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SUMMARY:Testing the concordance cosmology at large and small cosmic scales
  - Yin-Zhe Ma\, KICC
DTSTART:20101129T130000Z
DTEND:20101129T140000Z
UID:TALK28049@talks.cam.ac.uk
CONTACT:Andrew Pontzen
DESCRIPTION:In this talk\, I am going to test the concordance cosmology in
  three different cosmic scales. (1) On the super-horizon scale\, “Copi e
 t al. (2009)” have been arguing that the lack of large angular correlati
 ons of the CMB temperature field provides strong evidence against the stan
 dard\, statistically isotropic\, LCDM cosmology. I am going to argue that 
 the “ad-hoc” discrepancy is due to the sub-optimal estimator of the lo
 w-l multipoles\, and a posteriori statistics\, which exaggerates the stati
 stical significance.\n(2) LCDM model also predict the existence of primord
 ial gravitational wave\, for which B-mode polarization will be a powerful 
 tool to distinguish different models of the early Universe\; (3) On Galact
 ic scales\, “Watkins et al. (2008)” shows that the very large bulk flo
 w prefers a very large density fluctuation\, which seems to contradict to 
 the LCDM model. We provide a physical explanation for this big bulk flow\,
  based on the assumption that CMB frame does not coincide with matter rest
  frame\, resulting in the tilted Universe. We show that the ‘tilted Univ
 erse’ could well explain the bulk flow phenomena and more importantly\, 
 the constraints for this tilted Universe can lead to the constraint on the
  number of e-folds of inflation.
LOCATION:CMS\, Pav.B\, CTC Common Room (B1.19)
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