36 citations · 164 across the 8 of their papers we have counts for
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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…
Gravity Wormholes sourced by a Phantom Scalar Field
Thanasis Karakasis, Eleftherios Papantonopoulos, Christoforos Vlachos
We derive an exact wormhole spacetime supported by a phantom scalar field in the context of gravity. Without specifying the form of the function, the scal…
Echoes of Compact Objects in Scalar-Tensor Theories of Gravity
Christoforos Vlachos, Eleftherios Papantonopoulos, Kyriakos Destounis
Scalar-tensor theory predicts solutions to the gravitational field equations which describe compact objects in the presence of a non-minimally coupled scalar field to the Einstein…
Wormhole Solutions in Modified Brans-Dicke Theory
Eleftherios Papantonopoulos, Christoforos Vlachos
We consider a modified Brans-Dicke theory in which except the usual Brans-Dicke parameter a new dimensionful parameter appears which modifies the kinetic term of the scalar field c…