# Tag Info

## Hot answers tagged models

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There are strong constraints on antigravitating antimatter, because it could, in principle, be used, to create a perpetual motion machine. 1) Use energy $E$ to create a particle/antiparticle pair at height $h_{i}$ 2) Raise the particle/antiparticle pair to a height $h_{f}$. This takes zero work, because the antiparticle will be pushed up in the ...

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Astrophysicists have been looking at electron positron annihilations in the cosmos The Universe viewed trough INTEGRAL: the first complete map of the sky at the electron-positron annihilation energy (Credits J. Knödlseder - CESR - September 2005). If there existed regions in the sky where antimatter was aggregating, the interface between matter and ...

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