# Effect of Gravitational Field During Anti-Matter/Matter Collision

This may be a very basic question, please excuse my lack of knowledge but I don't seem to understand the concept of anti-matter gravity.

Upon research, many sources align with the conclusion that anti-matter reacts to gravity similarly to matter. ie. that it space-time warps around its mass.

If we consider a particle/anti-particle pair we would expect and conclude that there is no gravity (warp in space-time) by this. ie. Just the vaccum of space.

However, if we consider them as separate particles, then their corresponding gravities -pulling spacetime in the same direction, would add together (since gravity is not reversed for anti-matter). We would expect to increase the total gravity as they approach each other (greater density of mass in space-time). However, as we know, a pair would have no gravitational effects.

It's hypothetical but to clarify; consider a plane vacuum with one particle and one antiparticle beginning to collide. Disregarding their electrical attraction, they each warp space-time in the same direction due to their masses. However, after the collision (as a pair) there is no gravity. So, how would their gravitational potentials dissipate and react as they approach each other and collide.

• Why do you think a particle-antiparticle pair would not have gravity? Nov 1, 2023 at 21:08
• because its space its just a vaccum. If I were in space and assume all planets, stars etc DNE, then I wouldn't be pulled in any direction since there would be no gravity? no warp in space time for me to follow
– cav3
Nov 1, 2023 at 21:36
• I'm sorry; I don't follow at all. Are you asking about what occurs in the case when there are only two particles in the whole universe, and one is matter and one is antimatter? If so, then I'm not sure what the point of asking that is, but if not, then the answer is that it doesn't matter if it's antimatter or matter, they both act as if they had mass and interact gravitationally in the usual awy. Is there any way you can clarify? Nov 1, 2023 at 21:42
• It's hypothetical but yes consider a plane vacuum with one particle and one antiparticle beginning to collide. Disregarding their electrical attraction, they each warp space-time in the same direction due to their masses. However, after the collision (as a pair) there is no gravity. So, how would their gravitational potentials dissipate and react as they approach each other and collide.
– cav3
Nov 1, 2023 at 22:04