Browsing by Subject "Cosmology"
Now showing items 1-5 of 5
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Astrophysical tests of modified gravity
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2014-10-07)Einstein's theory of general relativity has been the accepted theory of gravity for nearly a century but how well have we really tested it? The laws of gravity have been probed in our solar system to extremely high precision ...
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Classical and quantum solutions in Brans-Dicke cosmology with a perfect fluid
(American Physical SocietyPhysical Review D, 2016)We consider the application of group invariant transformations in order to constrain a flat isotropic and homogeneous cosmological model, containing of a Brans-Dicke scalar field and a perfect fluid with a constant equation ...
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Dynamical analysis in scalar field cosmology
(APSPhysical Review D, 2015-06-23)We give a general method to find exact cosmological solutions for scalar-field dark energy in the presence of perfect fluids. We use the existence of invariant transformations for the Wheeler De Witt (WdW) equation. We ...
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Hyperbolic Inflation in the Light of Planck 2015 data
(APSPhysical Review D, 2015-05-18)Rubano and Barrow have discussed the emergence of a dark energy, with late-time cosmic acceleration arising from a self-interacting homogeneous scalar field with a potential of hyperbolic power type. Here, we study the ...
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The instanton liquid and the axion
(University of CambridgeDepartment of Applied Mathematics and Theoretical Physics, 2010-05-04)The ultimate goal of this thesis is to improve our understanding of the cosmology of axions. Axions couple to QCD instantons and these non-perturbative effects are modeled within the framework of the interacting instanton ...