30 citations · 117 across the 8 of their papers we have counts for
8 papers
Generalized unimodular gravity as a form of k-essence
A. O. Barvinsky, N. Kolganov, A. Vikman
We consider modifications of general relativity characterized by a special noncovariant constraint on metric coefficients, which effectively generates a perfect-fluid type of matte…
Dynamics of the generalized unimodular gravity theory
A. O. Barvinsky, N. Kolganov, A. Kurov +1
The Hamiltonian formalism of the generalized unimodular gravity theory, which was recently suggested as a model of dark energy, is shown to be a complicated example of constrained…
Topological Inflation
Andrey O. Barvinsky, Ariel R. Zhitnitsky
We discuss a novel scenario for early cosmology, when the inflationary quasi-de Sitter phase dynamically originates from the initial quantum state represented by the microcanonical…
On suppression of topological transitions in quantum gravity
A. O. Barvinsky
We discuss the effect of dynamical suppression for a special class of topological configurations in cosmology, which occur in Euclidean quantum gravity (EQG) when the latter is vie…
Echoing the extra dimension
A. O. Barvinsky, Sergey N. Solodukhin
We study the propagating gravitational waves as a tool to probe the extra dimensions. In the set-up with one compact extra dimension and non-gravitational physics resigning on the…
Quantum cosmology at the turn of Millennium
A. O. Barvinsky
A brief review of the modern state of quantum cosmology is presented as a theory of quantum initial conditions for inflationary scenario. The no-boundary and tunneling states of th…
Open inflation from quantum cosmology with a strong nonminimal coupling
A. O. Barvinsky
We propose the mechanism of quantum creation of the open Universe in the observable range of values of . This mechanism is based on the no-boundary quantum state with the Hawkin…
Quantum Origin of the Early Universe and the Energy Scale of Inflation
A. O. Barvinsky, A. Yu. Kamenshchik
Quantum origin of the early inflationary Universe from the no-boundary and tunnelling quantum states is considered in the one-loop approximation of quantum cosmology. A universal e…