strings@ar


XLI Encuentro de la red strings@ar.
Jueves 17 de junio de 2010, IAFE


PROGRAMA


Jueves 17 de junio de 2010
IAFE, Ciudad Universitaria, Buenos Aires
13h00 - 14h00   Carmen Núñez (IAFE, Buenos Aires)  
  Estabilización de módulos en compatificación de cuerdas con flujos  
14h00 - 14h30 Café
14h30 - 15h30   Leandro Da Rold (Instituto Balseiro, Bariloche)  
  Top-bottom puzzle  
15h30 - 16h00 Café
16h00 - 17h00   Martin Schvellinger (IFLP-CONICET, La Plata)  
  QCD from supergravity and strings  


Carmen Núñez (IAFE, Buenos Aires)
Estabilización de módulos en compatificación de cuerdas con flujos
Los flujos de campos antisimétricos permiten generar acoplamientos para los módulos en el superpotencial y, suplementados con otros efectos, proveen un mecanismo capaz de estabilizarlos. En esta charla voy a introducir algunos aspectos básicos de la compactificación de teorías de cuerdas con flujos, concentrándome en un ejemplo particular de orientifolio de la supercuerda tipo IIB, y presentaré resultados preliminares de la búsqueda de vacíos en estos modelos.


Leandro Da Rold (Instituto Balseiro, Bariloche)
Top-bottom puzzle
The LEP and SLD experimental measurements of the bottom-quark forward-backward asymmetry suggest deviations from the Standard Model (SM) in the $Zb\bar b$ couplings. Recently, Tevatron has observed a deviation in the forward-backward asymmetry of the top-quark pair production. Both measurements suggest that new physics, coupled more strongly with the heavy SM states, could be responsible for these deviations. We will present a composite Higgs model that can naturally explain the deviations in the bottom sector, and we will discuss its capability to improve the top asymmetry over the SM. We will show the 5D theory dual to the composite Higgs model.


Martin Schvellinger (IFLP-CONICET, La Plata)
QCD from supergravity and strings
Heavy Ion Collisions at RHIC have motivated an increasing interest in the properties of deconfined quark-gluon plasma. From the theoretical point of view this is a strongly-coupled system, where the gauge/string duality is an excellent tool to use. I will give an introduction to the role of string theory corrections to type IIB supergravity backgrounds at finite temperature which are dual to strongly-coupled supersymmetric plasmas. I will consider the U(1) R-symmetry current two-point functions, and describe them at hydrodynamic regime in the dual field theories, focussing upon the leading finite 't Hooft coupling corrections to R-charge transport coefficients. I will show general results for AdS-Schwarzschild black-hole with a compact Einstein manifold and describe an explicit example of ten-dimensional calculation of plasma conductivity, including the leading order type IIB string theory corrections.