## strings@ar

XXXIV Encuentro de la red strings@ar.

Viernes 5 de diciembre de 2008, IAFE

Lunes 22 de diciembre de 2008, DF-UNLP

PROGRAMA

XXXIV Encuentro de la red strings@ar - Programa (póster para imprimir)

Sesión I Viernes 5 de diciembre de 2008

IAFE, Ciudad Universitaria, Buenos Aires11h20 - 11h30 Apertura 11h30 - 12h30 Domenec Espriú (Universitat de Barcelona)

On parity breaking in QCD in extreme conditions12h30 - 14h00 Almuerzo 14h00 - 15h00 Diego Marqués (Universidad Nacional de La Plata)

Beyond minimal gauge mediation15h00 - 15h30 Café 15h30 - 16h30 Mirjam Cvetic (University of Pennsylvania)

D-brane instanton effects

Sesión II Lunes 22 de diciembre de 2008

Departamento de Física, UNLP, La Plata13h50 - 14h00 Reapertura 14h00 - 15h00 Pablo Minces (IAFE, Buenos Aires)

Aspects of the asymptotic limit of scalar field theory in anti-de Sitter space15h00 - 15h30 Café 15h30 - 16h30 Mariana Graña (CEA/Saclay, Paris)

E_{7}-formulation ofN=2 backgrounds16h30 - 17h00 Café 17h00 - 18h00 Martin Schvellinger (Universidad Nacional de La Plata)

String theory backgrounds and non-relativistic quantum mechanical theories

Domenec Espriú (Universitat de Barcelona)

On parity breaking in QCD in extreme conditions

We show how the introduction of a finite baryon density may trigger spontaneous parity violation in the hadronic phase of QCD. Since this involves strong interaction physics in an intermediate energy range we approximate QCD by a sigma model that retains the two lowest scalar and pseudoscalar multiplets. We propose a novel mechanism based on interplay between lightest and heavy meson states which cannot be realized solely in the Goldstone boson (pion) sector and thereby is unrelated to the one advocated by Migdal some time ago. Our approach is relevant for dense matter in an intermediate regime of few nuclear densities where quark percolation does not yet play a significant role.

Diego Marqués (Universidad Nacional de La Plata)

Beyond minimal gauge mediation

Gauge interactions represent a predictive and calculable way to communicate SUSY breaking to the MSSM. I will review the minimal framework of Gauge Mediated Supersymmetry Breaking, and comment on recent results in this topic.

Pablo Minces (IAFE, Buenos Aires)

Aspects of the asymptotic limit of scalar field theory in anti-de Sitter space

We consider a massive scalar field theory in Euclidean, (d+1)-dimensional anti-de Sitter space. We construct the Noether charges corresponding to isometries of the AdS space, and write them in terms of the field and its canonically conjugate momentum for surfaces of fixed values of the radial coordinate. We carefully map the charges to the boundary and compute their Poisson brackets within themselves and also with the asymptotic expressions of the scalar field and its conjugate momentum. We find that the global conformal algebra is reproduced, and that the asymptotic expressions of the scalar field and its conjugate momentum transform as conformal fields with scaling dimensions which depend on the mass of the bulk field and the AdS radius. We then focus on the d=2 case, where we express the boundary in terms of complex coordinates. We expand the charges in Laurent series and show that the global conformal algebra is enhanced to two copies of a local one, namely the Virasoro algebra. The Virasoro generatos are written in terms of the asymptotic expressions of the scalar field and the conjugate momentum. The Virasoro algebra is classical with no central charge. We then identify the Virasoro coefficients with those of the dual CFT living at the boundary, and introduce a radial quantization, after performing proper expansions in modes for the field and its conjugate. We show that the Virasoro coefficients satisfy the expected hermiticity properties. We introduce a normal order and compute the central charge, which to the best of our knowledge is new and depends on the mass of the scalar field and the AdS radius. We discuss applications in the AdS/CFT context.

Mariana Graña (CEA/Saclay, Paris)

E_{7}-formulation ofN=2 backgrounds

We reformulate N=2 supergravity backgrounds arising in type II string theory in terms of manifestly U-duality covariant quantities. In particular we incorporate the Ramond-Ramond scalar degrees of freedom into the previously known (generalized complex) geometry of O(6,6) pure spinors which governs the Neveu-Schwarz sector. We give E_{7}-invariant expressions for the Kahler and hyperkahler potentials describing the moduli space of vector and hypermultiplets, and also find E_{7}-covariant expressions for the Killing prepotentials defining the scalar potential as well as for the equations governing N=1 vacua.