Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Mengual, Salvador"'
Publikováno v:
Class. Quantum Grav. 41 (2024) 205013
The necessary and sufficient conditions for a perfect fluid solution to define a spatially-homogeneous cosmology are achieved. These conditions are Intrinsic, Deductive, Explicit and ALgorithmic, and they offer an IDEAL labeling of these geometries.
Externí odkaz:
http://arxiv.org/abs/2409.15854
Publikováno v:
Phys. Rev. D 110, 044012 (2024)
The thermodynamic interpretation of the Stephani Universes is studied in detail. The general expression of the speed of sound and of the thermodynamic schemes associated with a thermodynamic solution is obtained. The constraints imposed on the soluti
Externí odkaz:
http://arxiv.org/abs/2409.01852
Publikováno v:
Class. Quantum Grav. 40 205020 (2023)
The necessary and sufficient conditions for a spacetime with an invariant frame to admit a group of isometries of dimension $r$ are given in terms of the connection tensor $H$ associated with this frame. In Petrov-Bel types I, II and III, and in othe
Externí odkaz:
http://arxiv.org/abs/2309.14100
Publikováno v:
Class.Quant.Grav. 40 (2023) 17, 175003
The necessary and sufficient conditions are obtained for a unit time-like vector field $u$ to be the unit velocity of a divergence-free perfect fluid energy tensor. This plainly kinematic description of a conservative perfect fluid requires consideri
Externí odkaz:
http://arxiv.org/abs/2309.00463
Publikováno v:
Phys. Rev. D 106 (2022) 124032
The necessary and sufficient conditions for a perfect energy tensor to describe the energy evolutions of a monoatomic relativistic Synge gas are obtained. Then, a Rainich-like theory for the Einstein-Synge solutions can be constructed. Equations of s
Externí odkaz:
http://arxiv.org/abs/2212.00591
Publikováno v:
Phys. Rev. D 105 (2022) 124019
We analyze the interpretation of the spherically symmetric perfect fluid solutions that admit a flat synchronization orthogonal to the fluid flow as a thermodynamic perfect fluid in local thermal equilibrium. The ideal gas sonic condition is examined
Externí odkaz:
http://arxiv.org/abs/2204.12901
Publikováno v:
Phys. Rev. D 104 (2021) 064029
We analyze the field equations for the perfect fluid solutions admitting a group G$_3$ of isometries acting on orbits S$_2$ whose curvature has a gradient that is tangent to the fluid flow (T-models). We propose several methods to integrate the field
Externí odkaz:
http://arxiv.org/abs/2109.07136
Publikováno v:
Phys. Rev. D 104 (2021) 024038
The perfect fluid solutions admitting a group G$_3$ of isometries acting on orbits S$_2$ whose curvature has a gradient which is tangent to the fluid flow (T-models) are studied from a thermodynamic approach. All the admissible thermodynamic schemes
Externí odkaz:
http://arxiv.org/abs/2106.01015
The explicit expression of the multiple Debever null directions of an algebraically special spacetime are obtained in terms of the electric and magnetic parts of the Weyl tensor. An algorithm for the determination of the Petrov-Bel type and the algor
Externí odkaz:
http://arxiv.org/abs/2103.06158
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