176 citations · 3.9k across the 153 of their papers we have counts for
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Study of Null Geodesics and their Stability in Kalb-Ramond Black Holes
P. A. González, Marco Olivares, Eleftherios Papantonopoulos +1
We investigate null geodesics and their stability in four-dimensional charged Kalb-Ramond black holes with a cosmological constant. The non-vanishing vacuum expectation value of th…
21-cm Brightness Temperature in a Unified-Dark-Sector Horndeski Theory
Bertha Cuadros-Melgar, Thanasis Karakasis, Eleftherios Papantonopoulos +1
We investigate the impact of scalar-tensor theories on the 21cm brightness temperature. We consider a specific model in Horndeski scalar-tensor theory in which dark matter and dark…
Binary Black Hole Coalescence and the Dynamics of Scalar Hair in Einstein-Maxwell-Scalar Theory
Jean Pierre Díaz, P. A. González, Eleftherios Papantonopoulos +1
We investigate the head-on coalescence of charged binary black holes in Einstein-Maxwell-Scalar (EMS) theory using numerical relativity. The binaries are built from charged punctur…
Thermal Stability and QNMs of a Hairy Black Hole in the Presence of a Monopole Field
George Koutsoumbas, Andri Machattou, Eleftherios Papantonopoulos
We study the stability of a generalization of the GHS-GM black hole in the presence of a dilaton and a monopole field. We find that the thermal behaviour of system depends on the s…
Timelike Geodesics of Regular Black Holes with Scalar Hair
P. A. González, Marco Olivares, Eleftherios Papantonopoulos +1
We investigate timelike geodesics in asymptotically flat regular black holes supported by a phantom scalar field characterized by a scalar charge . This parameter removes the ce…
Anomalous Decay Rate and Greybody Factors for Regular Black Holes with Scalar Hair
Ramón Bécar, P. A. González, Eleftherios Papantonopoulos +1
We study the propagation of massive scalar fields in the background of asymptotically flat regular black holes supported by a phantom scalar field with a scalar charge . This pa…