269 citations · 1.2k across the 15 of their papers we have counts for
14 papers
On the Energy Issue for a Class of Modified Higher Order Gravity Black Hole Solutions
Guido Cognola, Olesya Gorbunova, Lorenzo Sebastiani +1
In the case of a large class of static spherically symmetric black hole solutions in higher order modified gravity models, an expression for the associated energy is proposed and i…
On Isotropic Turbulence in the Dark Fluid Universe
Iver Brevik, Olesya Gorbunova, Shin'ichi Nojiri +1
As first part of this work, experimental information about the decay of isotropic turbulence in ordinary hydrodynamics, u^2(t) proportional to t^{-6/5}, is used as input in FRW equ…
Viscous Fluids and Gauss-Bonnet Modified Gravity
Olesya Gorbunova, Lorenzo Sebastiani
We study effects of cosmic fluids on finite-time future singularities in modified -gravity, where and are the Ricci scalar and the Gauss-Bonnet invariant, respectiv…
The oscillating dark energy and cosmological Casimir effect
Olesya Gorbunova, Diego Sáez-Gómez
The role of dynamical cosmological Casimir effect to phantom (constant ) and oscillating Universe is discussed. It is shown explicitly that its role is not essential near to Big…
Casimir Effects Near the Big Rip Singularity in Viscous Cosmology
Iver Brevik, Olesya Gorbunova, Diego Saez-Gomez
Analytical properties of the scalar expansion in the cosmic fluid are investigated, especially near the future singularity, when the fluid possesses a constant bulk viscosity ζ. In…
Dark energy with time-dependent equation of state
O. G. Gorbunova, A. V. Timoshkin
The accelerating Friedmann flat universe, filled with an ideal fluid with a linear (oscillating) inhomogeneous equation of state (EoS) depending on time, is reviewed. The equations…