Non-linear Evolution of f(R) Cosmologies III: Halo Statistics

Abstract

The statistical properties of dark matter halos, the building blocks of cosmological observables associated with structure in the universe, offer many opportunities to test models for cosmic acceleration, especially those that seek to modify gravitational forces. We study the abundance, bias and profiles of halos in cosmological simulations for one such model: the modified action f(R) theory. In the large field regime that is accessible to current observations, enhanced gravitational forces raise the abundance of rare massive halos and decrease their bias but leave their (lensing) mass profiles largely unchanged. This regime is well described by scaling relations based on a modification of spherical collapse calculations. In the small field regime, enhanced forces are suppressed inside halos and the effects on halo properties are substantially reduced for the most massive halos. Nonetheless, the scaling relations still retain limited applicability for the purpose of establishing conservative upper limits on the modification to gravity.

12 pages, 10 figures; v2: revised version accepted by Phys. Rev. D

References in corpus (6)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• A Parameterized Post-Friedmann Framework for Modified Gravity
• Constraining f(R) Gravity as a Scalar Tensor Theory
• Non-linear evolution of f(R) cosmologies II: power spectrum
• Non-linear evolution of f(R) cosmologies I: methodology
• Self Calibration of Tomographic Weak Lensing for the Physics of Baryons to Constrain Dark Energy

Cited by in corpus (6)

• Approaches to Understanding Cosmic Acceleration
• Non-linear Evolution of Matter Power Spectrum in Modified Theory of Gravity
• Chasing the non-linear evolution of matter power spectrum with numerical resummation method: solution of closure equations
• The signature of dark energy perturbations in galaxy cluster surveys
• Three-Point Correlations in f(R) Models of Gravity
• X-ray Cluster Cosmology