Talk detail

Participant	Tetradis, Nikolaos
Institution	University of Athens - Department of Physics - Zographou - Attica - Greece

Session	DM1	Accepted		Order	Time
Talk	Oral abstract	Title	Viscous dark matter
Coauthors
Abstract	The possibility that dark matter can be described as a viscous fluid is considered. The effects of shear viscosity are examined in two scenarios: 1) Dark matter with shear viscosity arising from its fundamental interactions: The back-reaction of fluctuations on the average energy density could accelerate the cosmological expansion. 2) Conventional dark matter in a coarse-grained description: The effect of short-distance (galactic-scale) perturbations can be mapped onto pressure and viscosity terms in the effective theory of the long-distance perturbations. The calculation of the nonlinear power spectrum of the long-distance modes within the effective theory is expected to have better convergence properties than standard perturbation theory.
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