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Spherical Collapse in f(R) Gravity

By Alex Borisov, Bhuvnesh Jain and Pengjie Zhang


We use 1-dimensional numerical simulations to study spherical collapse in the f(R) gravity models. We include the nonlinear coupling of the gravitational potential to the scalar field in the theory and use a relaxation scheme to follow the collapse. We find an unusual enhancement in density near the virial radius which may provide observable tests of gravity. We also use the estimated collapse time to calculate the critical overdensity $\delta_c$ used in calculating the mass function and bias of halos. We find that analytical approximations previously used in the literature do not capture the complexity of nonlinear spherical collapse

Topics: Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology
Year: 2011
DOI identifier: 10.1103/PhysRevD.85.063518
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