Dark Matter Equation of State

ANA LAURA SERRA; MARIANO JAVIER DE LEON DOMINGUEZ ROMERO

Varenna, Italy

Workshop; Student Talk at the Enrico Fermi School, Course CLXXII - ”Astrophysics of Galaxy Clusters”; 2008

Italian Physical Society

According to General Relativity, both density and pressure contribute to the space-time curvature, but the perception of this gravitational field depends on the velocity of probe particles. This effect becomes specially important when kinematic and gravitational lensing properties are compared, since the probe particles are fundamentally different. Then, it could be possible to calculate the pressure profile of astrophysical systems dominant component. In this work we calculate the mass profile of a simulated cluster and three real clusters, via Jeans Equation and the Caustic Technique. We compare these kinematic profiles with those calculated via lensing formalism and the we obtain a radial profile for the Dark Matter Equation of State.