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Title:
Cosmological simulations of normal-branch braneworld gravity
Authors:
Schmidt, Fabian
Affiliation:
AA(Theoretical Astrophysics, California Institute of Technology M/C 350-17, Pasadena, California 91125-0001, USA; Department of Astronomy & Astrophysics, The University of Chicago, Chicago, Illinois 60637-1433, USA; and Kavli Institute for Cosmological Physics, Chicago, Illinois 60637-1433, USA)
Publication:
Physical Review D, vol. 80, Issue 12, id. 123003 (PhRvD Homepage)
Publication Date:
12/2009
Origin:
APS
PACS Keywords:
Relativity and gravitation, Dark energy, Cosmology, Mathematical and relativistic aspects of cosmology
Abstract Copyright:
(c) 2009: The American Physical Society
DOI:
10.1103/PhysRevD.80.123003
Bibliographic Code:
2009PhRvD..80l3003S

Abstract

We introduce a cosmological model based on the normal branch of Dvali-Gabadadze-Porrati (DGP) braneworld gravity with a smooth dark energy component on the brane. The expansion history in this model is identical to ΛCDM, thus evading all geometric constraints on the DGP crossover scale rc. This well-defined model can serve as a first approximation to more general braneworld models whose cosmological solutions have not been obtained yet. We study the formation of large-scale structure in this model in the linear and nonlinear regime using N-body simulations for different values of rc. The simulations use the code presented in and solve the full nonlinear equation for the brane-bending mode in conjunction with the usual gravitational dynamics. The brane-bending mode is attractive rather than repulsive in the DGP normal branch, hence the sign of the modified gravity effects is reversed compared to those presented in . We compare the simulation results with those of ordinary ΛCDM simulations run using the same code and initial conditions. We find that the matter power spectrum in this model shows a characteristic enhancement peaking at &ktilde;0.7h/Mpc. We also find that the abundance of massive halos is significantly enhanced. Other results presented here include the density profiles of dark matter halos, and signatures of the brane-bending mode self-interactions (Vainshtein mechanism) in the simulations. Independently of the expansion history, these results can be used to place constraints on the DGP model and future generalizations through their effects on the growth of cosmological structure.
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