Cosmological simulations and gravitational lensing: statistical signatures of substructures

Details Cosmological simulations and gravitational lensing: statistical signatures of substructures Cosmological simulations and gravitational lensing: statistical signatures of substructures

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..215p&link_type=abstract

SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in

Astronomy and Astrophysics

Astrophysics

Scientific paper

The popular model of hierarchical structure formation in a universe dominated by cold dark matter, while quite successful in matching the observed large-scale density distribution, is currently facing a "small-scale crisis". For instance, the predicted abundance of satellites (or substructures) is more than an order of magnitude larger than the number of dwarf galaxies with comparable mass within the local group. This "missing satellite problem" represents then an ideal framework in order to test theoretical models. We present a new approach, based on numerical modelling and a perturbative theory, to study and characterize statistical signatures of substructures in the strong lensing regime.

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