Gravitational Stealths

Cuauhtémoc Campuzano (Universidad Veracruzana)

The sensibility of Einstein's equations to the presence of matter is well known so that that the slightest presence of this is enough to change the geometry of spacetime. However, it was showed that there are nontrivial configurations without back reaction on the geometry of the spacetime in which it has been shown the existence of a reverse reaction on the geometry of spacetime. Nowadays, several works shown the existence of a stealth field in different contexts. In this talk we present some stealth's solutions to the Einstein equations and some implications that we have found in cosmology.