PLANCK 2011 - From the Planck Scale to the ElectroWeak Scale

Session

P3 – STRINGS, GRAVITY & HOLOGRAPHY

31 May 2011, 14:00

Main Auditorium (IST Congress Centre)

Conveners

P3 – STRINGS, GRAVITY & HOLOGRAPHY

• Fernando Marchesano Buznego (Unknown)

6. Reduction of N=1, E8 SYM over SU(3)/U(1)xU(1)xZ3 and its four-dimensional effective action

Prof. Nikos Irges (NTUA)

31/05/2011, 14:00

We propose an extension of the Standard Model inspired by the E_8 x E_8 Heterotic String. In order that a reasonable effective Lagrangian is presented we neglect everything else other than the ten-dimensional N=1 supersymmetric Yang-Mills sector associated with one of the gauge factors and certain couplings necessary for anomaly cancellation. We consider a compactified space-time M_4 x...

36. Sequestering by global symmetries in Calabi-Yau string models

Claudio Scrucca (Institute for Theoretical Physics, EPFL)

31/05/2011, 14:15

I will report on a study of the possibility of realizing an effective sequestering mechanism between visible and hiden sectors in generic Calabi-Yau heterotic string models, which would ensure an approximate universality of soft scalar masses as a consequence of a global symmetry. I will focus on the brane-to-brane effects that are related to effective interactions involving four matter fields...

50. How Grand Unification is realized in String Theory?

Kang Sin Choi (Korea Institute for Advanced Study)

31/05/2011, 14:30

The structure of the Standard Model strongly suggests that it is embedded into Grand Unification based on groups of E_n series. Compactification of string theory naturally realise such relation yielding the gauge group, matter spectrum and Yukawa interactions. We focus on SU(3)xSU(2)xU(1) embedding of Standard Model in F-theory and learn features contrasted to field theoretic unification.

47. Weak Mixing Angle and Proton Stability in F-theory GUT

Prof. Bumseok Kyae (Pusan National Univ.)

31/05/2011, 14:45

It is pointed out that a class of flipped SU(5) models based on F-theory naturally explains the gauge coupling unification. It is because the group SU(5) x U(1)_X is embedded in SO(10) and E_8. To prohibit the dimension 4 and 5 proton decay processes, the structure group should be SU(3) or smaller. Extra heavy vector-like pairs of {5_{-2},5*_2} except only one pair of Higgs should be also...

86. Low energy physics of a F-theory GUT model

Jacek Pawelczyk (University of Warsaw)

31/05/2011, 15:00

I shall discuss a GUT model inspired by recent local F-theory constructions. The model has extra matter which after switching vev play the role of messengers. The resulting model does not lead to unacceptable baryon/lepton number violating processes. SUSY is broke at a hidden sector. I shall discuss the resulting spectrum of the lightest SUSY particles and some phenomenological...

28. Warming up brane-antibrane inflation

Dr Joao Rosa (University of Edinburgh)

31/05/2011, 15:15

We show that, in constructions with additional intersecting D-branes, brane-antibrane inflation may naturally occur in a warm regime, such that strong dissipative effects damp the inflaton's motion, greatly alleviating the associated eta-problem. We illustrate this for D3-antiD3 inflation in flat space with additional flavor D7-branes, where for both a Coulomb-like and a quadratic potential a...