Observational constraints on the linear fluctuation growth rate
Several experiments in the near future will test dark energy through its effects on the linear growth of matter perturbations. It is therefore important to find simple and at the same time general parametrizations of the linear growth rate. We show that a simple fitting formula that generalizes prev...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2007
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/0707.2686
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| Verfasserangaben: | Cinzia Di Porto, Dipartimento di Fisica ‘‘E. Amaldi,’’ Università degli studi ‘‘Roma Tre,’’ Via della Vasca Navale 84, 00146 Roma, Italy, Luca Amendola, INAF/Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monte Porzio Catone (Roma), Italy |
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| 520 | |a Several experiments in the near future will test dark energy through its effects on the linear growth of matter perturbations. It is therefore important to find simple and at the same time general parametrizations of the linear growth rate. We show that a simple fitting formula that generalizes previous expressions reproduces the growth function in models that allow for a growth faster than standard, as for instance in scalar-tensor models. We use data from galaxy and Lyman-$\alpha$ power spectra to constrain the linear growth rate. We find $\gamma=0.6_{-0.3}^{+0.4}$ for the growth rate index and $\eta=0.0_{-0.2}^{+0.3}$ for the additional growth parameter we introduce. | ||
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