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I guess I stand corrected on some points, but Wikipedia seems a lot less certain than you regarding anti-gravity. > Antihydrogen atoms should be attracted

by runeks 10y ago

I guess I stand corrected on some points, but Wikipedia seems a lot less certain than you regarding anti-gravity. > Antihydrogen atoms should be attracted to other matter > or antimatter gravitationally with a force of the same > magnitude that ordinary hydrogen atoms experience. > This would not be true if antimatter has negative > gravitational mass, which is considered highly unlikely, > though not yet empirically disproven (see gravitational > interaction of antimatter). I'm not sure what the exact meaning of "highly unlikely" is in this context. https://en.wikipedia.org/wiki/Antihydrogen#Characteristics https://en.wikipedia.org/wiki/Antihydrogen#Characteristics https://en.wikipedia.org/wiki/Gravitational_interaction_of_antimatter https://en.wikipedia.org/wiki/Gravitational_interaction_of_a...

dragonwriter 10y ago
I think it means that the theorized nature of antimatter in the dominant model has positive mass, other elements of that theory have proven out well, but we generate antimatter in the quantities we'd need to do good tests of gravitational interaction, so we haven't empirically verified its gravitational interaction.
dogma1138 10y ago
Gravity is the result of matter(or energy) interacting (bending) spacetime. All massive objects bend space time hence they generate gravity, the mass of an anti proton is exactly the same as that of a proton. We haven't observed full gravitational interactions because we only create tiny amounts of anti matter, and even less of molecular anti matter. Since all anti matter must be kept in vacuum and electro magnetic containment it's a bit hard to check how does anti mater works with gravity. There are very little frameworks where anti matter actually interacts differently with gravity and hence space time. Even MTOG theories tend to treat anti matter in the same manner, it has a positive mass (we can verify that), if it has a positive mass it also has a positive energy, if it has that it should interact with gravity in the same manner as any other massive object.

by runeks 10y ago

dragonwriter 10y ago

I think it means that the theorized nature of antimatter in the dominant model has positive mass, other elements of that theory have proven out well, but we generate antimatter in the quantities we'd need to do good tests of gravitational interaction, so we haven't empirically verified its gravitational interaction.

dogma1138 10y ago

Gravity is the result of matter(or energy) interacting (bending) spacetime. All massive objects bend space time hence they generate gravity, the mass of an anti proton is exactly the same as that of a proton. We haven't observed full gravitational interactions because we only create tiny amounts of anti matter, and even less of molecular anti matter. Since all anti matter must be kept in vacuum and electro magnetic containment it's a bit hard to check how does anti mater works with gravity. There are very little frameworks where anti matter actually interacts differently with gravity and hence space time. Even MTOG theories tend to treat anti matter in the same manner, it has a positive mass (we can verify that), if it has a positive mass it also has a positive energy, if it has that it should interact with gravity in the same manner as any other massive object.