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Olmo, Gonzalo J. and Rubiera Garcia, Diego and Wojnar, Aneta
(2019)
*Minimum main sequence mass in quadratic Palatini f(R) gravity.*
Physical review D, 100
(4).
ISSN 2470-0010

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Official URL: http://dx.doi.org/10.1103/PhysRevD.100.044020

## Abstract

General relativity yields an analytical prediction of a minimum required mass of roughly similar to 0.08-0.09 M-circle dot 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(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(R) gravity parameter and the central density according to astrophysical observations.

Item Type: | Article |
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Additional Information: | © 2019 American Physical Society. |

Uncontrolled Keywords: | Stars |

Subjects: | Sciences > Physics > Physics-Mathematical models Sciences > Physics > Mathematical physics |

ID Code: | 57487 |

Deposited On: | 29 Oct 2019 13:20 |

Last Modified: | 18 Mar 2021 10:28 |

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