Using mock galaxy catalogs, the authors show that a single halo velocity bias parameter can recover cosmological parameters when assembly bias is modeled, and that it deviates from unity for strong modified gravity models.
Cosmological restrictions for two DGP branes in a bulk with compactified extra dimension
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abstract
We investigate the cosmological consequences of a two brane system embedded in a higher dimensional background spacetime with a compactified extra dimension described with an action that include the intrinsic curvature for each brane. We find that the dynamics of each brane is related to the other by means of cosmological restrictions that involve the scale factors, the equation of state parameters and the Hubble parameters of the two branes. We analyze the evolution of the scale factor and the equation of state parameter for the hidden brane when in the visible brane is present a cosmological constant, radiation or non-relativistic matter. The topological restrictions give rise to the cosmological scenarios without initial singularity, recollapsing and oscillating universes.
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Exploring the signature of assembly bias and modified gravity using small-scale clusterings of galaxies
Using mock galaxy catalogs, the authors show that a single halo velocity bias parameter can recover cosmological parameters when assembly bias is modeled, and that it deviates from unity for strong modified gravity models.