TY  - JOUR
AU  - Maso-Ferrando, A.
AU  - Sanchis-Gual, N.
AU  - Font, J. A.
AU  - Olmo, G. J.
PY  - 2021
DA  - 2021//
TI  - Boson stars in Palatini f(R) gravity
T2  - Class. Quantum Gravity
JO  - Classical and Quantum Gravity
SP  - 194003
EP  - 25pp
VL  - 38
IS  - 19
PB  - Iop Publishing Ltd
KW  - boson stars
KW  - Palatini formalism
KW  - modified gravity
AB  - 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.
SN  - 0264-9381
UR  - https://arxiv.org/abs/2103.15705
UR  - https://doi.org/10.1088/1361-6382/ac1fd0
DO  - 10.1088/1361-6382/ac1fd0
LA  - English
N1  - WOS:000695280300001
ID  - Maso-Ferrando_etal2021
ER  -