How does time travel work?
Einstein's T i m e Dilation
The slowing down of clocks in motion is known as time dilation, according to the first observer he is at rest and the moving observer is moving past him; according to him it is the other clock that is running slowly with the flow of time.
The faster the relative velocity, the greater the time dilation between one another, with the rate of time reaching zero as you approach the speed of light, time slows according to the observer.
Velocity is a vector, meaning it has a magnitude and a direction.
Gravity is not just a force.
This effect measures the amount of time that has elapsed between two events by observers at different distances from a gravitational mass. In other words, time runs slower wherever gravity is strongest, and this is because gravity curves space-time.
You can see the evidence travelling forward in time within the forth dimension (time and motion) however it is also possible to travel back in time using a device that generates a powerful laser in a twisted spiral, intense beams of coherent monochromatic light (or electromagnetic radiation) by stimulated emission of photons from excited atoms. This is a good way to receive messages from the future (all moments of time exist).
In quantum machanics particles pop in and out of existance, this is why they are not predictable, one alternate reality will interact having an effect over another reality. We all know gravity and velocity warp the frabric of space-time, thus space-time is a merely a dimension.
Imagine you travel away from Earth into space at the speed of light, because your eyes see at the speed of light it will appear the clock on Earth will have stopped, this in itself is time travel. Your time slows relative to Earth, so you age at what you feel is the normal rate of time, the people on Earth however will be ageing at a much faster rate, relative to you, this is known as 'twins paradox'.
Imagine, in a spontaneous loop, your older self arrives from the future and hands you the blueprint for you to build a time-machine, with strict instructions to use it to later travel back and deliver the blueprint to yourself and thereby complete the loop. What, if anything, caused the loop to occur? Where did the information on the blueprint come from? To answer this question we look at time dimensions.
The future already exists, (but only in subtle dimensions) Einstein explained that space-time is a fabric, you live in the thin line of the present, however the past still exists entangled within this fabric as well as the future. It doesn't necessarily mean your life is mapped out, it is mapped out, but within the infinite dimensional fabric, which holds infinite possible outcomes, all woven into this fabric of space-time. Your past, your present and future all coesist because they're woven into this infinite fabric.
To travel back in time, in physics you'd need to travel faster than the speed of light, however this is not possible, but it will be possible in future technology by mutating particles, (thus traversing the bridge between points of time) The past, present and future are connected in what later becomes known as plate dimensional connectivity.
When you go back in time you don’t see everything go back in reverse, it’s not like that, these are subtle dimensions that exist in the fabric of space-time, moreover outside the dimension you are currently in, however, the blueprints for this time machine, when you build it, and when you travel back in time to hand the blueprints to your younger self, you will in fact be handing them to a copy of yourself, it will not be you, but this copy could become you in a later time dimension, a bit like you'd observe an old photograph of yourself, it was once you but not you now.
Copies of yourself exist infinitely within these infinite dimensions, so if you travel to the past or future you'll access dimensions which will be a play and display of infinite possible outcomes all connected in a seamless coat, it is IMPORANT to note, you are the universe and as you observe it, your thoughts help to create it.