Perturbations in a coupled scalar field cosmology
I analyse the density perturbations in a cosmological model with a scalar field coupled to ordinary matter, such as one obtains in string theory and in conformally transformed scalar-tensor theories. The spectrum of multipoles on the last scattering surface and the power spectrum at the present epoc...
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| Main Author: | |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
01 March 2000
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2000, Volume: 312, Issue: 3, Pages: 521-530 |
| ISSN: | 1365-2966 |
| DOI: | 10.1046/j.1365-8711.2000.03165.x |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1046/j.1365-8711.2000.03165.x Verlag, kostenfrei, Volltext: https://academic.oup.com/mnras/article/312/3/521/1022886 
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| Author Notes: | Luca Amendola, Osservatorio Astronomico di Roma, Viale Parco Mellini 84, 00136 Roma, Italy |
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| 520 | |a I analyse the density perturbations in a cosmological model with a scalar field coupled to ordinary matter, such as one obtains in string theory and in conformally transformed scalar-tensor theories. The spectrum of multipoles on the last scattering surface and the power spectrum at the present epoch are compared with observations to derive bounds on the coupling constant and on the exponential potential slope. It is found that the acoustic peaks and the power spectrum are strongly sensitive to the model parameters. The models that best fit the galaxy spectrum and satisfy the cluster abundance normalization have field energy density Ωφ ≃0.05-0.15 and a scalefactor expansion law a∼tp, p≃0.67-0.69. | ||
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