GRAND UNIFIED THEORIES BASED ON SU(N) AS A GAUGE GROUP.

Title: GRAND UNIFIED THEORIES BASED ON SU(N) AS A GAUGE GROUP.
Identifier: AAI8302537
identifier: 8302537
Creator: POPOVIC, MILORAD BRANKO.
Contributor: Rabindra Nath Mohapatra
Date: 1982
Language: English
Publisher: City University of New York.
Subject: Physics, Elementary Particles and High Energy
Abstract: We discuss possible extensions of the minimal grand unified theory based on SU(5). We stress two basic problems of any unifing scheme: namely, the problem of generations and the possibility of having intermediate mass scales between the grand unified scale and the scale of weak interactions. We show how the principle of asymptotic freedom and the "anomaly free" condition can be used to put limits on the number of generations. In the second part of this work we study the maximal grand unification symmetry based on the SU(16) group and derive limits (using renormalization group equations) on intermediate mass scales for various possible chains of symmetry breaking. We show in particular that, in this model, the scale of grand unification can be as low as 10('5)GeV without any conflict with observations. One can also have parity restoration at low energies (of order 200 GeV) provided we allow sin('2)O(,W) = .27. Detailed phenomenological implications of the SU(16) model for baryon non-conservation are discussed.
Type: dissertation
Source: PQT Legacy CUNY.xlsx
degree: Ph.D.
Program: Physics