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El límit per poder anunciar en paper seminaris i conferències en els ascensors és el divendres a les 12 hores de la setmana anterior. Amb posterioritat a aquesta data el seminari o conferència quedarà només recollit al web de la Facultat. Aleshores la publicitació en paper serà responsabilitat dels organitzadors.



Facultat de Física, Dimecres 01 de Juny de 2016, a les 11:30h

Confèrencia del Dep. de Física Aplicada

Títol: Codificación del frente de onda como técnica para mejorar las prestaciones de los sistemas ópticos
Conferenciant: Dr. Justo Arines Piferrer (Universidade de Santiago de Compostela)
Abstract:

En esta charla abordaremos la problemática de obtener imágenes de alta resolución, introduciendo las técnicas de óptica adaptativa y deconvolución, y profundizando en la técnica de codificación de frente de onda, presentando sus aplicaciones iniciales y proponiendo su uso para el diseño de soluciones a los distintos errores refractivos oculares.

Lloc: Sala de Graus Eduard Fontseré
Contacte: sbosch@ub.edu
Web:

Facultat de Física, Dimecres 01 de Juny de 2016, a les 11:45h

Seminari del Dep. de Física Quàntica i Astrofísica

Títol: Superfluid Helium droplets as a very cold nanolaboratory
Conferenciant: Manuel Barranco (FQA and IRSAMC - Université Paul Sabatier, Toulouse)
Abstract:

In this talk I will review at an introductory level how Helium droplets have been used to address atomic and molecular spectroscopy and to probe superfluidity at the nanoscale.

Lloc: Aula 507, Pere Pascual
Contacte: bruno@ecm.ub.edu
Web: http://www.ecm.ub.es/~bruno/semweb/fansem.html

Facultat de Física, Dijous 02 de Juny de 2016, a les 14:00h

Seminari del Dep. de Física Quàntica i Astrofísica

Títol: Beyond adiabatic approx. in Big Bang Cosmology: hydrodynamics, resurgence and entropy prod. in the Universe
Conferenciant: Alex Buchel (Perimeter Institute)
Abstract:

We use holography for the ab-initio determination of the non-equilibrium behavior of matter in a Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe. We focus on matter without scale invariance and develop an expansion for the corresponding entropy production in terms of the derivatives of the cosmological scale factor. We show that the resulting series is asymptotic and we discuss its resurgent properties. Finally, we compute the resummed entropy production rate in de Sitter Universe at late times and show that the leading order approximation given by bulk viscosity effects can strongly overestimate/underestimate the rate depending on the microscopic parameters.

Lloc: Aula 507
Contacte: hofer@ecm.ub.edu
Web:

Facultat de Física, Dijous 09 de Juny de 2016, a les 14:00h

Seminari del Dep. de Física Quàntica i Astrofísica

Títol: EFT analyses of New Physics searches: from nuclei to the LHC
Conferenciant: Martín González-Alonso (IPN Lyon)
Abstract:

Effective Field Theories (EFT) are a useful tool to analyze and compare different New Physics searches in a model-independent way. Moreover, they can be used to re-interpret any given SM test as a constraint on the New Physics parameter space. I will discuss its application to different cases, such as nuclear beta decay, semileptonic kaon decays or Higgs physics. The necessary QCD input will be also discussed with some detail.

Lloc: Aula 507
Contacte: hofer@ecm.ub.edu
Web:

Facultat de Física, Dilluns 13 de Juny de 2016, a les 14:30h

Seminari de l'Institut de Ciències del Cosmos

Títol: Local constraints on Dark Matter theories
Conferenciant: Jorge Peñarrubia (Royal Observatory of Edinburgh)
Abstract:

The nature of Dark Matter (DM) is a key question in modern Physics and Cosmology. To date the problem remains wide open, to the point that it is not yet known whether DM is made of exotic particles which formed shortly after the Big Bang or a manifestation of gravitational interactions that go beyond General Relativity. In this talk I will argue that the non-linear growth of structures in the Universe holds detailed information on the microscopic properties of DM. In this context, dwarf spheroidal galaxies, being the faintest, smallest and most DM-dominated galaxies known to us, provide excellent laboratories to test a wide range of cosmological theories on galactic scales. Finally, I will review current constraints on a Warm, Self-Interacting and Axion DM model derived from the chemo-dynamical modelling of Milky Way dwarf spheroidals and discuss future opportunities in this field.

Lloc: DAM Seminar room (724)
Contacte: secretaria@icc.ub.edu
Web: http://icc.ub.edu/activity/734

Facultat de Física, Dilluns 20 de Juny de 2016, a les 12:00h

Seminari de l'Institut de Ciències del Cosmos

Títol: Testing neutrino physics with cosmological observables
Conferenciant: Elena Giusarma (Carnegie Mellon University)
Abstract:

One of the great puzzles related to the LambdaCDM model is the nature of the dark matter (DM) component. In standard cosmology, hot, thermal relics are identified with the three light, active neutrinos which are sub-eV elementary particles which, apart from gravity, only interact via weak interactions. From neutrino oscillation experiments we know that neutrinos have masses but they are not sensitive to the absolute neutrino mass scale. Cosmology provides an independent tool to tackle the absolute scale of neutrino and to study its properties. In this talk I will illustrate the implications of neutrino properties on cosmological observables, in particular on the Cosmic Microwave Background radiation and on Large Scale Structure, and I will review the present constraints on neutrino masses also describing the sensitivities of cosmological data on neutrino mass splitting.

Lloc: Aula Pere Pascual (507)
Contacte: miralda@icc.ub.edu
Web: http://icc.ub.edu/activity/742

Facultat de Física, Divendres 15 de Juliol de 2016, a les 15:00h

Seminari del Dep. de Física de la Matèria Condensada

Títol: The mean field solution for Hard Sphere Jamming and a new scenario for the low temperature landscape of glasse
Conferenciant: Giorgio Parisi (Sapienza Università di Roma)
Abstract:

In a hard spheres systems particles cannot overlap. Increasing the density
we reach a point where most of the particles are blocked and the density
cannot be increased any more: this is the jamming point. The jamming point
separates the phase, where all the constraint can be satisfied, from an
unsatifiable phase, where spheres do have to overlap.
A scaling theory of the behavior around the jamming critical point has been
formulated and a few critical exponents have been introduced. The exponents
are apparently super-universal, as far as they do seem to be independent
from the space dimensions.
The mean field version of the model (i.e. the infinite dimensions limit) has
been solved analytically using broken replica symmetry techniques and the
computed critical exponents have been found in a remarkable agreement with
three-dimensional and two-dimensional numerical results and experiments.
The theory predicts in hard spheres (in glasses) a new transition (the
Gardener transition) from the replica symmetric phase to the replica broken
phase at high density (at low temperature), in agreement with simulations on
hard sphere systems.
I will briefly discuss the possible consequences of this new picture on the
very low temperature behavior of glasses in the quantum regime.

Lloc: Aula Seminari 3.20, facultat de física, planta 3
Contacte: ritort@ub.edu
Web: http://ffn.ub.es/ritort/