Modified gravity models and the central cusp of dark matter halos in galaxies

Abstract

The N-body dark matter (DM) simulations point that DM density profiles, e.g. the NFW halo, should be cuspy in its center, but observations disfavour this kind of DM profile. Here we consider whether the observed rotation curves "close" to the galactic centre can favour modified gravity models in comparison to the NFW halo, and how to quantify such difference. Two explicit modified gravity models are considered, MOND and a more recent approach called RGGR (in reference to Renormalization Group effects in General Relativity). It is also the purpose of this work to significantly extend the sample on which RGGR has been tested in comparison to other approaches. By analysing 62 galaxies from five samples, we find that: i) there is a radius, given by half the disk scale length, below which RGGR and MOND can match the data about as well or better than NFW, albeit the formers have fewer free parameters; ii) considering the complete rotation curve data, RGGR could achieve fits with better agreement than MOND, and almost as good as a NFW halo with two free parameters (NFW and RGGR have respectively two and one more free parameters than MOND).

arXiv comment24 pages, 7 figures, 7 tables. Accepted in MNRAS

References in corpus (52)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• Stellar mass-to-light ratios and the Tully-Fisher relation
• The Structure of Dark Matter Haloes in Dwarf Galaxies
• Cold collapse and the core catastrophe
• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• Modified Newtonian Dynamics (MOND): Observational Phenomenology and Relativistic Extensions
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• How supernova feedback turns dark matter cusps into cores
• The Core-Cusp Problem
• Modified Newtonian Dynamics as an Alternative to Dark Matter
• Cuspy No More: How Outflows Affect the Central Dark Matter and Baryon Distribution in Lambda CDM Galaxies
• H alpha rotation curves of Low Surface Brightness galaxies
• The cored distribution of dark matter in spiral galaxies
• The Baryonic Tully-Fisher Relation of Gas Rich Galaxies as a Test of LCDM and MOND
• Dark Matter Scaling Relations
• The Central Mass Distribution in Dwarf and Low Surface Brightness Galaxies
• Cosmological constant and vacuum energy: old and new ideas
• Galaxy Rotation Curves Without Non-Baryonic Dark Matter
• On the possible running of the cosmological "constant"
• On the scaling behavior of the cosmological constant and the possible existence of new forces and new light degrees of freedom
• NGC 3741: dark halo profile from the most extended rotation curve
• Effective Action of Vacuum: Semiclassical Approach
• Cosmology with Self-Adjusting Vacuum Energy Density from a Renormalization Group Fixed Point
• Running G and Λat low energies from physics at M_X: possible cosmological and astrophysical implications
• Fitting galactic rotation curves with conformal gravity and a global quadratic potential
• Testing Modified Newtonian Dynamics with Low Surface Brightness Galaxies --Rotation curve fits-
• Renormalization Group and Decoupling in Curved Space
• The dwarf galaxy DDO 47 as a dark matter laboratory: testing cusps hiding in triaxial halos
• Asymptotically Safe Inflation
• Quantum Gravity at Astrophysical Distances?
• THINGS about MOND
• The Cusp/Core problem and the Secondary Infall Model
• Dwarf Galaxy Dark Matter Density Profiles Inferred from Stellar and Gas Kinematics
• Renormalization-group running cosmologies - a scale-setting procedure
• The Dark Matter Problem in Light of Quantum Gravity
• Improved Modeling of the Mass Distribution of Disk Galaxies by the Einasto Halo Model
• Testing Modified Newtonian Dynamics with Rotation Curves of Dwarf and Low Surface Brightness Galaxies
• Exact renormalization group with optimal scale and its application to cosmology
• The running fine structure constant alpha(E) via the Adler function
• Density profile slope in Dwarfs and environment
• Are Dwarf Galaxies Dominated by Dark Matter?
• Cosmology: small scale issues revisited
• A unified solution to the small scale problems of the $\Lambda$CDM model
• One-loop corrections to the photon propagator in the curved-space QED
• Galaxy rotation curves from General Relativity with Renormalization Group corrections
• The core-cusp problem in cold dark matter halos and supernova feedback: Effects of Mass Loss
• Renormalization group scale-setting in astrophysical systems
• The Effect of a Single Supernova Explosion on the Cuspy Density Profile of a Small-Mass Dark Matter Halo
• Measurement of the Running of the Fine-Structure Constant
• Dynamics of the Laplace-Runge-Lenz vector in the quantum-corrected Newton gravity
• Elliptical galaxies kinematics within general relativity with renormalization group effects

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• Core and Halo Properties in Multi-Field Wave Dark Matter
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• Velocity dispersion of dark matter deficient ultra-diffuse galaxies: A case for modified gravity
• Low-mass disc galaxies and the issue of stability: MOND vs dark matter
• General circular velocity relation of a test particle in a 3D gravitational potential: application to the rotation curves analysis and total mass determination of UGC 8490 and UGC 9753
• A framework for creating galaxy models in the geometry of the conservation group with dark matter halos and flat rotation curves
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