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SUMMARY:A new class of adiabatic Unified Dark Matter models - Oliver Piatt
 ella (Portsmouth)
DTSTART:20090708T124500Z
DTEND:20090708T131500Z
UID:TALK18664@talks.cam.ac.uk
CONTACT:Dr Jonathan Gair
DESCRIPTION:We investigate a new class of Unified Dark Matter (UDM) models
  described by adiabatic equations of state which are able to avoid the no-
 go theorem by Sandvik-Tegmark-Zaldarriaga-Waga (2004). In particular\, we 
 investigate those UDM models which allow a fast transition of the pressure
  during the dark matter epoch. These models avoid the strong time evolutio
 n of the gravitational potential and\, consequently\, they lead to structu
 re formation. In more detail\, we analyse their properties from the point 
 of view of the background and perturbative evolution and compare the predi
 cted CMB anisotropies and matter power spectrum with observation.
LOCATION:Sackler Lecture Theatre\, IoA
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