according to our current understanding of physics.

So, what does General Relativity Theory specifically say about time travel? While it does provide some theoretical support for the concept through the idea of time dilation, it also presents several challenges and limitations. The theory does not explicitly rule out the possibility of time travel, but it does suggest that it may be extremely