Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 5 of 5 for “"Einstein-Hilbert action"”.
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The Legendre Transform of the Holst Action
… then I review the Legendre transform of the Einstein-Hilbert action and the Palatini action. The Holst action is a generalization of the Palatini action by including a topological term. I derive Ashtekar's connection form directly from this action by doing the Legendre transformation rather …
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Cosmological dynamics of exponential gravity
… on the idea of introducing corrections to the Einstein-Hilbert action that are negligible in the early Universe and only become effective at late times when the Ricci curvature R decreases. In our discussion we indicate how these corrections can be interpreted as an effective fluid of purely …
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Unusual Matter Models in Cosmology
… of the term f(TμνTμν) = α ln(λ TμνTμν) to the Einstein-Hilbert action with cosmological constant Λ. This choice of model results in constant effective inertial mass density and has an explicit exact solution of the matter energy density in terms of redshift. We look for viable cosmologies, in …
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BIANCHI-ICOSMOLOGICALMODEL IN f(R,T) GRAVITY
… itself, by imposing extra terms in the Einstein-Hilbert action (EH), or by considering dynamical candidates. These modified theories of gravity include GaussBonnet, f(G),higherderivative(HD)theories, f(R) theories, f(T) and f(R,T) gravity theories, while dynamical candidates include the …
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Stability of Einstein Manifolds
This thesis deals with Einstein metrics and the Ricci flow on compact mani- folds. We study the second variation of the Einstein-Hilbert functional on Ein- stein metrics. In the first part of the work, we find curvature conditions which ensure the stability of Einstein manifolds with respect to the …