Minimal grand unified theory
Start date: 29 Oct 2007,
End date: 28 Oct 2009
The current paradigm of elementary particle physics, i.e., the so-called Standard Model (SM), has held up superbly under the extensive experimental scrutiny. However, there are reasons to believe that a Grand Unified Theory (GUT) represents more accurate description of electro-weak and strong interactions and elementary particles that participate in them. GUT does not only address some of the conceptual problems of the SM such as anomaly cancellation but it offers possibility to explain various parameters of the SM such as the masses and mixings of elementary particles. And, it can incorporate mechanisms that explain the observed baryonic asymmetry of the universe and the nature of dark matter. Besides a few exceptions, realistic GUT models require a large number of assumptions to be predictive. And, these assumptions often enough outnumber predictions/postdictions.Prime example of the theory that invokes no additional assumptions and that is promising in terms of its testability is the "minimal unified SO(10 )" theory (MUST). This theory is super-symmetric and renormalizable with only the 10, 126, anti-126 and 210 representations in the Higgs sector. Due to its appeal and relative simplicity it has been focus of study of various groups. These groups addressed two separate issues. Namely, some of them addressed numerical fitting of fermion masses and mixings while other groups concentrated purely on studies of the viability of Higgs sector and corresponding symmetry breaking patterns. However, there exists no complete self-consistent study that addresses both issues simultaneously. Since there appears to be the tension between the two the proof of model's viability demands unified approach. Thus, the main objective of the project is to achieve first ever-self consistent analysis of this theory in order to conclusively establish whether it is realistic or not.
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