N-Body Simulations and Gravitational Lensing with Dark Energy
Carlo Baccigalupi
SISSA / ISAS
bacci@sissa.it
Additional authors: Matthias Bartelmann, Klaus Dolag, Massimo Meneghetti, Lauro Moscardini, Francesca Perrotta, Giuseppe Tormen
We discuss the recent results (Dolag et al. A&A 2004 in press) of N-body simulations in different Quintessence scenarios yielding equation of state today close to -1 but having markedly different behavior in the past. In particular, we show that cluster concentration keeps a record of the expansion rate at the time of the cluster formation, through a simple correction involving the linear perturbation growth rate. We also show how these features affect the lensing pattern around clusters.
