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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 13 of 13 for “"Scalar-Tensor Theories"”.
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Neutron Star Models in Alternative Theories of Gravity
… 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 polytropic model and more …
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Gravitational Waves and Inspiraling Compact Binaries in Alternative Theories of Gravity
… 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 Parametrized Post-Newtonian: PPN) …
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Source modelling at the dawn of gravitational-wave astronomy
… formation of compact objects in the framework of scalar-tensor theories of gravity. All these phenomena are deeply characterized by a continuous interplay between General Relativity and astrophysics: despite being a truly relativistic messenger, gravitational waves encode details of the …
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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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Dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang nucleosynthesis
… problems are probed in the framework of scalar-tensor theories of gravity. An extended inflationary cosmological model has been proposed.
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Testing General Relativity with the next generation of cosmological surveys
… In this analysis, we investigate the Horndeski scalar-tensor theories and beyond which has been recently described in the generilized dark energy (DE) or scalar-tensor paradigm - dubbed unified dark energy (UDE). This applies the 3+1 Arnowitt-DeserMisner (ADM) formalism where a general action in …
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Compact Objects In Relativistic Theories Of Gravity
… neutron stars and black holes, in relativistic theories of gravity. We start by studying the role of nuclear physics (encoded in the so-called equation of state) in determining the properties of neutron stars in general relativity. We show that low-mass neutron stars are potentially useful …
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Motion in a scalar field
Light scalar fields emerge as a generic prediction in physics beyond the Standard Model. For example, they arise as new degrees of freedom in modified gravity, as Kaluza-Klein modes from extra compactified dimensions, and as Nambu-Goldstone bosons from spontaneously broken symmetries. Far from …
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Analytic Modelling of Gravitational-Wave Source in General Relativity and Alternative Theories of Gravity
… of compact objects. Alternative gravitational theories generally predict dynamics different from GR, therefore, it is also expected that the observations of GWs will shed more light on these theories by constraining their parameters. In addition to the applications in usual parameter estimation …
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Effective Field Theories in Cosmology
… have been extensively used to study alternative theories of gravity which mimic a non-vanishing cosmological constant and to build models of the early universe which generate the observed anisotropies and inhomogeneities through a period of accelerated cosmic expansion. In this thesis, we study …
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Galaxy-Scale Signatures of Screened Modified Gravities
In recent years, theories of gravity incorporating a scalar field coupled to gravity---'scalar-tensor' theories---have been subject to increased attention. In these theories, the scalar field mediates gravitational-strength 'fifth forces'. For such scalar fields to retain cosmological relevance …
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Astrophysical tests of modified gravity
… has prompted a theoretical study of modified theories of gravity that can self-accelerate on large scales. Indeed, the next decade will be an exciting era where several satellites will probe the structure of gravity on cosmological scales and put these theoretical predictions to the test. …