Gravitational Theory of Cosmology, Galaxies and Galaxy Clusters

Abstract

A modified gravitational theory explains early universe and late time cosmology, galaxy and galaxy cluster dynamics. The modified gravity (MOG) theory extends general relativity (GR) by three extra degrees of freedom: a scalar field $G$, enhancing the strength of the Newtonian gravitational constant $G_N$, a gravitational, spin 1 vector graviton field ${\varphi }_{\mu }$, and the effective mass $\mu$ of the ultralight spin 1 graviton. For $t<t_{\mathrm{rec}}$, where $t_{\mathrm{rec}}$ denotes the time of recombination and re-ionization, the density of the vector graviton ${\rho }_{\varphi }>{\rho }_b$, where ${\rho }_b$ is the density of baryons, while for $t>t_{\mathrm{rec}}$ we have ${\rho }_b>{\rho }_{\varphi }$. The matter density is parameterized by ${\Omega }_M={\Omega }_b+{\Omega }_{\varphi }+{\Omega }_r$ where ${\Omega }_r={\Omega }_{\gamma }+{\Omega }_{\nu }$. For the cosmological parameter values obtained by the Planck Collaboration, the CMB acoustical oscillation power spectrum, polarization and lensing data can be fitted as in the $\Lambda$CDM model. When the baryon density ${\rho }_b$ dominates the late time universe, MOG explains galaxy rotation curves, the dynamics of galaxy clusters, galaxy lensing and the galaxy clusters matter power spectrum without dominant dark matter.

9 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:1409.0853, arXiv:1510.07037

References in corpus (10)

• Ultralight scalars as cosmological dark matter
• The Bullet Cluster 1E0657-558 evidence shows Modified Gravity in the absence of Dark Matter
• Testing modified gravity with globular cluster velocity dispersions
• Fundamental parameter-free solutions in Modified Gravity
• Dark matters on the scale of galaxies
• The Search for Dark Matter
• Jeans analysis in modified gravity
• Modified Gravity (MOG) fits to observed radial acceleration of SPARC galaxies
• Test particle motion in modified gravity theories
• Testing MOdified Gravity (MOG) theory and dark matter model in Milky Way using the local observables

Cited by in corpus (8)

• MOG cosmology without dark matter and the cosmological constant
• Harvesting energy driven by Comisso-Asenjo process from Kerr-MOG black holes
• Applying Modified Gravity (MOG) to the Lensing and Einstein Ring in Abell 3827
• The cosmological background and the "external field" in Modified Gravity (MOG)
• Moffat's Modified Gravity tested on X-COP galaxy clusters
• External Field Effect in Gravity
• Formation and Growth of the First Supermassive Black Holes in MOG
• Implications of the Milky Way Declining Rotation Curve