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Nonlinear matter spectra in coupled quintessence

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 ext...

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Main Authors: Saracco, F. (Author) , Pietroni, M. (Author) , Tetradis, N. (Author) , Pettorino, Valeria (Author) , Robbers, G. (Author)
Format: Article (Journal)
Language:English
Published: 28 July 2010
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2010, Volume: 82, Issue: 2, Pages: 1-14
ISSN:1550-2368
DOI:10.1103/PhysRevD.82.023528
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.82.023528
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.82.023528
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Author Notes:F. Saracco, M. Pietroni, N. Tetradis, V. Pettorino, and G. Robbers

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520 |a 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. 
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