6533b82efe1ef96bd12944ee
RESEARCH PRODUCT
Minimum main sequence mass in quadratic Palatini f(R) gravity
Diego Rubiera-garciaAneta WojnarGonzalo J. OlmoGonzalo J. Olmosubject
PhysicsSequenceGravity (chemistry)010308 nuclear & particles physicsGeneral relativityBrown dwarfOrder (ring theory)01 natural scienceslaw.inventionQuadratic equationlaw0103 physical sciencesf(R) gravityHydrostatic equilibrium010306 general physicsMathematical physicsdescription
General relativity yields an analytical prediction of a minimum required mass of roughly $\ensuremath{\sim}0.08--0.09\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ for a star to stably burn sufficient hydrogen to fully compensate photospheric losses and, therefore, to belong to the main sequence. Those objects below this threshold (brown dwarfs) eventually cool down without any chance to stabilize their internal temperature. In this work we consider quadratic Palatini $f(\mathcal{R})$ gravity and show that the corresponding Newtonian hydrostatic equilibrium equation contains a new term whose effect is to introduce a weakening/strengthening of the gravitational interaction inside astrophysical bodies. This fact modifies the general relativity prediction for this minimum main sequence mass. Through a crude analytical modeling we use this result in order to constraint a combination of the quadratic $f(\mathcal{R})$ gravity parameter and the central density according to astrophysical observations.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-08-12 | Physical Review D |