Gravitational force between matter and antimatter

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Delta2
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What is the current scientific consensus on the gravitational force between matter and antimatter. Is it repulsive, attractive or zero?
 

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  • #2
anuttarasammyak
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Antiparticle of photon is itself and photons attract.
 
  • #3
Vanadium 50
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It is a prediction of GR than it is attractive. If it were not (and indeed, not the same as for matter) it violates conservation of energy.
 
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Yes, it is clearly predicted to be attractive, but this has not been experimentally tested yet.
 
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  • #5
hmmm27
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Yes, it is clearly predicted to be attractive, but this has not been experimentally tested yet.
But, we've made antimatter... didn't anybody notice if the stuff tended to fall down, or up ?
 
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But, we've made antimatter... didn't anybody notice if the stuff tended to fall down, or up ?
No. The antimatter that we have made is charged and it is hard to get a region where the EM field is so small that you can see which way it falls under just gravity.
 
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Gaussian97
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No. The antimatter that we have made is charged and it is hard to get a region where the EM field is so small that you can see which way it falls under just gravity.
Actually, we have made neutral antimatter, but I think that their gravitational properties haven't been studied yet.
 
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  • #8
strangerep
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If one believes the press releases, various experiments might be getting close to measuring the gravitational properties of antimatter (compared to matter) at good accuracy. Check out the following article:

AEgIs -- Cern Courier Feb 2021
 
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