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- W4377864807 abstract "Massive neutrinos are well-known to cause a characteristic suppression in the growth of structures at scales below the neutrino free-streaming length. A detailed understanding of this suppression is essential in the era of precision cosmology we are entering into, enabling us to better constrain the total neutrino mass and possibly probe (beyond)-$Lambda$CDM cosmological model(s). Instead of the usual N-body simulation or Boltzmann solver, in this article we consider a two-fluid framework at the linear scales, where the neutrino fluid perturbations are coupled to the CDM (+ baryon) fluid via gravity at redshifts of interest. Treating the neutrino mass fraction $f_nu$ as a perturbative parameter, we find a fully analytic solution to the system with redshift-dependent neutrino free-streaming length in $Lambda$CDM background. The perturbative scale-dependent solution is shown to be in excellent agreement with numerical solution of the two-fluid equations valid to all orders in $f_{nu}$, and also agrees with results from {texttt{CLASS}} to a good accuracy. We further generalize the framework to incorporate different evolving dark energy backgrounds and found sub-percent level differences in the suppression, all of which lie within the observational uncertainty of BOSS-like surveys. We also present a brief discussion on the prospects of the current analysis in the context of upcoming missions." @default.
- W4377864807 created "2023-05-24" @default.
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- W4377864807 date "2023-05-22" @default.
- W4377864807 modified "2023-10-17" @default.
- W4377864807 title "Revisiting coupled CDM-massive neutrino perturbations in diverse cosmological backgrounds" @default.
- W4377864807 doi "https://doi.org/10.48550/arxiv.2305.12830" @default.
- W4377864807 hasPublicationYear "2023" @default.
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