Master's Thesis by Kerim Demirel
In this thesis, we investigate new models of inflation induced by fluids different to standard ma... more In this thesis, we investigate new models of inflation induced by fluids different to standard matter and radiation at the cosmological level. Starting from its historical background, we introduce inflation with the scalar field description. We study trace-anomaly driven inflation and its extended version in F(R) gravity as the most promising inflationary scenario. We compare the results with recent observational data taken by the PLANCK satellite. Further, the fluid description of inflation is introduced and we provide an approach to derive observational parameters from a given equation of state (EoS) for a fluid. Two special types of fluids are investigated in which the EoS has an exponential and power series forms, respectively. We try to fit the parameters in order to produce viable inflation and compare the results with observations. Viscous fluid models are also mentioned, and we show how trace-anomaly driven inflation can be expressed in the fluid description.
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Bachelor Projects by Kerim Demirel
-, 2015
In this work we studied the phenomenon of eddy current braking. The problem can be summarized as ... more In this work we studied the phenomenon of eddy current braking. The problem can be summarized as the following: When a magnet falls through a metal pipe, such as copper or aluminum tube, it creates eddy current on the walls. This current creates an opposite magnetic field, so it induces a braking force against the motion of the magnet. Therefore, the magnet reaches a terminal velocity at which the magnetic force equals the gravitational force. We discussed some basic approaches for the analytical solution to this problem and the simulation results performed in COMSOL 5.0 environment.
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This paper is a bachelor project for PHYS400: Special Problems in Physics course at Middle East T... more This paper is a bachelor project for PHYS400: Special Problems in Physics course at Middle East Technical University. In this paper, the historical background of black body (BB) radiation was reviewed, and famous formulae for BB Radiation such as Kirchhoff Law, Wien's Approximation, Rayleigh-Jeans Law, Planck's Law were derived mathematically. Then, as an example of BB Radiation, cosmic microwave background (CMB) was introduced and investigated.
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In this paper, the language of standard big bang cosmology, the problems of the big bang, and as ... more In this paper, the language of standard big bang cosmology, the problems of the big bang, and as a solution to these problems, the inflationary cosmology are introduced. This paper is a bachelor project for ASTR312: Modern Astrophysics II course at Middle East Technical University.
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Talks by Kerim Demirel
In this presentation I tried to present a paper titled " Combined Analysis of the Integrated Sach... more In this presentation I tried to present a paper titled " Combined Analysis of the Integrated Sachs-Wolfe Effect and Cosmological Implications "; written by Tommaso Giannantonio and his colleagues based on a study in 2008. Its main aim is to investigate ISW effect in CMB anisotropies by looking at the correlations between CMB map and galaxy catalogues and to make possible implications on cosmology.
This talk was given in a graduate cosmology course at Universitat Autonoma de Barcelona. The paper contains both slides and speech text from my part of the presentation.
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In this presentation, starting with a recall from the early universe, we introduced the concept o... more In this presentation, starting with a recall from the early universe, we introduced the concept of baryon acoustic oscillations (BAO). Then, we presented our results of a course project about finding BAO in MICECAT simulation via statistical methods and programming. At the end, cosmological implications of BAO were discussed.
This talk was given as a course project in a graduate cosmology course at Universitat Autonoma de Barcelona.
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Papers by Kerim Demirel
In this thesis, we investigate new models of inflation induced by fluids different to standard ma... more In this thesis, we investigate new models of inflation induced by fluids different to standard matter and radiation at the cosmological level. Starting from its historical background, we introduce inflation with the scalar field description. We study trace-anomaly driven inflation and its extended version in F(R) gravity as the most promising inflationary scenario. We compare the results with recent observational data taken by the PLANCK satellite. Further, the fluid description of inflation is introduced and we provide an approach to derive observational parameters from a given equation of state (EoS) for a fluid. Two special types of fluids are investigated in which the EoS has an exponential and power series forms, respectively. We try to fit the parameters in order to produce viable inflation and compare the results with observations. Viscous fluid models are also mentioned, and we show how trace-anomaly driven inflation can be expressed in the fluid description.
Bookmarks Related papers MentionsView impact
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Master's Thesis by Kerim Demirel
Bachelor Projects by Kerim Demirel
Talks by Kerim Demirel
This talk was given in a graduate cosmology course at Universitat Autonoma de Barcelona. The paper contains both slides and speech text from my part of the presentation.
This talk was given as a course project in a graduate cosmology course at Universitat Autonoma de Barcelona.
Papers by Kerim Demirel
This talk was given in a graduate cosmology course at Universitat Autonoma de Barcelona. The paper contains both slides and speech text from my part of the presentation.
This talk was given as a course project in a graduate cosmology course at Universitat Autonoma de Barcelona.