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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Observational aspects of a massive graviton
 Křížová, Radka ; Urban, Federico (advisor) ; Carloni, Sante (referee)
The possible existence of a massive spin-2 field alongside the standard massless gravi- ton of General Relativity is a recent theoretical development in gravitational physics. If such an additional tensor field exists, it could leave potentially observable imprints in several astrophysical, cosmological and laboratory settings. This thesis studies the phe- nomenon of flavour oscillations in a nearly degenerate coupled system of photons with massive and massless spin-2 particles propagating in an external magnetic field. The framework for our calculations is provided by the ghost-free bimetric theory of gravity coupled to electromagnetism. We discuss several potentially observable manifestations of such oscillations and make numerical predictions for some relevant laboratory setups and astrophysical scenarios.
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Inhomogeneous cosmology and averaging methods
 Kašpar, Petr ; Svítek, Otakar (advisor) ; Balek, Vladimír (referee) ; Carloni, Sante (referee)
In this work we have examined different methods of averaging in general relativity and cosmology. We developed the method based on Cartan scalars. We computed the backreaction term for a flat LTB model with a special ansatz for the radial function. We found out that it behaves as a positive cosmological constant. In the next part of this thesis we were interested in averaging inside LRS class II dust model. For this family we averaged all the Einstein equations and the resulting system generalizes the Buchert equations. We numerically worked out two concrete examples where deceleration parameter changes its sign from positive to negative. Powered by TCPDF (www.tcpdf.org)
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