5 papers
Topological Black Holes with curvature induced scalarization in the extended scalar-tensor theories
Stella Kiorpelidi, George Koutsoumbas, Andri Machattou +1
We study the perturbative behaviour of topological black holes in the presence of a cosmological constant and a scalar field coupled to the Gauss-Bonnet term. We calculate both ana…
Cosmological perturbations in modified teleparallel gravity models: Boundary term extension
Sebastian Bahamonde, Viktor Gakis, Stella Kiorpelidi +3
Teleparallel gravity offers a new avenue in which to construct gravitational models beyond general relativity. While teleparallel gravity can be framed in a way to be dynamically e…
Spontaneous Holographic Scalarization of Black Holes in Einstein-Scalar-Gauss-Bonnet Theories
Hong Guo, Stella Kiorpelidi, Xiao-Mei Kuang +3
We holographically investigate the scalarization in the Einstein-Scalar-Gauss-Bonnet gravity with a negative cosmological constant. We find that instability exists for both Schwarz…
Charged Gauss-Bonnet black holes with curvature induced scalarization in the extended scalar-tensor theories
Daniela D. Doneva, Stella Kiorpelidi, Petya G. Nedkova +2
Recently new scalarized black hole solutions were constructed in the extended scalar-tensor-Gauss-Bonnet gravity, where the scalar field is sourced by the curvature of the spacetim…
Superradiance Effect of a Black Hole Immersed in an Expanding Universe
Stella Kiorpelidi, Konstantinos Ntrekis, Eleftherios Papantonopoulos
We studied the superradiance effect of a charge black hole immersed in an expanding Universe. We considered a test massive charged scalar field scattered off the horizon of the cha…