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SUMMARY:Constraining Early Dark Energy with Current and Future CMB Data - 
 Erminia Calabrese (University of Rome)
DTSTART:20101123T163000Z
DTEND:20101123T173000Z
UID:TALK28029@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:One propery of a popular class of dark energy models is the tr
 acking behaviour of the dominant energy component so that the dark energy 
 density will sub-dominantly track the evolution of the dominant component 
 and can be never negligible with respect to radiation and matter.  Dark en
 ergy could therefore be present not only in the late universe but also in 
 early times as suggested by several models of "early" dark energy (EDE).  
 In this talk I will discuss the future constraints on EDE parameters achie
 vable by the Planck and CMBPol experiments considering the possibility of 
 EDE clustering through a sound speed < 1 (cold dark energy) and the presen
 ce of anisotropic stresses.  In particular I will show how a detection of 
 the lensing signal of the CMB can significantly improve the constraints on
  EDE.  Finally I will discuss how the recent indications (at one confidenc
 e level) for an extra background of relativistic particles can be partiall
 y explained by EDE.
LOCATION:Martin Ryle Seminar Room\, Kavli Building
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