DISCRETE 2014: Fourth Symposium on Prospects in the Physics of Discrete Symmetries

Session

Parallel 14: Discrete Symmetries in Strings and in GUT theories

3 Dec 2014, 16:35

Great Hall and several lecture theatres (King's College London, Strand Campus)

113. The origin of discrete symmetries in F-theory models and their role in particle physics

Prof. George Leontaris (Ioannina University)

03/12/2014, 16:35

We discuss the origin of discrete symmetries in F-theory models. Motivated by the neutrino sector, we focus on non-abelian discrete family symmetries associated to monodromies. We combine them with SU(5) GUT and examine their low energy implications.

70. Discrete Symmetries in F-theory Model Building

Andrew Meadowcroft (University of Southampton)

03/12/2014, 17:10

F-theory is known to admit a number of discrete symmetries, such as $A_4$, $D_4$ and $Z_N$ symmetries. An introduction to the methods involved will be provided, with a view to discussing current work in the field.

23. Discrete symmetries in the heterotic-string landscape

Panos Athanasopoulos

03/12/2014, 17:40

We describe a new type of discrete symmetry that relates heterotic-string models. It is based on the spectral flow operator which is normally acting within a general $\cal N=(2,2)$ model. We use this operator to construct a map between $\cal N=(2,0)$ models. The landscape of $\cal N=(2,0)$ models is of particular interest among all heterotic-string models for two important reasons: 1....

72. Mass insertion parameters from an SU(5)xS4xU(1) family summetry model.

Maria Dimou (Southampton University)

03/12/2014, 18:15

The aim of this work is to provide an explanation for the masses and mixings of the Standard Model fermionic content as well as for its supersymmetric extensions, using an S4xU(1) family symmetry in an SU(5) background. The results are given in terms of mass insertion parameters and are compared to the latest experimental limits.

51. Anomaly-free chiral fermion sets and gauge coupling unification

Catarina Simões (IFPA, University of Liège)

03/12/2014, 18:45

We look for minimal chiral sets of fermions beyond the Standard Model that are anomaly-free and, simultaneously, vector-like particles with respect to color SU(3) and electromagnetic U(1). We then study whether the addition of such particles to the Standard Model particle content allows for the unification of gauge couplings at a high energy scale, above 5.0x10^15 GeV so as to be safely...

180. SO(10) Grand Unification from M-theory on a G2-manifold

Miguel Crispim Romao (University of Southampton)

03/12/2014, 19:15

Supersymmetry/Supergravity/Strings and Branes

We consider Grand Unified Theories based on $SO(10)$ which originate from $M$-theory on $G_2$-manifolds. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem involving an extra ${\bf 16}_X,{\bf {\overline{16}}}_X$ vector-like pair by considering discrete symmetries of the extra dimensions and preserving unification. Since Wilson line breaking...