Dark Matter & Dark Energy from a single scalar field: CMB spectrum and matter transfer function

Details Dark Matter & Dark Energy from a single scalar field: CMB spectrum and matter transfer function Dark Matter & Dark Energy from a single scalar field: CMB spectrum and matter transfer function

2007-09-03

arxiv.org/abs/0709.0174v1

JCAP 0709:017,2007

Astronomy and Astrophysics

Astrophysics

15 pages, 8 figures, accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2007/09/017

The dual axion model (DAM), yielding bot DM and DE form a PQ-like scalar field solving the strong CP problem, is known to allow a fair fit of CMB data. Recently, however, it was shown that its transfer function exhibits significant anomalies, causing difficulties to fit deep galaxy sample data. Here we show how DAM can be modified to agree with the latter data set. The modification follows the pattern suggested to reconcile any PQ-like approach with gravity. Modified DAM allows precise predictions which can be testable against future CMB and/or deep sample data.

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