Testing {lambda}CDM with the growth function {delta}(a): Current constraints
- Department of Physics, University of Ioannina, 45110 Ioannina (Greece)
We have compiled a data set consisting of 22 data points at a redshift range (0.15, 3.8) which can be used to constrain the linear perturbation growth rate f=(dln{delta}/dlna). Five of these data points constrain directly the growth rate f through either redshift distortions or change of the power spectrum with redshift. The rest of the data points constrain f indirectly through the rms mass fluctuation {sigma}{sub 8}(z) inferred from L{sub y}-{alpha} at various redshifts. Our analysis tests the consistency of the {lambda}CDM model and leads to a constraint of the Wang-Steinhardt growth index {gamma} [defined from f={omega}{sub m}(a){sup {gamma}}] as {gamma}=0.67{sub -0.17}{sup +0.20}. This result is clearly consistent at 1{sigma} with the value {gamma}=(6/11)=0.545 predicted by {lambda}CDM. We also apply our analysis on a new null test of {lambda}CDM which is similar to the one recently proposed by Chiba and Nakamura (arXiv:0708.3877) but does not involve derivatives of the expansion rate H(z). This also leads to the fact that {lambda}CDM provides an excellent fit to the current linear growth data.
- OSTI ID:
- 21035792
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevD.77.023504; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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