%0 Journal Article
%T Boson stars in Palatini f(R) gravity
%A Maso-Ferrando, A.
%A Sanchis-Gual, N.
%A Font, J. A.
%A Olmo, G. J.
%J Classical and Quantum Gravity
%D 2021
%V 38
%N 19
%I Iop Publishing Ltd
%@ 0264-9381
%G English
%F Maso-Ferrando_etal2021
%O WOS:000695280300001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4964), last updated on Wed, 22 Sep 2021 09:02:07 +0000
%X We explore equilibrium solutions of spherically symmetric boson stars in the Palatini formulation of f (R) gravity. We account for the modifications introduced in the gravitational sector by using a recently established correspondence between modified gravity with scalar matter and general relativity with modified scalar matter. We focus on the quadratic theory f (R) = R + xi R-2 and compare its solutions with those found in general relativity, exploring both positive and negative values of the coupling parameter xi. As matter source, a complex, massive scalar field with and without self-interaction terms is considered. Our results show that the existence curves of boson stars in Palatini f (R) gravity are fairly similar to those found in general relativity. Major differences are observed for negative values of the coupling parameter which results in a repulsive gravitational component for high enough scalar field density distributions. Adding self-interactions makes the degeneracy between f (R) and general relativity even more pronounced, leaving very little room for observational discrimination between the two theories.
%K boson stars
%K Palatini formalism
%K modified gravity
%R 10.1088/1361-6382/ac1fd0
%U https://arxiv.org/abs/2103.15705
%U https://doi.org/10.1088/1361-6382/ac1fd0
%P 194003-25pp