Past Seminars

(beginning Sept. 97)         



Seminarios de Física Teórica 
Theoretical Physics Seminar 
Fisika Teorikoa: Hitzaldiak
         



Probing the Dynamics of Symmetry Breaking in Condensed Matter Systems
A.J. Gill

Université de Genève

Date: 1st September 1997
Key Words : Superfluid, Symmetry-breaking, Defect formation

Abstract:
In the mid 1980s there were two incompatible estimates of the initial defect density after a symmetry breaking phase transition, the Zurek scenario and an estimate usually attributed to Kibble. Recent experiments in superfluids exclude one possibility but are compatible with the other. Current work aims to use topological defects and their formation in certain condensed matter systems as an experimental handle on the dynamics of symmetry-breaking phase transitions. 


Baryon Density in the Central Region of a Heavy-Ion Collision :
Plagiarise Everybody and Publish Everywhere

A.J. Gill

Université de Genève

Date: 3dSeptember 1997
Key Words : Symmetry-breaking, Sigma Model, Topological Defects, Chiral Transition, QCD

Abstract:
The O(4) linear sigma model of the chiral transition in QCD is similar to models of the superfluid transition in 4He and 3He. Observations of vortex formation in superfluid helium have recently improved the understanding of the dynamics of such transitions. This is exploited to estimate the baryon density in the central region of a heavy ion region and the result is consistent with the long held belief that this density is very small in comparison with the pion density.


Una revisión de la ecuación de Lorentz-Dirac

Rafael Blanco Alcañiz

Universidad de Cantabria

Día: 30 de Septiembre 1997

New approach to integrability in any dimension

Joaquín Sánchez Guillén

Universidade de Santiago

Date: October 22, 1997


Effective field theory approach to
spin wave mediated non-reciprocal effects in antiferromagnetic crystals.

José María Román

Universidad de Barcelona

Date: November 13, 1997

Modelos lineal y cuadrático del proceso de recalentamiento

Luis Chimento

Universidad de Buenos Aires

Fecha: 16 de Diciembre de 1997

Propiedades térmicas de la espuma espacio-temporal

Luis J. Garay

IMAFF - CSIC (Madrid)

Fecha: 18 de Diciembre de 1997

Abstract:
An effective model for the spacetime foam is constructed in terms of nonlocal interactions in a classical background. Then, in the weak-coupling approximation, the evolution of the low-energy density matrix is determined by a master equation that predicts a loss of quantum coherence. It is further proposed that spacetime foam can be described by a quantum thermal field that, apart from inducing a diffusion process, gives rise to effects such as gravitational Lamb and Stark shifts as well as a quantum damping in the evolution of the low-energy observables. 


Fases inconmensurables: estática y dinámica

J. Manuel Pérez Mato

Dpto. Física de la Materia Condensada, UPV-EHU

Fecha: 28 de Enero de 1998

Running Sandpiles

Fernando Ruiz Ruiz

Universidad Complutense de Madrid

Fecha: 4 de Febrero de 1998

La electrodinámica no lineal de Born-Infeld, ayer y hoy

Roberto Emparan García de Salazar

Durham Univ.

Fecha: 9 de Febrero de 1998

Kinematic Self-Similarity

Alan Coley

Dalhousie University

Fecha: 2 de Marzo de 1998

Dinámica en el horizonte de un agujero negro y la entropía de Bekenstein-Hawking.

Max Bañados

Centro de Estudios Científicos de Santiago (Chile) y Departamento de Física Teórica, Universidad de Zaragoza

Fecha: 6 de Marzo de 1998

Astrofísica en tiempos de relajación

Luis Herrera

Universidad de Salamanca

Fecha:  7 de Abril de 1998

Piones en un baño térmico

José María Martínez Resco

Dpto. de Física Teórica e Historia de la Ciencia, UPV-EHU

Fecha:  22 de Abril de 1998

Visions of the End of Inflation

Bruce Bassett

SISSA, Trieste

Fecha:  19 de Junio de 1998



Seminarios de Otoño sobre  Cosmología / Udazkenean: Kosmologia




      

           El incierto destino del par brana-antibrana
 

           Stochastic effects in cosmology
 

           Cosmología-M
 

           El fondo de rayos X como sonda cosmológica
 

           Kinks espacio-temporales
 

 




 

For more information, contact I.L. Egusquiza


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Last update: Sept 7, 1998