Zoomed cosmological simulations of Milky Way sized halos in f(R)-gravity

Abstract

We investigate the impact of f(R) modified gravity on the internal properties of Milky Way sized dark matter halos in a set of cosmological zoom simulations of seven halos from the Aquarius suite, carried out with our code MG-GADGET in the Hu & Sawicki f(R) model. Also, we calculate the fifth forces in ideal NFW-halos as well as in our cosmological simulations and compare them against analytic model predictions for the fifth force inside spherical objects. We find that these theoretical predictions match the forces in the ideal halos very well, whereas their applicability is somewhat limited for realistic cosmological halos. Our simulations show that f(R) gravity significantly affects the dark matter density profile of Milky Way sized objects as well as their circular velocities. In unscreened regions, the velocity dispersions are increased by up to 40% with respect to LCDM for viable f(R) models. This difference is larger than reported in previous works. The Solar circle is fully screened in $f_{R0}=-10^{-6}$ models for Milky Way sized halos, while this location is unscreened for slightly less massive objects. Within the scope of our limited halo sample size, we do not find a clear dependence of the concentration parameter of dark matter halos on $f_{R0}$.

13 pages, 9 figures, published in MNRAS

References in corpus (19)

• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Dark torsion as the cosmic speed-up
• Dark Energy vs. Modified Gravity
• f(R) Gravity and Chameleon Theories
• Non-linear Evolution of f(R) Cosmologies III: Halo Statistics
• Equivalence Principle Implications of Modified Gravity Models
• Non-linear evolution of f(R) cosmologies I: methodology
• Dynamical Masses in Modified Gravity
• Constraining chameleon models with cosmology
• On the baryonic, stellar, and luminous scaling relations of disk galaxies
• Milky Way mass constraints from the Galactic satellite gap
• Testing the quasi-static approximation in $f(R)$ gravity simulations
• A Fast Route to Non-Linear Clustering Statistics in Modified Gravity Theories
• Halo velocity profiles in screened modified gravity theories
• Hydrodynamic Effects in the Symmetron and $f(R)$-gravity Models
• The Lyman-alpha forest in f(R) modified gravity
• Chameleon $f(R)$ gravity on the Virgo cluster scale

Cited by in corpus (18)

• The Novel Probes Project -- Tests of Gravity on Astrophysical Scales
• On the impact of $f(Q)$ gravity on the Large Scale Structure
• Weak Lensing Light-Cones in Modified Gravity simulations with and without Massive Neutrinos
• Realistic simulations of galaxy formation in f(R) modified gravity
• Speeding up $N$-body simulations of modified gravity: Chameleon screening models
• Joint halo mass function for modified gravity and massive neutrinos I: simulations and cosmological forecasts
• On the dissection of degenerate cosmologies with machine learning
• The modified gravity lightcone simulation project I: Statistics of matter and halo distributions
• Galaxy formation in the brane world I: overview and first results
• A general framework to test gravity using galaxy clusters I: Modelling the dynamical mass of haloes in $f(R)$ gravity
• A general framework to test gravity using galaxy clusters II: A universal model for the halo concentration in $f(R)$ gravity
• Imprints of Chameleon f(R) Gravity on Galaxy Rotation Curves
• Simulating galaxy formation in f(R) modified gravity: Matter, halo, and galaxy-statistics
• Accurate Computation of the Screening of Scalar Fifth Forces in Galaxies
• Fingerprints of modified gravity on galaxies in voids
• Chameleon Screening Depends on the Shape and Structure of NFW Halos
• Individual halo bias in models of $f(R)$ gravity
• Galaxy clustering in modified gravity from full-physics simulations. I: two-point correlation functions