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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:20180529T073000Z
DTEND:20180529T090000Z
DTSTAMP:20180624T185700Z
CREATED:20180516T111506Z
LAST-MODIFIED:20180516T111506Z
UID:164-1527579000-1527584400@jacobi.fis.ucm.es
SUMMARY:Enrique Rico Ortega
DESCRIPTION:Ponente: Enrique Rico Ortega\nTítulo: SO(3) 'Nuclear Physics' with ultracold Gases\nFecha: Martes 29 de mayo \nHora: 11:30\nLugar: Seminario de Fisica Teorica 2ªplanta\nAbstract:An ab initio calculation of nuclear physics from Quantum Chromodynamics (QCD)\, the fundamental SU(3) gauge theory of the strong interaction\, remains an outstanding challenge. Here\, we discuss the emergence of key elements of nuclear physics using an SO(3) lattice gauge theory as a toy model for QCD. We show that this model is accessible to state-of-the-art quantum simulation experiments with ultracold atoms in an optical lattice. First\, we demonstrate that our model shares characteristic many-body features with QCD\, such as the spontaneous breakdown of chiral symmetry\, its restoration at finite baryon density\, as well as the existence of few-body bound states. Then we show that in the one-dimensional case\, the dynamics in the gauge invariant sector can be encoded as a spin S=32 Heisenberg model\, i.e.\, as quantum magnetism\, which has a natural realization with bosonic mixtures in optical lattices\, and thus sheds light on the connection between non-Abelian gauge theories and quantum magnetism.
URL:http://jacobi.fis.ucm.es/wordpress/seminario/enrique-rico-ortega/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28040\, España
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BEGIN:VEVENT
DTSTART:20180530T103500Z
DTEND:20180530T120000Z
DTSTAMP:20180624T185700Z
CREATED:20180521T111222Z
LAST-MODIFIED:20180521T113025Z
UID:170-1527676500-1527681600@jacobi.fis.ucm.es
SUMMARY:Raúl Briceño
DESCRIPTION:\nPonente: Raúl Briceño\, "Jefferson Lab\, Virginia\, USA"\n\nTítulo: Few-hadron systems from QCD\nFecha: Miércoles 30 de mayo\nHora: 14:35\nLugar: Seminario de Fisica Teorica 2ªplanta\n\n\nAbstract: The non-perturbative nature of quantum chromodynamics (QCD) has historically left a gap in our understanding of the connection between the fundamental theory of the strong interactions and the rich structure of experimentally observed phenomena. For the simplest properties of stable hadrons\, this is now circumvented by using lattice QCD. In this talk I discuss a path that will allow us to access a variety of previously unexplored sectors of QCD. As a proof of principle\, I will focus my attention to the isoscalar mesonic sector of QCD. Carrying the quantum numbers of the vacuum\, this is perhaps one the most interesting channels in hadronic physics.\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/raul-briceno/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28040\, España
END:VEVENT
BEGIN:VEVENT
DTSTART:20180605T103000Z
DTEND:20180605T120000Z
DTSTAMP:20180624T185700Z
CREATED:20180518T094804Z
LAST-MODIFIED:20180601T110446Z
UID:169-1528194600-1528200000@jacobi.fis.ucm.es
SUMMARY:Milva Orsaria
DESCRIPTION:Fecha: martes 5 de junio\n\nLugar: Seminario de Física Teórica II\n\nHora: 14:30\n\nPonente: Milva Orsaria (Universidad Nacional de la Plata\, Argentina)\n\nTitulo: Quark matter in the core regions of massive neutron stars (?)\n\nResumen:\n\nThe study of neutron stars establishes a direct connection between\nastronomy and nuclear and particle physics\, allowing a better\nunderstanding of the behavior of matter under conditions that are\ndifficult to reach in the laboratory. Massive neutron stars provide\nvery important constraints on high-density nuclear matter and its\nassociated Equation of State (EoS)\, which is still essentially\nunknown. Depending on neutron star mass and rotational frequency\,\ngravity may compress the matter in the core regions of such objects up\nto more than ten times the density of ordinary atomic nuclei\, thus\nproviding a high-pressure environment in which numerous subatomic\nparticle processes are likely expected to compete with each other and\nphase transitions to new states of matter\, foremost quark matter\, may\noccur. In this talk\, I will provide a general discussion of the\nproperties of quark matter and explore its role for the core\ncomposition of neutron stars.\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/milva-orsaria/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28040\, España
END:VEVENT
BEGIN:VEVENT
DTSTART:20180606T103000Z
DTEND:20180606T120000Z
DTSTAMP:20180624T185700Z
CREATED:20180531T080519Z
LAST-MODIFIED:20180531T080541Z
UID:172-1528281000-1528286400@jacobi.fis.ucm.es
SUMMARY:Alexandre Dauphin
DESCRIPTION:Ponente: Alexandre Dauphin\nTítulo: Identifying Quantum Phase Transitions with Adversarial Neural Networks\nFecha: Miércoles 6 de junio\nHora: 14:30\nLugar: Seminario de Fisica Teorica 2ªplanta\nResumen:\nThe identification of phases of matter is a challenging task\, especially in quantum mechanics\, where the complexity of the ground state appears to grow exponentially with the size of the system. We address this problem with state-of-the-art deep learning techniques: adversarial domain adaptation. We derive the phase diagram of the whole parameter space starting from a fixed and known subspace using unsupervised learning. The input data set contains both labeled and unlabeled data instances. The first kind is a system that admits an accurate analytical or numerical solution\, and one can recover its phase diagram. The second type is the physical system with an unknown phase diagram. Adversarial domain adaptation uses both types of data to create invariant feature extracting layers in a deep learning architecture. Once these layers are trained\, we can attach an unsupervised learner to the network to find phase transitions. We show the success of this technique by applying it on several paradigmatic models: the Ising model with different temperatures\, the Bose-Hubbard model\, and the SSH model with disorder. The input is the ground state without any manual feature engineering\, and the dimension of the parameter space is unrestricted. The method finds unknown transitions successfully and predicts transition points in close agreement with standard methods. This study opens the door to the classification of physical systems where the phases boundaries are complex such as the many-body localization problem or the Bose glass phase.
URL:http://jacobi.fis.ucm.es/wordpress/seminario/172/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28011\, España
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BEGIN:VEVENT
DTSTART:20180613T103000Z
DTEND:20180613T120000Z
DTSTAMP:20180624T185700Z
CREATED:20180509T091045Z
LAST-MODIFIED:20180608T095220Z
UID:163-1528885800-1528891200@jacobi.fis.ucm.es
SUMMARY:Jose Manuel Alarcon
DESCRIPTION:Ponente: José Manuel Alarcón\n\nTítulo: Novel calculation of the nucleon form factors with Dispersively Improved EFT\nFecha: Miércoles 13 de junio \nHora: 14:30\nLugar: Seminario de Fisica Teorica 2ªplanta\n\n\nAbstract: The form factors of the nucleon are quantities of wide use in the forefront of nuclear physics research. Its calculation from first principles approaches is still an open problem that limits our knowledge of the nucleon. In this talk I will show how\, using constrains from unitarity\, one can find a representation for the spectral functions much better suited for chiral effective field theory. This new approach\, that we called Dispersively Improved Chiral Effective Field Theory\, overcomes the known limitations of previous chiral calculations\, and becomes competitive with other ab initio determinations of the nucleon form factors. Finally\, I will comment on the impact of our results on the current hadron and nuclear physics research programs.\n\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/jose-manuel-alarcon/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28040\, España
END:VEVENT
BEGIN:VEVENT
DTSTART:20180619T103000Z
DTEND:20180619T120000Z
DTSTAMP:20180624T185700Z
CREATED:20180614T082639Z
LAST-MODIFIED:20180614T082639Z
UID:175-1529404200-1529409600@jacobi.fis.ucm.es
SUMMARY:Carlos Sabín
DESCRIPTION:Martes 19 de junio\nHora: 14:30\nSeminario Física Teórica 2ªplanta\n\nPonente: Carlos Sabín\n\nTítulo:Multimode parametric amplification of the quantum vacuum for quantum computing\n\nResumen: The Dynamical Casimir Effect (DCE) consists in the generation of photons out of the vacuum of a quantum field by means of the non-adiabatic modulation of boundary conditions -e.g. a mirror oscillating at speeds comparable to the speed of light. Predicted in 1970\, an experimental demonstration remained elusive until 2011\, when it was implemented in a superconducting circuit architecture. In addition to its fundamental interest\, it has been shown that the radiation generated in the DCE displays bipartite and multipartite entanglement as well as other forms of quantum correlations\, which poses the question of its utility as a resource for the heralded quantum-technological revolution. In this talk\, we establish a bridge between multimode parametric amplification induced by the modulation of boundary conditions - for which DCE is a paradigmatic case- and quantum computing devices.\n\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/carlos-sabin/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28011\, España
END:VEVENT
BEGIN:VEVENT
DTSTART:20180627T110000Z
DTEND:20180627T123000Z
DTSTAMP:20180624T185700Z
CREATED:20180619T085923Z
LAST-MODIFIED:20180619T090708Z
UID:177-1530097200-1530102600@jacobi.fis.ucm.es
SUMMARY:Breno Giacchini
DESCRIPTION:Fecha y hora: Miércoles 27 de junio\, 15:00\nLugar: Seminario de Física Teórica 3º planta\n\n\nPonente: Breno L. Giacchini (CBPF\, Río de Janeiro)\n\nTítulo: Regularities in polynomial higher-derivative gravities.\n\nAbstract:\nIn this talk we present some results on regular solutions in linearized polynomial higher-derivative gravity models. In the first part we discuss the Newtonian limit and we show that\, even though fourth-order gravity still has curvature singularities\, any model with at least six derivatives in both spin-2 and spin-0 sectors is regular when coupled to a pointlike mass. In the second part of the talk we discuss the collapse of a small mass\, considered as a spherical superposition of gyratons. Similarly to the static case\, for models with more than four derivatives the Kretschmann scalar is regular during the collapse of a thick null shell. We also verify the existence of the mass gap for the formation of mini black holes even if complex and/or degenerate poles are allowed\, generalizing previous considerations on the subject and covering the case of Lee-Wick gravity. These interesting regularity properties of sixth- and higher-derivative models at the linear level reinforce the question of whether there can be nonsingular black holes in the full nonlinear model.\n\n\n
URL:http://jacobi.fis.ucm.es/wordpress/seminario/breno-giacchini/
LOCATION:Avenida Complutense\, Madrid\, Madrid\, 28011\, España
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