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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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Showing 1 to 3 of 3 (0.667 seconds)

Spelling suggestions: "subject:"exact solutions off einstein equations"" "subject:"exact solutions off winstein equations""

1

Nehomogenní kosmologické modely / Inhomogeneous cosmological models

Vrba, David January 2014 (has links)
In this work we study inhomogeneous cosmological models. After a brief review of applications of inhomogeneous solutions to Einstein equations in cosmology, we give a short description of the most widely used inhomogeneous cosmological models. In the second chapter we study in detail geometrical prop- erties of the Szekeres spacetime and we are concerned with the interpretation of the metric functions in different types of geometries. In the last chapter we model inhomogeneity in Szekeres spacetime. We derive formula for the density contrast and investigate its behaviour. We also derive conditions for the density extremes that are necessary for avoiding the shell crossing singularity in Szekeres spacetime. 1
2

Prostoročasy prstencových zdrojů / Space-times of ring sources

Pešta, Milan January 2019 (has links)
Marginally outer-trapped surfaces (MOTSs) are found for a family of space-like hypersurfaces described by the Brill-Lindquist initial data. These hypersurfaces contain a singular ring characterized by its radius, mass and charge. Due to the ring character of the singularity, these surfaces are natural candidates for MOTSs with toroidal topology. By adjusting and employing the numerical method of geodesics, we indeed localize MOTSs of both spherical and toroidal topology, and compare the results with those obtained previously by Jaramillo & Lousto.
3

Topics on Gravity Outside of Four Dimensions

Bouchareb, Adel 14 September 2011 (has links) (PDF)
The thesis is divided into two loosely connected parts: the first one is concerned with three dimensional Topologically massive gravity (TMG) and the other is devoted to generating solutions of black objects within five minimal dimensional supergravity theory (mSUGRA5).
General Relativity
Supergravity
General Relativity conserved charges
Black holes
Topologically massive gravity
Solution generating techniques
Coset models
Black Rings
Exact solutions of Einstein equations
Black hole thermodynamics

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