Time dilation affects only clocks.
But everything is clock
Everything could be thought of as clock in a way because everything changes, but the term clock is commonly used to refer to an object that continually changes at a set pace, so that it can be used as a reference point.
In a science fiction film, Generations, there was a realm or state of existence called The Nexus where you could go back and see your children born or go ahead and see your grandchildren. When it comes to physics and our understanding of things what would it take for this to be true?
I don't want to get too off topic, but I like the concept of the Omega 13 from the movie Galaxy Quest. The problem is to change everything back 13 seconds it would have to be able to affect all existence and keep a constant record of where all existence was 13 seconds ago, which is physically impossible, at least to my understanding.
As for the video that
Petros2015 posted. The loaf of bread example is
under the assumption that time actually exists in the first place. To my understanding time dilation has been observed to
only slow time(rate of change) when matter is being affected by an accelerative or gravitational force.
I believe the loaf of bread example is
just a mathematical model or an abstraction of reality not reality itself. The extrapolations in time when the loaf of bread is being sliced at different angles are based on
a record of time not time itself. I disagree with the video after analyzing it. Below I explain what I believe is actually happening.
At 5:40 in the video what is
actually happening is when the alien is moving away from the man on the bench, the alien's
time(rate of change) is slower compared to the man on the bench simply because they previously had the same
time(rate of change),as stated at 5:15, but now the alien is experiencing a greater accelerative force which then causes his
time(rate of change) to slow. This is time time dilation.
The alien is not time traveling to the past, the alien is simply changing slower. If somehow the alien was instantly transported to the
man's location, no traveling to the past would take place regardless of how far or fast the alien moves in the opposite direction.
At 7:00 in the video what is
actually happening is when the alien is moving towards the man on the bench, the alien's
time(rate of change) is being slowed compared to the man on the bench due to experiencing a greater accelerative force. Again this is time dilation.
The slowing of the aliens
time(rate of change) will also slow the processes in which the alien ages, meaning that when the alien finally does reach Earth the alien will have aged more slowly than the man on the bench, and more
time(rate of change) will have occurred on Earth than in the alien's space ship. This might seem like time travel, but to me is similar to cryogenic freezing.
I have edited this post several times to improve readability and because the video was thought provoking, but in my opinion the time as a loaf of bread is nothing more than a construct of imagination.