# The Naked Scientists Forum

### Author Topic: Is time dilation additive or subtractive in overlapping gravitational fields?  (Read 1187 times)

#### jeffreyH

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##### Is time dilation additive or subtractive in overlapping gravitational fields?
« on: 12/12/2013 17:04:25 »
If we have two large masses near to each other and a smaller mass between them would the effect of time dilation increase, decrease or stay the same in the two overlapping fields as opposed to being in a zero gravity field?

#### Pmb

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##### Re: Is time dilation additive or subtractive in overlapping gravitational fields?
« Reply #1 on: 12/12/2013 17:21:40 »
Quote from: jeffreyH
If we have two large masses near to each other and a smaller mass between them would the effect of time dilation increase, decrease or stay the same in the two overlapping fields as opposed to being in a zero gravity field?
I can't picture this so let me describe what I have in mind. At x = L there is a massive star and at x = -L there is an identical star. At x = 0 there's a small moon. Then the effects would add but not linearly. But I don't see what roll the third small body brings to this question so why mention it at all?

#### jeffreyH

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##### Re: Is time dilation additive or subtractive in overlapping gravitational fields?
« Reply #2 on: 12/12/2013 18:01:55 »
Quote from: jeffreyH
If we have two large masses near to each other and a smaller mass between them would the effect of time dilation increase, decrease or stay the same in the two overlapping fields as opposed to being in a zero gravity field?
I can't picture this so let me describe what I have in mind. At x = L there is a massive star and at x = -L there is an identical star. At x = 0 there's a small moon. Then the effects would add but not linearly. But I don't see what roll the third small body brings to this question so why mention it at all?

Hi Pete

The small body would have its own gravitation and I was wanting to know the combined effect from the other sources of gravitation on it. I am investigating the possible effects on momentum and rotation of orbiting bodies of time dilation. I am also looking for any articles on the effects of time dilation at the quantum level.

#### jeffreyH

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##### Re: Is time dilation additive or subtractive in overlapping gravitational fields?
« Reply #3 on: 12/12/2013 18:11:41 »
The following proposed experiment is of significant interest.

http://fqxi.org/community/articles/display/172

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##### Re: Is time dilation additive or subtractive in overlapping gravitational fields?
« Reply #3 on: 12/12/2013 18:11:41 »

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