Testing MOG, Non-Local Gravity and MOND with rotation curves of dwarf galaxies

Abstract

Modified Gravity (MOG) and Non-Local Gravity (NLG) are two alternative theories to General Relativity. They are able to explain the rotation curves of spiral galaxies and clusters of galaxies without including dark matter (Moffat & Rahvar 2013, 2014; Rahvar & Mashhoon 2014). In the weak-field approximation these two theories have similar forms, with an effective gravitational potential that has two components: (i) Newtonian gravity with the gravitational constant enhanced by a factor $(1+\alpha )$ and (ii) a Yukawa type potential that produces a repulsive force with length scale $1/\mu$. In this work we compare the rotation curves of dwarf galaxies in the LITTLE THINGS catalog with predictions of MOG, NLG and Modified Newtonian Dynamics (MOND). We find that the universal parameters of these theories, can fit the rotation curve of dwarf galaxies with a larger stellar mass to the light ratio compared to the nearby stars in the Milky Way galaxy. Future direct observations of mass function of stars in the dwarf galaxies can examine different modified gravity models.

References in corpus (10)

• The teleparallel equivalent of general relativity
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• On the Proof of Dark Matter, the Law of Gravity and the Mass of Neutrinos
• Nonlocal Gravity Simulates Dark Matter
• Fundamental parameter-free solutions in Modified Gravity
• An Alternative to Particle Dark Matter
• Observational Tests of Nonlocal Gravity: Galaxy Rotation Curves and Clusters of Galaxies
• Neutrinos as cluster dark matter
• MOND and the lensing Fundamental Plane: No need for dark matter on galaxy scales
• Testing modified gravity with dwarf spheroidal galaxies

Cited by in corpus (14)

• Dark matters on the scale of galaxies
• Propagation of Electromagnetic Waves in MOG: Gravitational Lensing
• Harvesting energy driven by Comisso-Asenjo process from Kerr-MOG black holes
• On the gravitational instability in the Newtonian limit of MOG
• Testing MOG theory in the Milky Way
• Testing Modified Gravity theory (MOG) with Type Ia Supernovae, Cosmic Chronometers and Baryon Acoustic Oscillations
• The GMRT archive atomic gas survey -- II. Mass modelling and dark matter halo properties across late-type spirals
• Modified gravity (MOG) and the cluster Abell 1689 acceleration data
• Type I shell galaxies as a test of gravity models
• Acceleration in Modified Gravity (MOG) and the Mass-Discrepancy Baryonic Relation
• Formation and Growth of the First Supermassive Black Holes in MOG
• Dynamics of Dwarf Galaxies in Scalar-Tensor-Vector-Gravity
• The Weak Lensing Mass of Cosmic Web Filaments and Modified Gravity (MOG)
• Dwarf galaxies in non-local gravity