36 citations · 164 across the 8 of their papers we have counts for
9 papers
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…
Ion acceleration by an ultrashort laser pulse interacting with a near-critical-density gas jet
M. Ehret, C. Salgado-Lopez, V. Ospina-Bohorquez +28
We demonstrate laser-driven Helium ion acceleration with cut-off energies above 25 MeV and peaked ion number above /MeV for 22(2) MeV projectiles from near-critical density…
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…
Bio-Inspired Resource Allocation for Relay-Aided Device-to-Device Communications
Christoforos Vlachos, Hisham Elshaer, Jian Chen +2
The Device-to-Device (D2D) communication principle is a key enabler of direct localized communication between mobile nodes and is expected to propel a plethora of novel multimedia…
Optimal Virtualized Inter-Tenant Resource Sharing for Device-to-Device Communications in 5G Networks
Christoforos Vlachos, Vasilis Friderikos, Mischa Dohler
Device-to-Device (D2D) communication is expected to enable a number of new services and applications in future mobile networks and has attracted significant research interest over…
Interference-Aware Decoupled Cell Association in Device-to-Device based 5G Networks
Hisham Elshaer, Christoforos Vlachos, Vasilis Friderikos +1
Cell association in cellular networks is an important aspect that impacts network capacity and eventually quality of experience. The scope of this work is to investigate the differ…