On Possible Variation in the Cosmological Baryon Fraction - INSPIRE

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On Possible Variation in the Cosmological Baryon Fraction

Jul, 2009

7 pages

Published in:

Astrophys.J. 716 (2010) 907-913

e-Print:

0907.3919 [astro-ph.CO]

DOI:

10.1088/0004-637X/716/2/907

View in:

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Abstract: (arXiv)

The fraction of matter that is in the form of baryons or dark matter could have spatial fluctuations in the form of baryon-dark matter isocurvature fluctuations. We use big bang nucleosynthesis calculations compared with observed light element abundances as well as galaxy cluster gas fractions to constrain cosmological variations in the baryon fraction. Light element abundances constrain spatial variations to be less than 26-27%, while a sample of "relaxed" galaxy clusters shows spatial variations in gas fractions less than 8%. Larger spatial variations could cause differential screening of the primary cosmic microwave background anisotropies, leading to asymmetries in the fluctuations and ease some tension with the halo-star 7Li abundance. Fluctuations within our allowed bounds can lead to "B-mode" CMB polarization anisotropies at a non-negligible level.

Note:

7 pages, 3 figures, submitted to ApJ

galaxy: cluster
cosmic background radiation: anisotropy
nucleosynthesis: big bang
fluctuation
baryon
dark matter
screening

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