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Stability criterion for white dwarfs in Palatini f(R) gravity

Nov 15, 2021

12 pages

Published in:

Phys.Rev.D 105 (2022) 2, 024028

Published: Jan 7, 2022

e-Print:

2111.08029 [gr-qc]

DOI:

10.1103/PhysRevD.105.024028 (publication)

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Abstract: (APS)

Recent observations of several peculiar over- and underluminous type Ia supernovae infer indirect evidence for the violation of the Chandrasekhar mass limit by suggesting the existence of super- and sub-Chandrasekhar limiting mass white dwarfs. In an attempt to explain these phenomena in the context of general relativistic extensions, we study these objects in Palatini

f (R)

gravity. We obtain the super- and sub-Chandrasekhar limiting masses as well as the dynamical instability criteria for white dwarfs in the given gravitational theory. We further demonstrate that the conventional positivity condition

\partial M / \partial ρ_{c} > 0

with

M

being the WD’s mass with central density

ρ_{c}

is also a valid criterion for stability in Palatini gravity.

Note:

12 pages with 4 figures; version accepted for publication in Phys. Rev. D

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