5 papers
Image of a wormhole with an arbitrary throat profile
Valeria A. Ishkaeva, Sergey V. Sushkov
We investigate the observable signatures -- the shadow, the throat silhouette, and the image of a thin accretion disk -- for a family of static, spherically symmetric wormholes wit…
Cosmological perturbations in the theory of gravity with non-minimal derivative coupling. I. Modes of perturbations
R. I. Kamalitdinov, S. V. Sushkov
We consider perturbations in the isotropic and homogeneous cosmological model with the spatially flat Friedmann-Lemaitre-Robertson-Walker metric in the framework of the theory of g…
Cosmological dynamics in the theory of gravity both with non-minimal and non-minimal derivative coupling
Ravil R. Fatykhov, Sergey V. Sushkov
This paper explores cosmological scenarios in a scalar-tensor theory of gravity, including both a non-minimal coupling with scalar curvature of the form and a non-minimal d…
Gravitational lensing by Lema\^ıtre-Tolman-Bondi wormholes in a Friedmann universe
Kirill A. Bronnikov, Valeria A. Ishkaeva, Sergey V. Sushkov
The Lema\^ıtre-Tolman-Bondi (LTB) solution to the Einstein equations describes the dynamics of a self-gravitating spherically symmetric dust cloud with an arbitrary density profil…
Neutron stars in the theory of gravity with nonminimal derivative coupling and realistic equations of state
P. E. Kashargin, A. A. Lebedev, S. V. Sushkov
We numerically construct compact stars in the scalar-tensor theory of gravity with non-minimal derivative coupling of a scalar field to the curvature and nonzero cosmological const…