13 papers
From gravastar to central singularity
G. E. Volovik
We consider the model of the regular black hole, which demonstrates that the gravastar is thermodynamically unstable towards the Schwarzschild black hole with singularity.
Quantum and Classical mechanics vs QFT
G. E. Volovik
15 years ago Dmitry Diakonov wrote the paper "Towards lattice-regularized Quantum Gravity", arXiv:1109.0091. In his approach, gravity with metric and tetrads arise from pre-geometr…
Hawking radiation: black hole vs de Sitter
G. E. Volovik
We discuss the difference between the thermodynamics of black holes and thermodynamics of the de Sitter expansion. Both systems experience the Hawking radiation, but its impact on…
Thermodynamics of homogeneous Universes: de Sitter, Bonnor-Melvin and static Einstein
G. E. Volovik
In the theories, in which dynamic gravitational field emerges from the underlying matter fields, the gravitational field can be considered as a part of matter. Using this approach,…
Massless graviton in de Sitter as second sound in two-fluid hydrodynamics
G. E. Volovik
The concept of gravitons and their masses, clear in the case of Minkowski spacetime, remains ambiguous for de Sitter spacetime. Here, we used a two-fluid approach to de Sitter ther…
Thermodynamics of Einstein static Universe with boundary
G. E. Volovik
The de Sitter state and the static Einstein Universe are unique states that have a constant scalar Ricci curvature . It was shown earlier that such a unique symmetry of t…