TY  - JOUR
AU  - Afonso, V. I.
AU  - Olmo, G. J.
AU  - Orazi, E.
AU  - Rubiera-Garcia, D.
PY  - 2019
DA  - 2019//
TI  - New scalar compact objects in Ricci-based gravity theories
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 044
EP  - 20pp
VL  - 12
IS  - 12
PB  - Iop Publishing Ltd
KW  - modified gravity
KW  - gravity
KW  - GR black holes
KW  - Wormholes
AB  - Taking advantage of a previously developed method, which allows to map solutions of General Relativity into a broad family of theories of gravity based on the Ricci tensor (Ricci-based gravities), we find new exact analytical scalar field solutions by mapping the free-field static, spherically symmetric solution of General Relativity (GR) into quadratic f(R) gravity and the Eddington-inspired Born-Infeld gravity. The obtained solutions have some distinctive feature below the would-be Schwarzschild radius of a configuration with the same mass, though in this case no horizon is present. The compact objects found include wormholes, compact balls, shells of energy with no interior, and a new kind of object which acts as a kind of wormhole membrane. The latter object has Euclidean topology but connects antipodal points of its surface by transferring particles and null rays across its interior in virtually zero affine time. We point out the relevance of these results regarding the existence of compact scalar field objects beyond General Relativity that may effectively act as black hole mimickers.
SN  - 1475-7516
UR  - https://arxiv.org/abs/1906.04623
UR  - https://doi.org/10.1088/1475-7516/2019/12/044
DO  - 10.1088/1475-7516/2019/12/044
LA  - English
N1  - WOS:000507261900041
ID  - Afonso_etal2019
ER  -