5 votes

GR contribution to time dilation when both clocks are falling freely

Option (2) is correct. The time dilation, both the "GR" and "SR" components, arises from applying the Schwarzschild spacetime interval to determine the proper time interval for one ...
ProfRob's user avatar
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4 votes
Accepted

GR contribution to time dilation when both clocks are falling freely

Your statement (2) is correct. Gravitational time dilation is a function of gravitational potential, not of acceleration. The equivalence principle is true only locally, i.e. in the limit as the ...
Eric Smith's user avatar
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4 votes

Imagine a universe with only 2 objects:

If the electron is moving at a constant velocity, will the detector ever register a magnetic field? If a point charge (e.g., an electron) is moving at a constant velocity, the electromagnetic field ...
hft's user avatar
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1 vote
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Image of an electron

An "image" is formed from lots of light rays leaving the same object. For instance, when your eye forms an image of a symbol on your computer screen, like this symbol, $$ \sum $$ what's ...
rob's user avatar
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1 vote
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Train example of special relativity

If the lights on the train flash simultaneously in the frame of the train, then the light from each will arrive at Eric at the same time and he will raise his hand once. In that scenario in your ...
Marco Ocram's user avatar
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1 vote

Borde-Guth-Vilenkin (BGV) Theorem equation for the motion free falling observer

This can be seen from the variational principle $$ \delta \int\sqrt{-g_{\mu\nu}dx^\mu dx^\nu}=0 $$ and eq.(7) in the paper, i.e. $u_\mu u^\mu=-1$. From the Lagrange equations $$ \frac{d}{ds}\frac{\...
Jon's user avatar
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1 vote

Absolute rest in special relativity

No, your idea is incorrect. Time dilation is relative. If two objects are moving relative to each other, each object will be time dilated to the same extent relative to the other. If you perform your ...
Marco Ocram's user avatar
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1 vote

Question regarding time dilation

Time dilation is indeed symmetric, since velocity is relative. But if a rocket ship turns around, it's definition of simultaneity changes, and it has to take that into account when calculating the ...
Eric Smith's user avatar
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1 vote

In quantum mechanics, is there an actual difference between 'observation' and interaction?

A measurement is an interaction that records some information about the system being measured. The Elitzur Vaidman bomb tester (EVBT) fits into this way of thinking about measurement. In quantum ...
alanf's user avatar
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1 vote

In quantum mechanics, is there an actual difference between 'observation' and interaction?

There are differences depending upon the interpretation of QM. The main difference being whether consciousness plays a role. However,in relational QM pioneered Rovelli in the mid 90s, there is no ...
Mozibur Ullah's user avatar

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