Browsing Department of Materials Science and Metallurgy by Subject "Cosmology"

Now showing items 1-5 of 5

  • Astrophysical tests of modified gravity 

    Sakstein, Jeremy Aaron (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 ...

  • Classical and quantum solutions in Brans-Dicke cosmology with a perfect fluid 

    Paliathanasis, Andronikos; Tsamparlis, Michael; Basilakos, Spyros; Barrow, John David (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 ...

  • Dynamical analysis in scalar field cosmology 

    Paliathanasis, Andronikos; Tsamparlis, Michael; Basilakos, Spyros; Barrow, John David (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 ...

  • Hyperbolic Inflation in the Light of Planck 2015 data 

    Basilakos, Spyros; Barrow, John David (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 ...

  • The instanton liquid and the axion 

    Wantz, Olivier (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 ...