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Shadow of a rotating traversable wormhole

- Petya G. Nedkova, Vassil K. Tinchev, S. Yazadjiev
- Physics
- 29 July 2013

We explore the shadow of a certain class of rotating traversable wormholes within classical general relativity. The images depend on the angular momentum of the wormhole and the inclination angle of… Expand

Image of the Janis-Newman-Winicour naked singularity with a thin accretion disk

- G. Gyulchev, Petya G. Nedkova, T. Vetsov, S. Yazadjiev
- Physics
- 13 May 2019

We study the optical appearance and the apparent radiation flux of a geometrically thin and optically thick accretion disk around the static Janis-Newman-Winicour naked singularity. We confine… Expand

Polar quasinormal modes of the scalarized Einstein-Gauss-Bonnet black holes

- J. L. Bl'azquez-Salcedo, D. Doneva, Sarah Kahlen, J. Kunz, Petya G. Nedkova, S. Yazadjiev
- Physics
- 10 June 2020

We study the polar quasinormal modes of spontaneously scalarized black holes in Einstein-Gauss-Bonnet theory. In previous works we showed that a set of nodeless solutions of the fundamental branch of… Expand

Axial perturbations of the scalarized Einstein-Gauss-Bonnet black holes

- J. L. Bl'azquez-Salcedo, D. Doneva, Sarah Kahlen, J. Kunz, Petya G. Nedkova, S. Yazadjiev
- Physics
- 15 May 2018

We study the axial perturbations of spontaneously scalarized black holes in Einstein-Gauss-Bonnet (EGB) theories. We consider the nodeless solutions of the fundamental branch of the model studied in… Expand

Charged Gauss-Bonnet black holes with curvature induced scalarization in the extended scalar-tensor theories

- D. Doneva, Stella Kiorpelidi, Petya G. Nedkova, E. Papantonopoulos, S. Yazadjiev
- Physics
- 4 September 2018

Daniela D. Doneva,1, 2, ∗ Stella Kiorpelidi,3, † Petya G. Nedkova,4, ‡ Eleftherios Papantonopoulos,3, § and Stoytcho S. Yazadjiev1, 4, 5, ¶ 1Theoretical Astrophysics, Eberhard Karls University of… Expand

On the Thermodynamics of 5D Black Holes on ALF Gravitational Instantons

- Petya G. Nedkova, S. Yazadjiev
- Physics
- 13 September 2011

We investigate the thermodynamical properties of solutions to the 5D Einstein and Einstein-Maxwell-dilaton equations describing static black holes on ALF gravitational instantons. Some general… Expand

On the shadow of rotating traversable wormholes

- G. Gyulchev, Petya G. Nedkova, Vassil K. Tinchev, S. Yazadjiev
- Physics
- 29 May 2018

We revisit the shadow of rotating traversable wormholes discussing the role of the wormhole throat in the shadow formation. For certain classes of wormholes the throat serves as a potential barrier… Expand

Uniqueness theorem for static phantom wormholes in Einstein–Maxwell-dilaton theory

- Boian V. Lazov, Petya G. Nedkova, S. Yazadjiev
- Physics
- 1 November 2017

Abstract We prove a uniqueness theorem for completely regular traversable electrically charged wormhole solutions in the Einstein–Maxwell-dilaton gravity with a phantom scalar field and a possible… Expand

Polish Doughnuts around Scalarized Kerr Black Holes

- M. C. Teodoro, L. Collodel, D. Doneva, J. Kunz, Petya G. Nedkova, S. Yazadjiev
- Physics
- 19 August 2021

In this work we aim to investigate non-mainstream thick tori configurations around Kerr Black Holes with Scalar Hair (KBHsSH). For that goal, we provide a first approach using constant specific… Expand

Image of the thin accretion disk around compact objects in the Einstein-Gauss-Bonnet gravity

- Galin G. Gyulchev, Petya G. Nedkova, T. Vetsov, S. Yazadjiev
- Physics
- 28 June 2021

We study the optical appearance of a thin accretion disk around compact objects within the Einstein-Gauss-Bonnet gravity. Considering static spherically symmetric black holes and naked singularities… Expand

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