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Constraints on large scale inhomogeneities from WMAP-5 and SDSS: confrontation with recent observations

Abstract:

Measurements of the SNe Ia Hubble diagram which suggest that the universe is accelerating due to the effect of dark energy may be biased because we are located in a 200-300 Mpc underdense "void" which is expanding 20-30% faster than the average rate. With the smaller global Hubble parameter, the WMAP-5 data on cosmic microwave background anisotropies can be fitted without requiring dark energy if there is some excess power in the spectrum of primordial perturbations on 100 Mpc scales. The SDS...

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Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Theoretical Physics
Journal:
Mon.Not.Roy.Astron.Soc.
Volume:
401
Issue:
1
Pages:
547
Publication date:
2008-07-28
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
URN:
uuid:124458d0-4635-4b0a-a80e-c8eb9c2dcd83
Source identifiers:
180080
Local pid:
pubs:180080
Language:
English
Keywords:

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