Browsing Fizik by Author "Kaya, Ali."

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  • Aspects of string thermodynamics 
    Arslanargın, Ayşe. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, we study thermodynamics of closed strings and open strings on D-branes in the microcanonical ensemble. Both single string and multi-string density of states are obtained from energy spectrum. In the ...
  • Cosmological perturbations in string gas cosmology 
    Özsoy, Ogan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    The current model of the early universe is mainly based on the in ationary scenario. Despite its phenomenological success in providing a solid mechanism for the generation of cosmological uctuations in the early universe, ...
  • Intersections of s-branes with waves and monopoles 
    Beşken, Mert. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    In this thesis we study static and time dependent solutions of supergravity theories. We discuss p-branes, plane waves, Kaluza-Klein monopoles and time dependent S-brane solutions. We then proceed to describe the Kaluza-Klein ...
  • On local inflation and cosmolagical perturbations 
    Ertan, Erol. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    It is known that a scale free spectrum of the density perturbations gives appropriate initial conditions for the structure formation in the universe. In this thesis, we determine the power spectrum of the density perturbations ...
  • 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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