Browsing M.S. Theses by Subject "Cosmology."

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  • Dark energy problem and possible solutions 
    Çamlıbel, Ali Kazım. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The end of the twentieth century is marked by a revolutionary discovery in cosmology: The expansion of the universe is accelerating, as revealed by measurements of type Ia supernovae at z 1. This most likely means that ...
  • Gravitational wave solutions to linearized Jordan Brans Dicke theory on a cosmological background 
    Dünya, Önder. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    In this thesis, approximate vacuum solutions of Jordan-Brans-Dicke theory for perturbed scalar eld and perturbed Robertson-Walker metric, were found. First we obtained solutions for the scale factor a(t) and the scalar ...
  • Kinetic theory in k=0 Friedmann-Robertson-Walker cosmology 
    Tülümen, Nimet. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    In the thesis we calculated Boltzmann Equation in RW metric. After that in the at space-like slices we showed that for RW metric it is not possible to nd any equilibrium solutions. However we looked for the equilibrium ...
  • On cosmological supernova observations and alternative gravity theories 
    Feyzioğlu, Mehmet Akif. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    This thesis is about getting the most information from the cosmological super nova data about the expansion history of the homogeneous and isotropic universe, with the least possible set of assumptions. To this end, we fit ...
  • On the cosmological impact of a quantized scalar field 
    Algan, Merve Tarman. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2016.)
    We explicitly compute the leading order contribution to the stress-energy- momentum tensor of a scalar eld, which propagates in a Friedmann-Robertson-Walker (FRW) universe and placed in the in nite adiabatic vacuum. Since ...

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