Theory and Phenomenology of new Theories of Fundamental Interactions

Helene Gertov

Publikation: AfhandlingPh.d.-afhandling

Abstract

In this thesis two different perturbative and elementary extensions of the Standard Model are presented. In the first model the Standard model is extended to a SU(4) SO(6) symmetry which breaks spontaneously to Sp(4) SO(5), leaving 5 Goldstone bosons. Three of them become the longitudinal components of the electroweak gauge bosons, one is an elementary pseudo Goldstone boson Higgs, and the last one is a good pseudo Goldstone boson Dark Matter candidate, since it is stable and neutral with respect to the Standard Model. When the one-loop correction is calculated using the Coleman-Weinberg potential, the SU(4) is no longer preserved, but is broken to Sp(4) by the the Yukawa, and the electroweak gauge interactions, and the Goldstone bosons acquire a nonzero mass and become pseudo Goldstone bosons. At this point the mass matrix will no longer be diagonal, but there will be a mass mixing between the field and the fourth pseudo Goldstone boson. One of the mass eigenstate of this mixing is identified with the observed Higgs Boson. The one-loop corrections from the top dominates, and the vacuum is aligned in the direction, where the observed Higgs Boson is mostly a pseudo Goldstone boson. Since the breaking pattern SU(4) ! Sp(4) is isomorphic to SO(6) ! SO(5), the other model examined is an SO(N) ! SO(N
OriginalsprogEngelsk
Bevilgende institution
  • Syddansk Universitet
Vejledere/rådgivere
  • Sannino, Francesco, Hovedvejleder
Dato for forsvar10. okt. 2018
UdgivelsesstedOdense
Udgiver
StatusUdgivet - 2018

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Afhandlingen kan læses på SDUs bibliotek. 

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