Considering bradyons, particles moving slower than the speed of light , infinite energy is needed to accelerate to reach speed of light. As for theoritical tachyons infinite energy is needed to decelerate to reach speed of light. As a result of this theory, time moves backwards according to tachyons, and forward according to us (bradyons)... so considering light itself, a particle moving at the speed of light, how does time work. is it moving forwards or backwards, or non existent at all?
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All particles move at or below the speed of light. And only those without rest mass move at light speed in a vacuum.
Tachyons do not exist. They are the result of scifi and a few fringe physicists asking "But what if something could go faster than light?" And that's like saying "But what if pigs could fly?" Silly.
Consensus [See source.] is that time is merely the unfolding of events. In fact, Einstein is said to have said something like "Time is nature's way of ensuring that all events don't happen at once."
So we have past events, which we might remember but they have ceased to exist. And we have future events, which are yet to unfold; so they do not exist either. That leaves us with the now events, which are unfolding in the present...like you reading this answer right now.
As events unfold, entropy rises. So travel into the past is impossible because that would require lowering the entropy of the universe back to what it was back then and there. That would be like putting Humpty Dumpty back together again...and you know how that turned out.
There is no similar issue when traveling into the future however. Events have not yet unfolded; so there is no need to adjust the entropy. And in fact we, you, me, and everyone on Earth, do travel into the future regularly. To be sure, at the speeds we normally travel, that means not more than a few nano seconds (1E-9 sec) into the future, but into the future nonetheless.
Tachyons do not exist. They are the result of scifi and a few fringe physicists asking "But what if something could go faster than light?" And that's like saying "But what if pigs could fly?" Silly.
Consensus [See source.] is that time is merely the unfolding of events. In fact, Einstein is said to have said something like "Time is nature's way of ensuring that all events don't happen at once."
So we have past events, which we might remember but they have ceased to exist. And we have future events, which are yet to unfold; so they do not exist either. That leaves us with the now events, which are unfolding in the present...like you reading this answer right now.
As events unfold, entropy rises. So travel into the past is impossible because that would require lowering the entropy of the universe back to what it was back then and there. That would be like putting Humpty Dumpty back together again...and you know how that turned out.
There is no similar issue when traveling into the future however. Events have not yet unfolded; so there is no need to adjust the entropy. And in fact we, you, me, and everyone on Earth, do travel into the future regularly. To be sure, at the speeds we normally travel, that means not more than a few nano seconds (1E-9 sec) into the future, but into the future nonetheless.
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