Dissertation/Thesis Abstract

Extensions of the Standard Model with Dark Matter in Some Explicit Examples
by Niasar, Mohammadreza Zakeri, Ph.D., University of California, Riverside, 2017, 205; 10606425
Abstract (Summary)

The compelling astrophysical evidence for dark matter on one hand and the experimental evidence for neutrino masses on the other, demands modifications beyond the Standard Model. Therefore, building new models by extending the symmetries and particle content of the Standard Model is being pursued to remedy these problems. In this thesis, various models along with their predictions are presented. First, a gauge SU(2)N extension of the Standard Model, under which all of the Standard Model particles are singlet is introduced. The inverse seesaw mechanism is implemented for neutrino mass, with the new gauge boson as a dark matter candidate. The second paper is a gauge B-L extension of the Standard Model which breaks down to Z3, and it includes a long-lived dark matter candidate. The next model assumes that leptons do not couple directly to Higgs, and one loop mass generation is considered with important consequences, including Higgs decay, muon anomalous magnetic moment, etc. We then look at a U(1) gauge extension of the supersymmetric Standard Model, which has no μ term, and the Higgs boson's mass supersymmetric constraint is relaxed. The next model is a gauge B-L extension of the Standard Model with radiative seesaw neutrino mass and multipartite dark matter. We then consider another gauge U(1) extension under which quarks and leptons of each family may transform differently, while flavor-changing interactions are suitably suppressed. The next paper has an unbroken gauge SU(2) symmetry, which becomes confining at keV scale. We discuss the cosmological constraints and the implications for future e +e colliders. Finally, an alternative left-right model is proposed with an automatic residual Z 2 × Z3 symmetry, such that dark matter has two components, i.e., one Dirac fermion and one complex scalar.

Indexing (document details)
Advisor: Ma, Ernest
Commitee: Tanedo, Philip Flip, Yu, Hai-bo
School: University of California, Riverside
Department: Physics
School Location: United States -- California
Source: DAI-B 79/03(E), Dissertation Abstracts International
Source Type: DISSERTATION
Subjects: Physics, Theoretical physics
Keywords: Dark matter, Gauge extension, Neutrino, Radiative mass, Standard model, Supersymmetry
Publication Number: 10606425
ISBN: 978-0-355-47187-8
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