2007

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

Roberto, Mainini, Bonometto, Silvio

Understand

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.

Built on

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Then

Amendola L., 2004, Phys.Rev. D69, 103524
Original
2004
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Mainini R. & Bonometto S.A., 2004, Phys.Rev.Lett. 93, 121301; Mainini R., Colombo L. & Bonometto S.A., 2005, ApJ 632, 691
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Spergel D.N. et al. 2003, ApJS 148, 175; Spergel D.N. et al. 2006, astro-ph/0603449, ApJ (in press)
2006
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Olivares G., Atrio-Barandela F. & Pavon D., 2006, Phys. Rev. D74 043521
2006
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Colombo L.P.L. & Gervasi M., 2006, JCAP 0610, 001
2006
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Mainini R. & Bonometto S., 2007, astro-ph/0703303, JCAP in press
2007
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