B Gravitational force between matter and antimatter

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The scientific consensus suggests that the gravitational force between matter and antimatter is predicted to be attractive, in line with general relativity, although this has not yet been experimentally confirmed. Antimatter produced so far has primarily been charged, complicating the ability to observe its gravitational behavior due to electromagnetic interference. Neutral antimatter has been created, but its gravitational properties remain largely unstudied. Current research efforts are underway to measure the gravitational effects of antimatter with improved accuracy. The ongoing investigations may provide clearer insights into the nature of gravity as it relates to antimatter.
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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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Antiparticle of photon is itself and photons attract.
 
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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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Dale said:
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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hmmm27 said:
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.
 
Dale said:
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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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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