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 10 of 10 for “"alternative theories of gravity"”.
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Neutron Star Models in Alternative Theories of Gravity
<p>We study the structure of neutron stars in a broad class of alternative theories of gravity. In particular, we focus on Scalar-Tensor theories and <italic>f(R)<italic> theories of gravity. We construct static and slowly rotating numerical star models for a set of equations of state, including a …
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Alternative theories of gravity and their application to cosmology
In this thesis we study extended theories of gravity in the context of cosmology. The first part is dedicated to the application of the theory of dynamical systems, which allow us to investigate the global dynamics of some cosmological models resulting from scalar-tensor and higher-order theories …
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Gravitational Waves and Inspiraling Compact Binaries in Alternative Theories of Gravity
<p>This dissertation consists of four parts. In Part I, we briefly review fundamental theories of gravity, performed experimental tests, and gravitational waves. The framework and the methods that we use in our calculations are discussed in Part II. This part includes reviewing the methods of the …
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New aspects of black hole scalarization in alternative theories of gravity
… investigates the spontaneous scalarization of black holes in extended gravity models. We study two scenarios in which a scalar field develops non-trivial configurations (“hair”) around charged black holes. In the first scenario, a charged black hole is subject to both a tachyonic …
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Analytic Modelling of Gravitational-Wave Source in General Relativity and Alternative Theories of Gravity
The first direct detection of gravitational waves (GWs) by LIGO in 2015 opened up new avenues for probing and better understanding the strong-field dynamics of gravity. The continuous improvement in the sensitivity of LIGO, Virgo and now KAGRA along with the forthcoming next-generation detectors …
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Black Holes, Galaxy Clusters and Gravitational Waves
This thesis deals with three aspects of modern astrophysical research. We propose a Bayesian data analysis framework to test alternative theories of gravity using observations of Gravitational Waves (GWs) from the inspiral phase of binary systems. We compare General Relativity predictions to the …
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Effective Field Theories in Cosmology
<p>During the last 20 years, a large amount of detailed cosmological observations have promoted cosmology to the rank of high-precision science. Remarkably, all the observations currently available can be accounted for by assuming that (<em>i</em>) the universe is approximately homogeneous and …
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Heterotic Braneworld Gravity
… on a brane in a higher-dimensional bulk and gravity is modified. The heterotic braneworld scenario of Lukas, Ovrut, Stelle and Waldram (LOSW) is derived from Horava-Witten M-theory, where six of the eleven dimensions have been compactified on a Calabi-Yau manifold. The solution consists of …
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Probing the cosmological dynamics of a logarithmic f (R) theory of gravity
In this thesis we make a contribution in the area of Extended Theories of Gravity (ETG) by studying the dynamics of the R ln R model. We draw attention to the importance of introducing complete alternative theories of gravity and studying the possible geometrical origin of Dark Energy (unknown form …
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Causality and the initial value problem in Modified Gravity
Lovelock and Horndeski theories are natural generalisations of Einstein’s theory of General Relativity. They find applications in Astrophysics, Cosmology and String Theory. This dissertation discusses some issues regarding the mathematical consistency of these theories. In the first part of the …