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- W2000667314 abstract "We investigate whether the late-time (at $zleq 100$) velocity dispersion expected in Warm Dark Matter scenarios could have some effect on the cosmic web (i.e., outside of virialized halos). We consider effective hydrodynamical equations, with a pressurelike term that agrees at the linear level with the analysis of the Vlasov equation. Then, using analytical methods, based on perturbative expansions and the spherical dynamics, we investigate the impact of this term for a 1 keV dark matter particle. We find that the late-time velocity dispersion has a negligible effect on the power spectrum on perturbative scales and on the halo mass function. However, it has a significant impact on the probability distribution function of the density contrast at $z sim 3$ on scales smaller than $0.1 h^{-1}$Mpc, which correspond to Lyman-$alpha$ clouds. Finally, we note that numerical simulations should start at $z_igeq 100$ rather than $z_i leq 50$ to avoid underestimating gravitational clustering at low redshifts." @default.
- W2000667314 created "2016-06-24" @default.
- W2000667314 creator A5053901852 @default.
- W2000667314 date "2012-12-03" @default.
- W2000667314 modified "2023-10-18" @default.
- W2000667314 title "Impact of a warm dark matter late-time velocity dispersion on large-scale structures" @default.
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- W2000667314 doi "https://doi.org/10.1103/physrevd.86.123501" @default.
- W2000667314 hasPublicationYear "2012" @default.
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