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CATEGORIES:Cosmology Lunch
SUMMARY:Limits on Dark Radiation\, Early Dark Energy\, and
  Relativistic Degrees of Freedom - Erminia Calabre
 se (Oxford University)
DTSTART;TZID=Europe/London:20120130T130000
DTEND;TZID=Europe/London:20120130T140000
UID:TALK35961AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/35961
DESCRIPTION:Recent cosmological data analyses hint at the pres
 ence of an extra relativistic energy component in 
 the early universe.  If further data confirms this\
 , it could suggest new dark matter such as a steri
 le neutrino or a decaying particle\, or nonstandar
 d thermal history. Or it could indicate that dark 
 energy does not fade away to the ∼10^−9 fraction o
 f the energy density at CMB recombination that is 
 predicted by the cosmological constant. Indeed\, s
 ome proposed particle physics explanations for dar
 k energy involve scaling fields with an early energ
 y density which is a constant fraction of the ener
 gy density of the dominant component. Another poss
 ibility is that the evidence for the extra relativ
 istic component may be signaling the presence of a
  “dark radiation” component in the early universe\
 , as predicted by certain higher dimension branewo
 rld scenarios. Any of these would be exciting exte
 nsions to the standard\, concordance model. Uncove
 ring new degrees of freedom would be of great impo
 rtance\, and distinguishing between the possible o
 rigins could give valuable insight into physics an
 d cosmology. We examine the capabilities of curren
 t and future data to constrain and discriminate be
 tween these explanations\, to detect the early dar
 k energy density associated with them and to const
 rain neutrinos properties.
LOCATION:CMS\, Pav.B\, CTC Common Room (B1.19)
CONTACT:Camille Bonvin
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