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Matter power spectrum in f(R) gravity with massive neutrinos

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arxiv 1005.1171 v2 pith:RZLSEPB6 submitted 2010-05-07 astro-ph.CO gr-qchep-phhep-th

classification astro-ph.COgr-qchep-phhep-th
keywords matterneutrinosgravitymassivepowerspectrumanomalousclustering
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abstract

The effect of massive neutrinos on matter power spectrum is discussed in the context of $f(R)$ gravity. It is shown that the anomalous growth of density fluctuations on small scales due to the scalaron force can be compensated by free streaming of neutrinos. As a result, models which predict observable deviation of the equation-of-state parameter $w_\DE$ from $w_\DE=-1$ can be reconciled with observations of matter clustering if the total neutrino mass is $O(0.5 \eV)$.

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