31 citations · 152 across the 10 of their papers we have counts for
10 papers
Theoretical filters for shift-symmetric Horndeski gravities
Athanasios Bakopoulos, Christos Charmousis, Nikos Chatzifotis +1
We investigate the structure of nontrivial maximally symmetric vacua and compact-object solutions in shift-symmetric scalar-tensor theories. Focusing on Horndeski gravity, we deriv…
Thermodynamics of black holes featuring primary scalar hair
Athanasios Bakopoulos, Nikos Chatzifotis, Thanasis Karakasis
In this work, we embark on the thermodynamic investigation concerning a family of primary charged black holes within the context of shift and parity symmetric Beyond Horndeski grav…
Compact objects with primary hair in shift and parity symmetric beyond Horndeski gravities
Athanasios Bakopoulos, Nikos Chatzifotis, Theodoros Nakas
In this work, we delve into the model of the shift symmetric and parity-preserving Beyond Horndeski theory in all its generality. We present an explicit algorithm to extract static…
Stealth Ellis Wormholes In Horndeski theories
Athanasios Bakopoulos, Nikos Chatzifotis, Cristian Erices +1
In this work we are revisiting the well studied Ellis wormhole solution in a generalized Horndeski theory motivated from the Kaluza-Klein compactification procedure of the more fun…
On Thermal Stability of Hairy Black Holes
Nikos Chatzifotis, Panagiotis Dorlis, Nick E. Mavromatos +1
We discuss thermodynamical stability for hairy black hole spacetimes, viewed as defects in the thermodynamical parameter space, taking into account the backreaction of a secondary…
Axion induced angular momentum reversal in Kerr-like black holes
Nikos Chatzifotis, Panos Dorlis, Nick E. Mavromatos +1
We consider a pseudoscalar axion-like field coupled to a Chern-Simons gravitational anomaly term. The axion field backreacts on a rotating Kerr black hole background, resulting in…
Scalarization of Chern-Simons Kerr Black Hole Solutions and Wormholes
Nikos Chatzifotis, Panos Dorlis, Nick E. Mavromatos +1
Chern-Simons gravity rotating Kerr-type black hole solutions are revisited from the point of view of their scalarization, namely examining the back reaction of pseudoscalar axion f…
Disformal Transition of a Black Hole to a Wormhole in Scalar-Tensor Horndeski Theory
Nikos Chatzifotis, Eleftherios Papantonopoulos, Christoforos Vlachos
We consider disformal transformations in a subclass of Horndeski theory in which a scalar field is kinetically coupled to the Einstein tensor. We apply a disformal transformation o…
Stability of black holes with non-minimally coupled scalar hair to the Einstein tensor
Nikos Chatzifotis, Christoforos Vlachos, Kyriakos Destounis +1
General relativity admits a plethora of exact compact object solutions. The augmentation of Einstein's action with non-minimal coupling terms leads to modified theories with rich s…
Formation of Bound States of scalar fields in AdS-asymptotic Wormholes
Nikos Chatzifotis, George Koutsoumbas, Eleftherios Papantonopoulos
We use the Wentzel-Kramers-Brillouin (WKB) approximation to study the formation and propagation of bound states in the vicinity of a wormhole in the non-minimal derivative coupling…