3 results match your criteria: "Center for Gravitation and Fundamental Metrology[Affiliation]"
On stable exponential cosmological solutions with two factor spaces in (1+ m + 2)-dimensional Einstein-Gauss-Bonnet model with -term.
Philos Trans A Math Phys Eng Sci
May 2022
Institute for Nuclear Research of the Russian Academy of Sciences, Troitsk, Moscow, 142190, Russian Federation.
Article Synopsis
- The study explores a multidimensional Einstein-Gauss-Bonnet gravitational model, focusing on the interplay between its Gauss-Bonnet and cosmological terms.
- It presents exact solutions characterized by exponential time dependence in two scale factors, linked to distinct Hubble-like parameters based on different dimensions.
- Stability analysis indicates that under specific conditions, these solutions maintain stability, especially within a subset with minor variations in the effective gravitational constant.
Some unusual wormholes in general relativity.
Philos Trans A Math Phys Eng Sci
May 2022
Center for Gravitation and Fundamental Metrology, VNIIMS, Ozyornaya ul. 46, Moscow 119361, Russia.
In this short review, we present some recently obtained traversable wormhole models in the framework of general relativity (GR) in four and six dimensions that somehow widen our common ideas on wormhole existence and properties. These are, first, rotating cylindrical wormholes, asymptotically flat in the radial direction and existing without exotic matter. The topological censorship theorems are not violated due to lack of asymptotic flatness in all spatial directions.
View Article and Find Full Text PDFRegular phantom black holes.
Phys Rev Lett
June 2006
Center for Gravitation and Fundamental Metrology, VNIIMS, 46 Ozyornaya Street, Moscow 119361, Russia.
We study self-gravitating, static, spherically symmetric phantom scalar fields with arbitrary potentials (favored by cosmological observations) and single out 16 classes of possible regular configurations with flat, de Sitter, and anti-de Sitter asymptotics. Among them are traversable wormholes, bouncing Kantowski-Sachs (KS) cosmologies, and asymptotically flat black holes (BHs). A regular BH has a Schwarzschild-like causal structure, but the singularity is replaced by a de Sitter infinity, giving a hypothetic BH explorer a chance to survive.
View Article and Find Full Text PDF