Exact gravitational lensing for spherically symmetric spacetimes

GALLO EMANUEL; MORESCHI OSVALDO

Districto Federal

Conferencia; GR19 19th International Conference on General Relativity and Gravitation; 2010

International Society on General Relativity and Gravitation

We present new expressions for optical scalars of gravitational lensing thar are gauge invariants and valid for a general spherically symmetric spacetime, without restriction on the matter content. We also present a spinorial model for dark matter with non vanishing pressure that is compatible with the observations of gravitational lensing observed in clusters of galaxies. In particular we fit with this model the observed shears in the Comma cluster, and we compute the respective mass.