Neutron stars in Scalar-Tensor-Vector Gravity
arXiv:1611.05721 · doi:10.1007/s10714-017-2184-0
Abstract
Scalar-Tensor-Vector Gravity (STVG), also referred as MOdified Gravity (MOG), is an alternative theory of the gravitational interaction. Its weak field approximation has been successfully used to described Solar System observations, galaxy rotation curves, dynamics of clusters of galaxies, and cosmological data, without the imposition of dark components. The theory was formulated by John Moffat in 2006. In this work, we derive matter-sourced solutions of STVG and construct neutron star models. We aim at exploring STVG predictions about stellar structure in the strong gravity regime. Specifically, we represent spacetime with a static, spherically symmetric manifold, and model the stellar matter content with a perfect fluid energy-momentum tensor. We then derive the modified Tolman-Oppenheimer-Volkoff equation in STVG and integrate it for different equations of state. We find that STVG allows heavier neutron stars than General Relativity (GR). Maximum masses depend on a normalized parameter that quantifies the deviation from GR. The theory exhibits unusual predictions for extreme values of this parameter. We conclude that STVG admits suitable spherically symmetric solutions with matter sources, relevant for stellar structure. Since recent determinations of neutron stars masses violate some GR predictions, STVG appears as a viable candidate for a new gravity theory.
The final publication is available at Springer via http://dx.doi.org/10.1007/s10714-017-2184-0
References in corpus (19)
- Shapiro delay measurement of a two solar mass neutron star
- A Massive Pulsar in a Compact Relativistic Binary
- Dark Matter Results from 225 Live Days of XENON100 Data
- Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XII: Stiffness and stability of neutron-star matter
- Search for Low-Mass WIMPs with SuperCDMS
- Black Holes in Modified Gravity (MOG)
- Inner crust of neutron stars with mass-fitted Skyrme functionals
- Analytical representations of unified equations of state of neutron-star matter
- Slowly rotating neutron and strange stars in gravity
- The Bullet Cluster 1E0657-558 evidence shows Modified Gravity in the absence of Dark Matter
- Stability of spherically symmetric solutions in modified theories of gravity
- Structure of neutron stars in R-squared gravity
- Fundamental parameter-free solutions in Modified Gravity
- Rapidly rotating neutron stars in -squared gravity
- Can TeVeS avoid Dark Matter on galactic scales?
- Black holes and neutron stars in the generalized tensor-vector-scalar theory
- Slowly Rotating Relativistic Stars in Tensor-Vector-Scalar Theory
- Stability and Quasinormal Modes of Black holes in Tensor-Vector-Scalar theory: Scalar Field Perturbations
- Spherically symmetric electromagnetic mass models of embedding class one