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SUMMARY:H0 tension and the effects of local structure - Antonio Romano\, U
 niversity of Crete
DTSTART:20150630T150000Z
DTEND:20150630T160000Z
UID:TALK60025@talks.cam.ac.uk
CONTACT:Paula younger
DESCRIPTION:Recent measurements of the cosmic microwave background (CMB) r
 adiation have shown an apparent tension with the present value of the Hubb
 le parameter inferred from local observations of supernovae\, which look c
 loser\, i.e. brighter\, than what is expected in a homogeneous model with 
 a value of the Hubble parameter equal to the one estimated from CMB observ
 ations(H^CMB_0). \n\nWe examine the possibility that such a discrepancy is
  the consequence of the presence of a local inhomogeneity seeded by primor
 dial curvature perturbations\, finding that a negative peak of the order o
 f less than two standard deviations could allow to fit low red-shift super
 novae observations without the need of using a value of the Hubble paramet
 er different from H^CMB_0. The type of inhomogeneity we consider does not 
 modify the distance to the last scattering\, making it compatible with the
  constraints of the PLANCK mission data.\n\nWe also consider the effects o
 n the value of cosmological constant\, finding a possible correction up to
  the order of 1.5% respect to the value obtained by fitting supernovae ign
 oring the effects of local inhomogeneities.
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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