When matter and anti-matter annihilate each other, does the gravity remains?

Answer 1

It would seem so.
Matter/antimatter annihilation (which has been observed many many times both naturally and man made), results in energy, i.e. photons, which, though massless, do have gravitational interactions. That is the point of general relativity (light bends in a gravitational field). It's a long story... 4 years of college majoring in physics and 6 years writing a PhD in high energy physics will clear it all up for you.

Answer 2

First of all, the annihilation of matter with anti-matter HAS been observed as electrons and positrons annihilate eachother. The amount of mass involved is so small that the amount of energy released will not cause a "nuclear" type explosion.

Anyway, back to your question. Antimatter does not have antigravitational force associated with it. It is simply matter which has a charge opposite to what you would expect. For example a positively charged electron (positron).

When an electron and positron annihilate eachother, the first thing that happens is that their charge becomes neutralised, and then they become unstable forms of matter, so they convert themselves into pure energy in accordance with Einstein's equation E=mc^2. If there is no matter, then there is no gravity.

Answer 3

Since all matter is indestructible it would be a violation of the second, three, fifth and eighteenth laws of thermodynamics were the gravy to disappear. According to a little known German physicist who wasted his time working in the Swiss patent office in Bern, where he went cockcoo, gravity would be transformed into energy as in a nuclear explosion. But nobody has ever seen the phenomenon of matter meeting anti-matter and thus destroying the energy at the speed of light squared, the effect would be beyond the imagination of humans who have seen the destruction caused by nuclear fusion on earth.

Answer 4

No. You can think of forces in terms of sources and fields. Mass is the source of gravitational fields . When there is no mass, there is no field. In the case of particle annhilation, the matter of the particle-antiparticle pair is converted into energy, so no mass and thus no gravitational field remains.

Answer 5

I would imagine not; gravity is a property of (anti)matter, which is no longer present.

Answer 6

After annilihation, the released energy disperses, so spactime "flattens out", and along with it any "gravity". It doens't hang around long.