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Does time go slower underwater?
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T3sl4co1l:
AFAIK, even black or white holes, composed of exotic matter, still exhibit time dilation, so there is no such thing as cancelling gravity.

Tim
Rick Law:

--- Quote from: StillTrying on July 13, 2020, 01:19:46 am ---What effect would 2 or more strong but opposite and cancelling gravitational fields have on the speed of a clock.

--- End quote ---

--- Quote from: T3sl4co1l on July 13, 2020, 01:44:46 am ---AFAIK, even black or white holes, composed of exotic matter, still exhibit time dilation, so there is no such thing as cancelling gravity.

Tim

--- End quote ---

He probably doesn't mean eliminating gravity, but merely staying on a Lagrange Point where the force of gravity is equal but in opposite direction.

But no luck -- At that point (and that is a moving point), gravitation fields cancels out - which means the space warping cancels out and space is flat.  Time dilation due to space warping is zero since at that point space is flat.  However, time dilation due to acceleration is not zero - read on...

Since two objects (say Earth and Moon) cannot be stationary to each other or they will collapse into each other due to mutual attraction.  So, the two objects has to move to fight the mutual attraction.  Both objects because Moon and Earth each orbit around the center of gravity of Earth+Moon, so both objects are moving and that point is a moving point.

Since you are trying to stay on a point (for t>0) that is a moving point, you must accelerate to move with it.  So you will get time dilation due to your acceleration.
T3sl4co1l:
You're also in a gravity well, so time will be slowed (relative to infinity) for that reason.  Unless it works out that the Lagrange point is truly neutral (zero potential energy relative to infinity, which is also to say it's not a stable orbit), I'm not very familiar with orbital mechanics.  But anyway, they will be a rotating system, which I think screws that all up anyway; your orbit is with respect to the bodies, which are themselves accelerating (towards each other), which is not an inertial frame of reference.
StillTrying:
"Point where the force of gravity is equal but in opposite direction."

Yes 2 heavy equal planets rotating around each other, the middle no-gravity point could be stationary.
EEVblog:
Technically the light itself does not slow down in water, it's the combined electromagnetic wave effect caused by the material:

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