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252 papers · 1 filter
Light rings, gravitational lensing, and ISCOs of exotic compact objects in Einstein-scalar-Maxwell theories
Antonio De Felice, Shinji Tsujikawa
In Einstein-scalar-Maxwell theories with a coupling between the scalar field and the electromagnetic field strength of the form , we investigate the existence of ex…
Exotic compact objects in Einstein-scalar-Maxwell theories
Antonio De Felice, Shinji Tsujikawa
In k-essence theories within general relativity, where the matter Lagrangian depends on a real scalar field and its kinetic term , static and spherically symmetric compact o…
Vector Horndeski black holes in nonlinear electrodynamics
Che-Yu Chen, Antonio De Felice, Shinji Tsujikawa +1
On a spherically symmetric and static background, we study the existence of linearly stable black hole (BH) solutions in nonlinear electrodynamics (NED) with a Horndeski vector-ten…
Instability of regular planar black holes in four dimensions arising from an infinite sum of curvature corrections
Antonio De Felice, Shinji Tsujikawa
In four-dimensional scalar-tensor theories derived via dimensional regularization with a conformal rescaling of the metric, we study the stability of planar black holes (BHs) whose…
Greybody factors of charged black holes with axion hair
Ratchaphat Nakarachinda, Petarpa Boonserm, Antonio De Felice +2
We study the greybody factor of charged hairy black holes (BHs) that arise due to the presence of an axion coupled to the electromagnetic field. Specifically, we consider spin-0 an…
Strong coupling and instabilities in singularity-free inflation from an infinite sum of curvature corrections
Shinji Tsujikawa
Four-dimensional gravitational theories derived from an infinite sum of Lovelock curvature invariants, combined with a conformal rescaling of the metric, are equivalent to a subcla…