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PRODID:-//Seminarios de Física Teorica - ECPv3.12.3//NONSGML v1.0//EN
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X-WR-CALNAME:Seminarios de Física Teorica
X-ORIGINAL-URL:http://jacobi.fis.ucm.es/wordpress
X-WR-CALDESC:Events for Seminarios de Física Teorica
BEGIN:VEVENT
DTSTART:20170921T200000Z
DTEND:20170922T093000Z
DTSTAMP:20170924T101451Z
CREATED:20170911T124324Z
LAST-MODIFIED:20170911T124324Z
UID:117-1506024000-1506072600@jacobi.fis.ucm.es
SUMMARY:Dra. María Gómez Rocha
DESCRIPTION:Lugar: Seminario de Física Teórica I\, 3ª planta Oeste\nDía: Viernes 22 de Septiembre (atención al día inusual)\nHora: 12h\n\nTítulo: Effective-particle approach to bound states of quarks and gluons in heavy-flavor QCD\n\nResumen:\nIn response to the growing need for theoretical tools that can be used in QCD to describe and understand the dynamics of gluons in hadrons in the Minkowski space-time\, the renormalization group procedure for effective particles (RGPEP) is shown in the simplest available context of heavy quarkonia to exhibit a welcome degree of universality in its first approximation\, once one assumes that beyond perturbation theory gluons obtain effective mass. Namely\, in the second-order terms\, the Coulomb potential with Breit-Fermi spin couplings in the effective quark-antiquark component of a heavy quarkonium\, is corrected in one-flavor QCD by a spin-independent harmonic oscillator term that does not depend on the assumed effective gluon mass or the choice of the RGPEP generator.
URL:http://jacobi.fis.ucm.es/wordpress/seminario/dra-maria-gomez-rocha/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28011\, España
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BEGIN:VEVENT
DTSTART:20170928T110000Z
DTEND:20170928T120000Z
DTSTAMP:20170924T101451Z
CREATED:20170922T105421Z
LAST-MODIFIED:20170922T105421Z
UID:119-1506596400-1506600000@jacobi.fis.ucm.es
SUMMARY:Marco Baiti Jesy
DESCRIPTION:\nLugar: Seminario de Física Teórica I\, 3ª planta Oeste\nDía: Jueves 28 de septiembre\nHora: 15:00h\n\nTítulo: ACTIVATED DYNAMICS IN GLASSES\n\nResumen:\n\nIf a liquid is cooled fast enough\, it is possible to avoid the phase transition towards a crystalline solid\, and the system enters a metastable state\, called supercooled liquid. If the cooling continues\, the viscosity and the relaxation times grow so steeply that the system becomes effectively solid\, even though the system did not undergo any thermodynamic phase transition. Such a solid is called a glass.\nGlassy materials appear in both in everyday life and in high-tech devices. Further\, many systems in biology\, computer science and mathematics also exhibit a glassy behavior.\nIn this talk\, we try to understand the mechanisms underlying the rigidity of glasses. In phase space\, the dynamics of such systems can be regarded as a random walk in a high-dimensional energy landscape. This landscape is rugged\, so in order to sample new configurations the system must 'hop' over an energy barrier from one local minimum (basin) to another. This type of process is called activation.\nWe adopt a bottom-up strategy to understand this phenomenon. We start from the simplest models\, attempt to fully characterize the behavior of their random walk in phase space\, and only then add features representing more realistic glasses. We analyze three paradigmatic mean-field models: the Trap Model\, the Random Energy Model (REM) and the p-spin model.\nIn particular\, in the REM\, we see that despite the motion in configuration space is complex on intermediate time-scales\, there is a very large separation of time scales that washes out correlations induced by the exploration of the landscape. As a result\, by coarse-graining the dynamical evolution in terms of basins of the energy landscape\, the dynamics can be effectively described through a hopping between disconnected traps. This type of description is not applicable anymore in systems with a higher degree of correlation in the energy landscape\, such as the p-spin model\, where the energy landscape exhibits large basins which are connected one to the other through non-trivial boundaries.\n\n\n\n\n\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/marco-baiti-jesy/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28011\, España
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