RT Journal Article
T1 Minimum main sequence mass in quadratic Palatini f(R) gravity
A1 Olmo, Gonzalo J.
A1 Rubiera García, Diego
A1 Wojnar, Aneta
AB 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.
PB Amer Physical Soc
SN 2470-0010
YR 2019
FD 2019
LK https://hdl.handle.net/20.500.14352/13727
UL https://hdl.handle.net/20.500.14352/13727
LA eng
NO © 2019 American Physical Society.G. J. O. is funded by the Ramon y Cajal Contract No. RYC-2013-13019 (Spain). D. R. G. is funded by the Atraccion de Talento Investigador programme of the Comunidad de Madrid (Spain) Program No. 2018-T1/TIC-10431, and acknowledges further support from the Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) research Projects No. UID/FIS/04434/2013, No. PTDC/FIS-OUT/29048/2017, and No. PTDC/FIS-PAR/31938/2017. A. W. acknowledges financial support from FAPES (Brazil). This work is supported by the Spanish Projects No. FIS2014-57387-C3-1-P and No. FIS2017-84440-C2-1-P (MINECO/FEDER, EU), the Project No. H2020-MSCA-RISE-2017 Grant No. FunFiCO-777740, the Project No. SEJI/2017/042 (Generalitat Valenciana), the Consolider Program No. CPANPHY-1205388, the Severo Ochoa Grant No. SEV-2014-0398 (Spain) and the Edital 006/2018 PRONEX (FAPESQ-PB/CNPQ, Brazil) and the EU COST Actions CA15117 and CA18108. D. R. G. and A. W. thank the Department of Physics and IFIC of the University of Valencia for their hospitality during different stages of the elaboration of this work.
NO Unión Europea. H2020
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Comunidad de Madrid
NO Generalitat Valenciana
NO Programa Ramón y Cajal
NO Centro de Excelencia Severo Ochoa
NO Fundação para a Ciência e a Tecnologia (FCT)
NO Centro Nacional de Física de Partículas, Astropartículas y Nuclear (CPAN)
DS Docta Complutense
RD 21 dic 2025