- #1
name123
- 510
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As I understand it, time dilation can occur under gravity or acceleration, which can be referred to as Gravity Time Dilation and can also appear to be happening when two things are in different frames of reference, which can be referred to as Velocity Time Dilation.
With Gravity Time Dilation, as I understand it there has been objective evidence that there is time dilation under gravity or acceleration.
With Velocity Time Dilation is the evidence here thought to be relative rather than objective?
Imagine for example two space ships were to pass each other. From Spaceship A's perspective, Spaceship B1 might be measured to have passed it at 0.2c in the +ve direction, and from Spaceship B1's perspective, Spaceship A1 might be measured to have passed it at 0.2c in the -ve direction. As I understand it, both would be stating that the clock of the other was going slower than its own clock. It would seem like a logical contradiction for that to objectively be the case, but it could be claimed that there is no objective truth on the matter, and that the truth about the situation is relative.
But supposing that unknown to the people on Spaceship A1 and Spaceship B1, Spaceship A1 was in the same frame of reference as Spaceship A2, and Spaceship B1 was in the same frame of reference as Spaceship B2, and that Spaceship A2 and Spaceship B2 were involved in a twin paradox experiment, where Spaceship B2 had accelerated away from Spaceship A2 and was going to go away and then back again.
As I understand it in the twin paradox experiment the clock on B2 would be thought to be objectively running slower than the clock on A2.
But if that was the case, then would the B1 not be running at the same rate as the B2 clock (whether it was in the same frame of reference as B2's outward journey unaccelerating velocity or B2's inward journey unaccelerating velocity) since they are in the same frame of reference, and likewise A1 be in the same frame of reference as A2. Such that while clock B1 could be thought to be running slower than the clock on A1 from A1's perspective, and the clock A1 could be thought to be running slower than the clock on B1 from B1's perspective, objectively the clock on B1 would be running slower than the clock on A1?
Is there any experiment not involving any Gravity Time Dilation which indicate that Velocity Time Dilation actually happens, rather than just appearing to?
With Gravity Time Dilation, as I understand it there has been objective evidence that there is time dilation under gravity or acceleration.
With Velocity Time Dilation is the evidence here thought to be relative rather than objective?
Imagine for example two space ships were to pass each other. From Spaceship A's perspective, Spaceship B1 might be measured to have passed it at 0.2c in the +ve direction, and from Spaceship B1's perspective, Spaceship A1 might be measured to have passed it at 0.2c in the -ve direction. As I understand it, both would be stating that the clock of the other was going slower than its own clock. It would seem like a logical contradiction for that to objectively be the case, but it could be claimed that there is no objective truth on the matter, and that the truth about the situation is relative.
But supposing that unknown to the people on Spaceship A1 and Spaceship B1, Spaceship A1 was in the same frame of reference as Spaceship A2, and Spaceship B1 was in the same frame of reference as Spaceship B2, and that Spaceship A2 and Spaceship B2 were involved in a twin paradox experiment, where Spaceship B2 had accelerated away from Spaceship A2 and was going to go away and then back again.
As I understand it in the twin paradox experiment the clock on B2 would be thought to be objectively running slower than the clock on A2.
But if that was the case, then would the B1 not be running at the same rate as the B2 clock (whether it was in the same frame of reference as B2's outward journey unaccelerating velocity or B2's inward journey unaccelerating velocity) since they are in the same frame of reference, and likewise A1 be in the same frame of reference as A2. Such that while clock B1 could be thought to be running slower than the clock on A1 from A1's perspective, and the clock A1 could be thought to be running slower than the clock on B1 from B1's perspective, objectively the clock on B1 would be running slower than the clock on A1?
Is there any experiment not involving any Gravity Time Dilation which indicate that Velocity Time Dilation actually happens, rather than just appearing to?