Found 3 result(s)

11.11.2014 (Tuesday)

String Compactifications, Dark Radiation and a 0.1-1 keV Cosmic Axion Background

Regular Seminar Joseph Conlon (Oxford U., Theor. Phys.)

at:
13:30 IC
room H503
abstract:

29.02.2012 (Wednesday)

Brane/Antibrane Backreaction in Axion Monodromy Inflation

Regular Seminar Joseph Conlon (Oxford)

at:
13:15 KCL
room S4.23
abstract:

TransPlanckian inflationary excursions are very interesting because they are sensitive to Planck-suppressed operators and can generate observable tensor modes. I review one proposed model generating a transPlanckian excursion and argue that consideration of antibrane backreaction renders the assumptions entering the model inconsistent.

12.11.2009 (Thursday)

Gauge threshold corrections for local string models

Regular Seminar Joseph Conlon (Oxford)

at:
13:45 QMW
room 410A
abstract:

Local string models are those where Standard Model degrees of freedom arise on a small region inside a large bulk volume. I study threshold effects on gauge coupling running for such models. The Kaplunovsky-Louis formula for locally supersymmetric gauge theories predicts the unification scale should be the bulk winding mode scale, parametrically large than the string scale where divergences are naively cut off. Analysis of explicit string models on orbifold/orientifold geometries confirms this. The winding mode scale arises from the presence of tadpoles uncancelled in the local model. I briefly discuss phenomenological applications to supersymmetry breaking and gauge coupling unification.