TY  - JOUR
AU  - Guerrero, M.
AU  - Olmo, G. J.
AU  - Rubiera-Garcia, D.
PY  - 2021
DA  - 2021//
TI  - Double shadows of reflection-asymmetric wormholes supported by positive energy thin-shells
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 066
EP  - 26pp
VL  - 04
IS  - 4
PB  - Iop Publishing Ltd
KW  - modified gravity
KW  - Wormholes
KW  - gravity
AB  - We consider reflection-asymmetric thin-shell wormholes within Palatini f(R) gravity using a matching procedure of two patches of electrovacuum space-times at a hypersurface (the shell) via suitable junction conditions. The conditions for having (linearly) stable wormholes supported by positive-energy matter sources are determined. We also identify some subsets of parameters able to locate the shell radius above the event horizon (when present) but below the photon sphere (on both sides). We illustrate with an specific example that such two photon spheres allow an observer on one of the sides of the wormhole to see another (circular) shadow in addition to the one generated by its own photon sphere, which is due to the photons passing above the maximum of the effective potential on its side and bouncing back across the throat due to a higher effective potential on the other side. We finally comment on the capability of these double shadows to seek for traces of new gravitational physics beyond that described by General Relativity.
SN  - 1475-7516
UR  - https://arxiv.org/abs/2102.00840
UR  - https://doi.org/10.1088/1475-7516/2021/04/066
DO  - 10.1088/1475-7516/2021/04/066
LA  - English
N1  - WOS:000644501000029
ID  - Guerrero_etal2021
ER  -