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Nonlinear matter spectra in coupled quintessence

Saracco, Fabio and Pietroni, M. and Tetradis, N. and Pettorino, V. and Robbers, G. Nonlinear matter spectra in coupled quintessence. Physical Review D, 82. 023528. ISSN 1550-7998 (2010)

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We consider cosmologies in which a dark-energy scalar field interacts with cold dark matter. The growth of perturbations is followed beyond the linear level by means of the time-renormalization-group method, which is extended to describe a multicomponent matter sector. Even in the absence of the extra interaction, a scale-dependent bias is generated as a consequence of the different initial conditions for baryons and dark matter after decoupling. The effect is enhanced significantly by the extra coupling and can be at the 2%–3% level in the range of scales of baryonic acoustic oscillations. We compare our results with N-body simulations, finding very good agreement.

Item Type: Article
Identification Number: 10.1103/PhysRevD.82.023528
Subjects: Q Science > QC Physics
Research Area: Economics and Institutional Change
Depositing User: Caterina Tangheroni
Date Deposited: 16 Nov 2015 15:47
Last Modified: 16 Nov 2015 15:47
URI: http://eprints.imtlucca.it/id/eprint/2905

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