N-body Simulations of $\gamma$ Gravity

Abstract

We have investigated structure formation in the $\gamma$ gravity $f(R)$ model with {\it N}-body simulations. The $\gamma$ gravity model is a proposal which, unlike other viable $f(R)$ models, not only changes the gravitational dynamics, but can in principle also have signatures at the background level that are different from those obtained in $\Lambda$CDM (Cosmological constant, Cold Dark Matter). The aim of this paper is to study the nonlinear regime of the model in the case where, at late times, the background differs from $\Lambda$CDM. We quantify the signatures produced on the power spectrum, the halo mass function, and the density and velocity profiles. To appreciate the features of the model, we have compared it to $\Lambda$CDM and the Hu-Sawicki $f(R)$ models. For the considered set of parameters we find that the screening mechanism is ineffective, which gives rise to deviations in the halo mass function that disagree with observations. This does not rule out the model per se, but requires choices of parameters such that $|f_{R0}|$ is much smaller, which would imply that its cosmic expansion history cannot be distinguished from $\Lambda$CDM at the background level.

arXiv comment10 pages, 8 figures, 1 table

References in corpus (61)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Is Cosmic Speed-Up Due to New Gravitational Physics?
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Testing General Relativity with Present and Future Astrophysical Observations
• Disappearing cosmological constant in f(R) gravity
• Planck 2013 results. XXII. Constraints on inflation
• Ahf: Amiga's Halo Finder
• Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
• Conditions for the cosmological viability of f(R) dark energy models
• Curvature quintessence matched with observational data
• Do consistent $F(R)$ models mimic General Relativity plus $\Lambda$?
• The pattern of growth in viable f(R) cosmologies
• f(R) Gravity and Chameleon Theories
• Cosmological Tests of Gravity
• Curing singularities in cosmological evolution of F(R) gravity
• Non-linear Evolution of f(R) Cosmologies III: Halo Statistics
• ECOSMOG: An Efficient Code for Simulating Modified Gravity
• A Singularity Problem with f(R) Dark Energy
• Exponential Gravity
• A Unified Description of Screened Modified Gravity
• Non-linear evolution of f(R) cosmologies II: power spectrum
• N-body Simulations for f(R) Gravity using a Self-adaptive Particle-Mesh Code
• Testing Gravity Against Early Time Integrated Sachs-Wolfe Effect
• Testing Gravity using Cosmic Voids
• Modified Gravity-GADGET: A new code for cosmological hydrodynamical simulations of modified gravity models
• Modified Gravity N-body Code Comparison Project
• New constraints on $f(R)$ gravity from clusters of galaxies
• On the evolution of density perturbations in f(R) theories of gravity
• Dynamical Masses in Modified Gravity
• DBI Galileons in the Einstein Frame: Local Gravity and Cosmology
• The nonlinear matter and velocity power spectra in f(R) gravity
• ISIS: a new N-body cosmological code with scalar fields based on RAMSES. Code presentation and application to the shapes of clusters
• Releasing scalar fields: cosmological simulations of scalar-tensor theories for gravity beyond the static approximation
• Cluster Density Profiles as a Test of Modified Gravity
• Structure Formation in the Symmetron Model
• Dark spinor models in gravitation and cosmology
• The XMM Cluster Survey: Testing chameleon gravity using the profiles of clusters
• Relativistic scalar fields and the quasi-static approximation in theories of modified gravity
• A clear and measurable signature of modified gravity in the galaxy velocity field
• Cosmological simulations of screened modified gravity out of the static approximation: effects on matter distribution
• Systematic simulations of modified gravity: chameleon models
• N-body Simulations for Extended Quintessence Models
• Halo modelling in chameleon theories
• Constraining $f(R)$ gravity models with disappearing cosmological constant
• Testing the quasi-static approximation in $f(R)$ gravity simulations
• On the Magnitude of Dark Energy Voids and Overdensities
• Environment Dependence of Dark Matter Halos in Symmetron Modified Gravity
• Exploring the liminality: properties of haloes and subhaloes in borderline $f(R)$ gravity
• Consistent Modified Gravity Analysis of Anisotropic Galaxy Clustering Using BOSS DR11
• Halo velocity profiles in screened modified gravity theories
• Hydrodynamic Effects in the Symmetron and $f(R)$-gravity Models
• Gas density profile in dark matter halo in chameleon cosmology
• DM haloes in the fifth-force cosmology
• Weak lensing of large scale structure in the presence of screening
• Subhaloes gone Notts: the clustering properties of subhaloes
• Constraints on Modified Gravity from Sunyaev-Zeldovich Cluster Surveys
• Revisiting the matter power spectra in $f(R)$ gravity
• Effective dark matter power spectra in $f(R)$ gravity
• $\gamma$ gravity: Steepness control

Cited by in corpus (7)

• New observational constraints on $f(R)$ gravity from cosmic chronometers
• A new test of $f(R)$ gravity with the cosmological standard rulers in radio quasars
• Gravitational wave propagation in $f(R)$ models: New parametrizations and observational constraints
• Testing f(R) gravity with the simulated data of gravitational waves from the Einstein Telescope
• Calculation of the critical overdensity in the spherical-collapse approximation
• Can background cosmology hold the key for modified gravity tests?
• Cosmological constraints on $\gamma$-gravity models