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Identifier

000380672

Title

Horava - Lifshitz gravity and Mirage cosmology

Alternative Title

Βαρύτητα Horava - Lifshitz και Mirage κοσμολογία

Author

Ρουμπεδάκης, Κωνσταντίνος

Thesis advisor

Κυρίτσης, Ηλίας

Abstract

In the first part, we discuss the static and spherically symmetric solutions with zero shift vector, of the low energy Horava-Lifshitz gravity. We begin with a brief introduction to Horava-Lifshitz gravity, originally introduced in 2009 by Petr Horava. We continue with the construction of the most general power-counting renormalizable theory with anisotropic scaling. Then, we compute the large distance asymtpotics of the metric-fields, where for simplicity, we concentrate on the low energy effective action of the theory. Finally, we compare the results with those of General Relativity. In the second part, our three-dimensional space is treated as a hyper-surface in a ten-dimensional static and spherically symmetric background space. Due to its motion, we observe an effective cosmological evolution that we compute. Using Freedmann's equations, we define the effective matter density that would produce the observed cosmological evolution in the context of General Relativity. Then, we apply the results in the case of the AdS5xS5 black hole background space. We calculate the asymptotics of the effective matter density and we show that for large distances, from the center of the AdS black hole, it takes a constant value. Therefore, we conclude that the motion of our three-dimensional space in the ten-dimensional background could be the origin of dark energy. Lastly we generalize the results for a wide case of background metrics.

Language

English

Subject

Brane cosmology

Issue date

2013-07-19

Collection

School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses

Type of Work--Post-graduate theses

Views

686

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