M.Phil / MS
Permanent URI for this collectionhttps://repository.cuilahore.edu.pk/handle/123456789/52
This collection archives the complete set of theses produced by students of the COMSATS University Islamabad, Lahore Campus.
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Item Generalized Chaplygin Gas Traversable Wormhole Solutions by Using GUP Corrected Casimir Energy(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2020) Ubaid Ur Rehman; SP19-RMT-019; LHR TP 6477; Dr. Abdul JawadIn this thesis, we explore the wormhole solutions (which are initially pro- sed by Garattoni (Eur. Phys. J. C 79(2019)951) who take generalized certainty principle (GUP) with Casimir energy) in the framework of two ll-known dark energy models, generalized Chaplygin gas and polytropic s. We consider the GUP corrected pressure (force per unit surface area) the equation of state of these dark energy models to construct the gener- zed Chaplygin gas corrected energy density and polytropic gas corrected ergy density. Three models of redshift function are taken into account construct shape function as well as wormhole geometry for both cases corrected energy densities. We find the behavior of some parameters ough equation of state, energy conditions (null, weak and strong) at the oat of the wormhole with radius r0.Item Holographic Inflation in Modified Theories of Gravity(Library Information Services, COMSATS University Islamabad, Lahore Campus, 2020) Manzar Abbas; SP19-RMT-013; LHR TP 6472; Dr. Abdul JawadIn this thesis, we investigate the holographic inflation in the framework of two gravitational theories like f(T) gravity where T corresponds to the torsion scalar and DGP braneworld model which is based on the idea that our four dimensional FRW universe located on five dimensional manifold. TheGranda-Oliveros cutoff is used to explore all the inflationary parameters as slow roll parameters ( 1, 2, 3), number of e−folds N, scalar spectral index ns, tensor-to-scalar ratio r and running of the scalar spectral index αs. Also, we investigate the behavior of inflationary parameters ns−N, αs− N, r−N, αs−ns and r−ns through graphical presentation. The behavior of these parameters show the consistency with Planck data 2018.