College of Science and Engineering Projects and Theses
Permanent URI for this collectionhttps://hdl.handle.net/10657.1/830
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Browsing College of Science and Engineering Projects and Theses by Subject "astrophysics"
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Item Particle Interactions in Compact Objects and The Early Universe(2021-12-03) Khan, Faiz Ahmad; Masood, Samina; Garrison, David; Reddell, BrandonWe show there is an effect of an extremely large magnetic field in highly dense media that has not been explored in prior work. We discuss the renormalizability of QED in such a medium. These extreme situations are found in the exotic environment of compact objects, especially neutron stars. It is found that the renormalization constants of QED are significantly modified in stellar media due to an additional B dependent term that appears due to the very high magnetic field in a star. The newly computed renormalization constants can be used as effective parameters of QED to study the particle processes in hot and dense stars with a strong magnetic field. We propose to use modified parameters to analyze astrophysical data and investigate the structure and composition of stars.Item The magnetic moment of leptons at high temperatures(2019-05-14) Mein, Holly Christine; Masood, Samina; Garrison, David; Mayes, Van EricThe magnetic moment is a measure of the interaction of charged particles with the magnetic field. It depends on the mass of the particles. All charged particles have an intrinsic magnetic moment due to their intrinsic spin, whereas the neutral particles do not exhibit intrinsic magnetic moment. Charged particles can induce a magnetic moment to neutral particles. This induced magnetic moment of neutral particles is a perturbative effective and is produced radiatively at higher orders of perturbation. There is still information not known about the structure and magnetic moment of particles. The magnetic moment of particles is not precisely calculated for cases when the effective mass of particles is modified due to radiative corrections at high energies. Therefore, the magnetic moment of particles needs to be calculated for individual particles that interact differently. This thesis is comprised of an overview of the magnetic moment of all flavors of leptons in vacuum (at T=0) as well as in a medium. Due to the interaction with the medium, the effect of high temperatures of the medium contribute to the magnetic moment. Some of the cosmological applications of temperature dependent magnetic moment are also discussed.