Wormholes and nonsingular space-times in Palatini $f(R)$ gravity

Cosimo Bambi, Alejandro Cardenas-Avendano, Gonzalo J. Olmo +1

We reconsider the problem of $f(R)$ theories of gravity coupled to Born-Infeld theory of electrodynamics formulated in a Palatini approach, where metric and connection are independ…