Hidden sector through dark higgs: A nonminimal extension

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, Türkiye

Tezin Onay Tarihi: 2018

Öğrenci: KIVANÇ YİĞİT ÇINGILOĞLU

Danışman: İSMAİL TURAN

Özet:

In this thesis, a non-minimal extension of the SM with an additional non-abelian SU(2) symmetry is studied. Hidden sector opens innumerable portals for apprehension of theories beyond the SM, hence there is a wide set of gauge extensions with their own symmetries, providing viable DM candidates. Higgs mechanism and Higgs particle play a crucial role to understand how DM weakly interacts with the SM particles. There may exist unrevealed intensity frontiers in Higgs’ decay modes, and the DM can show up through those interaction channels. Although DM has not been observed so far, there are strong evidences and indirect observations for its existence. Imposing these observational constraints on the results of non-minimal ex- tensive model, a consistent region for parameter space of the DM candidates can be expressed via methods of statistical physics. One of the first DM abundance studies has been written by Lee and Weinberg in 1977 by considering evolution of DM after it decouples from the cosmic heat reservoir. But in original work, only annihilation channels of the DM are considered. However the model can be extended to include coannihilation channels as well, provided that the associated Feynman diagrams are given including dark sector particles. In this study, such extensions will be explored.