6 papers
Multi-scalar Gauss-Bonnet gravity -- hairy black holes and scalarization
Daniela D. Doneva, Kalin V. Staykov, Stoytcho S. Yazadjiev +1
In the present paper we consider multi-scalar extension of Einstein-Gauss-Bonnet gravity. We focus on multi-scalar Einstein-Gauss-Bonnet models whose target space is a three-dimens…
Thermodynamic Stability of the Stationary Lifshitz Black Hole of New Massive Gravity
K. Kolev, K. Staykov, T. Vetsov
In this paper we investigate the thermodynamic properties of the stationary Lifshitz black hole solution of New Massive Gravity. We study the thermodynamic stability from local and…
Gauss-Bonnet black holes with a massive scalar field
Daniela D. Doneva, Kalin V. Staykov, Stoytcho S. Yazadjiev
In the present paper we consider the extended scalar-tensor-Gauss-Bonnet gravity with a massive scalar field. We prove numerically the existence of Gauss-Bonnet black holes for thr…
Orbital and epicyclic frequencies in massive scalar-tensor theory with self-interaction
Kalin V. Staykov, Daniela D. Doneva, Stoytcho S. Yazadjiev
Testing modified theories of gravity with direct observations of the parameters of a neutron star is not the optimal way of testing gravitational theories. However, observing elect…
Moment of inertia - mass universal relations for neutron stars in scalar-tensor theory with self-interacting massive scalar field
Dimitar Popchev, Kalin V. Staykov, Daniela D. Doneva +1
We are investigating universal relations between different normalisations of the moment of inertia and the compactness of neutron stars in slow rotation approximation. We study the…
Moment of inertia -- compactness universal relations in scalar-tensor theories and gravity
Kalin V. Staykov, Daniela D. Doneva, Stoytcho S. Yazadjiev
We are investigating universal relations between different normalisations of the moment of inertia and the compactness of neutron and strange stars. Slowly rotating as well as rapi…