Cosmological perturbations in string gas cosmology

dc.contributor	Graduate Program in Physics.
dc.contributor.advisor	Kaya, Ali.
dc.contributor.author	Özsoy, Ogan.
dc.date.accessioned	2023-03-16T10:38:10Z
dc.date.available	2023-03-16T10:38:10Z
dc.date.issued	2011.
dc.identifier.other	PHYS 2011 O87
dc.identifier.uri	http://digitalarchive.boun.edu.tr/handle/123456789/13716
dc.description.abstract	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, this scenario su ers from several conceptual problems. Therefore, it is important to investigate the subject within a fundamental theory. Driven by this motivation, in this thesis, we study the cosmological perturbations in the string gas cosmology formalism. First, we give a review on string thermodynamics. Then we go over a recently proposed scenario of producing scale-invariant cosmological perturbations and examine its problems. Finally, we discuss an alternative model based on the open strings attached on a D-brane and nd out that it is hard to realize a scale-free spectrum for the cosmological perturbations.
dc.format.extent	30cm.
dc.publisher	Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011.
dc.subject.lcsh	Cosmology -- Mathematics.
dc.subject.lcsh	String models -- Mathematics.
dc.title	Cosmological perturbations in string gas cosmology
dc.format.pages	ix, 40 leaves ;