The SEMPARIS seminar webserver hosts annoucements of all seminars taking place in Paris area, in all topics of physics, mathematics and computer science. It allows registered users to receive a selection of announcements by email on a daily or weekly basis, and offers the possibility to archive PDF or Powerpoint files, making it available to the scientific community.   [ More information ]

 Upcoming Seminars [Next 30 ] [ scheduler view ]

 Friday 16 November 2018, 11:00 at LPTHE, Bibliothèque SEM-LPTHE (Séminaire du LPTHE) cond-mat.stat-mech Paola Ruggiero ( SISSA Trieste ) Conformal field theory on top of a breathing Tonks-Girardeau gas Abstract: Conformal field theory (CFT) has been extremely successful in describing universal effects in critical one-dimensional (1D) systems, in situations in which the bulk is uniform. However, in many experimental contexts, such as quantum gases in trapping potentials and in several out-of-equilibrium situations, systems are strongly inhomogeneous. Recently it was shown that the CFT methods can be extended to deal with such 1D situations [1,2]: the system’s inhomogeneity gets reabsorbed in the parameters of the theory, such as the metric, resulting in a CFT in curved space. Here in particular we make use of CFT in curved spacetime to deal with the out-of-equilibrium situation generated by a frequency quench in a Tonks-Girardeau gas in a harmonic trap [3]. We show compatibility with known exact result and use this new method to compute new quantities, not explicitly known by means of other methods, such as the dynamical fermionic propagator and the one particle density matrix at different times. REFERENCES: [1] J. Dubail, JM. Stéphan, J. Viti, P. Calabrese, SciPost Phys. 2, 002 (2017). [2] S. Murciano, P. Ruggiero, P. Calabrese, To appear. [3] P. Ruggiero, Y. Brun, J. Dubail, To appear.

 Friday 16 November 2018, 14:00 at LPTHE, Library LPTHE-PPH (Particle Physics at LPTHE) hep-ph Avelino Vicente ( Valencia ) New physics in B-meson decays Abstract: Current B-physics data contain two intriguing tensions. First, the LHCb collaboration has reported on some anomalies in b-s transitions, with discrepancies with the Standard Model predictions in some angular observables and branching ratios and intriguing hints for lepton universality violation. And second, BaBar, Belle and LHCb have found compatible deviations in observables associated to b-c transitions, again hinting at the violation of lepton universality. We will review the proposed explanations for these tensions and focus on new physics models that can simultaneously address both anomalies. In particular, we will discuss gauge extensions of the Standard Model aiming at such goal.

 Friday 16 November 2018, 15:00 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall Stefanos Kourtis ( Boston University ) Solving constrained counting problems with tensor networks Abstract: In this talk, I will present newly developed physics-inspired methods for the solution of counting constraint satisfaction problems (#CSPs). #CSP instances can be reformulated as interacting models whose zero-temperature partition function represents the volume of the solution manifold. I will introduce practical methods to compute such partition functions based on tensor network contraction. In this formulation, computational complexity can be viewed as a manifestation of quantum entanglement, and controlling the growth of entanglement throughout tensor network contraction can yield a significant computation speedup. Using some hard counting problems as benchmarks, I will demonstrate that tensor network methods can be a useful tool for solving some hard classes of #CSPs. I will conclude with an outline of ongoing work on extensions of this framework, such as the simulation of existing and near-term quantum circuits.

 Monday 19 November 2018, 10:45 at LPTMC, Jussieu, tower 13-12, room 5-23 SEM-LPTMC (Séminaire du Laboratoire de Physique Théorique de la Matière Condensée) cond-mat.mes-hall Christophe Texier ( LPTMS Orsay ) Counting the equilibria of a directed polymer in a random medium and Anderson localisation Abstract: I will discuss a new connection between two different problems: the counting of equilibria of a directed polymer in a random medium (DPRM) and the problem of Anderson localisation for the 1D Schrödinger equation. Using the Kac-Rice formula, it is possible to express the mean number of equilibria of a DPRM in terms of functional determinants. In the one-dimensional situation, these functional determinants can be calculated thanks to the Gelfand-Yaglom method, showing that the mean number of equilibria of the DPRM growth exponentially with the length of the polymer, with a rate controlled by the generalized Lyapunov exponent (GLE) of the localisation problem (cumulant generating function of the log of the wave function). The GLE is solution of a spectral problem studied by combining numerical approaches and WKB-like approximation. Furthermore, the formalism can be extended in order to obtain the number of equilibria at fixed energy, providing the (annealed) distribution of the energy density of the line over the equilibria.

 Monday 19 November 2018, 11:00 at APC, PGG APC-COLLOQUIUM (Colloquium de l'APC) astro-ph Lisa Randall ( Harvard ) Darkly Charged Dark Matter Abstract: Generally physicists assume that dark matter is a single particle with no interactions in its own sector. We demonstrate that these assumptions are not necessarily true. In particular we show that dark matter can be charged under its own force, even if as light as the weak scale. We furthermore consider the possibility that only a fraction of the dark matter is charged, and can even form a disk inside the Milky Way

 Monday 19 November 2018, 14:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-STA (Séminaire de Physique Statistique, CEA/Saclay) cond-mat Jorge Kurchan ( ENS ) Toy Glasses and Toy Black Holes Abstract: The SYK model is a quantum fermionic spin glass model that has been recently recognized as a toy model for holography. At the basis of this is a (quasi) reparametrization symmetry that emerges at low temperature. Interestingly, this symmetry appears also, and for the same reasons, in the dynamics of glasses. An effective theory for reparametrizations has been constructed for SYK, a similar possibility was contemplated years ago for glasses.

 Monday 19 November 2018, 14:30 at IHES, Amphithéâtre Léon Motchane ( Séminaire Géométrie et groupes discrets ) MATH-IHES (TBA) hep-th Andrés Sambarino ( CNRS & IMJ-PRG ) Hausdorff dimension of a (stable) class of non-conformal attractors Abstract: The purpose of the talk is to explain a result in collaboration with B. Pozzetti and A. Wienhard expressing the Hausdorff dimension of certain attractors as a critical exponent. This class of attractors consists of limit sets of Anosov representations in PGLd (hence of non-conformal nature) that verify an extra open condition. If time permits, we will discuss implications of the formula to the geometry of the Hitchin component.

 Monday 19 November 2018, 16:30 at IHES, Amphithéâtre Léon Motchane ( Séminaire Géométrie et groupes discrets ) MATH-IHES (TBA) hep-th Ferrán Valdez ( UNAM & Max Planck Institute ) Big mapping class groups Abstract: Mapping class groups associated to surfaces whose fundamental group is not finitely generated are called "big", and their study is linked to classical problems in dynamics. In this talk, we discuss some of the basic properties of big mapping class groups, their simplicial actions, and how these can be used to prove that big mapping class groups "detect" surfaces or (if time allows) that the space of non-trivial quasimorphisms of a big mapping class group is infinite dimensional.

 Tuesday 20 November 2018, 11:00 at CPHT, Salle de conférences Louis Michel, bât. 6 IPN-X (Séminaire commun de physique théorique des particules IPN-CPHT-X) hep-ph Maximilian Attems ( Universidade de Santiago de Compostela & Universitat de Barcelona ) Real-time dynamics near a critical point Abstract: Ever since the discovery of the quark-Gluon plasma (QGP) the location of the critical point in the QCD phase diagram - the end point of the first-order transition between hadron matter and QGP - has been a main research goal for heavy-ion collison experiments. We use the gauge/gravity duality to study as first a four-dimensional, strongly-coupled gauge theory with a first-order thermal phase transition. In the dual gauge theory we calculate the evolution and saturation of the spinodal instability. We uncover a new surprising example of the applicability of hydrodynamics to systems with large gradients. We discover with shockwave collisions that in theories with a first-order phase transition, a long-lived, quasi-static state may be formed.

 Tuesday 20 November 2018, 11:00 at LPTMS, LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) physics Emmanuel Trizac ( LPTMS, Université Paris-Sud ) When random walkers help solving integrals Abstract: We will discuss the properties of a family of integrals involving the cardinal sine fuction, first studied by Borwein & Borwein. The aim is to provide a physicist’s perspective onto a curious change of behaviour occurring within this family, noticed when benchmarking computer algebra packages, and initially attributed to a bug. A number of non-trivial generalizations will be obtained.

 Tuesday 20 November 2018, 11:30 at IPN, Bâtiment 100, Salle A015 (  ) IPN-THEO (Séminaire du groupe de physique théorique de l'IPN Orsay) nucl-th Alessandro Pastore ( University of York ) Exploring pairing correlations along the nuclear chart (and beyond). Abstract: Nuclear superfluidity is an absolutely fascinating phenomenon: due to a resid- ual interaction, two fermion can couple and form a Cooper pair. The formation of the pairs impact macroscopic properties of the system. This was illustrated in the seminal paper of Bohr, Mottelson and Pines, by inspecting the excita- tion spectra of even-even and odd-odd nuclei. A lot of theoretical work has been done to investigate pairing correlations and their possible impact on the properties of the nuclear system. Despite such an effort several open questions concerning the underlying structure of the pairing interaction is still unknown. How to improve our knowledge? In my talk, I will focus on the description of pairing properties within Nuclear Energy Density functional theory by illus- trating how particular assumptions on the pairing interaction may have large effects on some particular experimental observables. The talk aims at trigger- ing a discussion between theory and experiment on future plans on how to tackle such a complicated, but definitely fascinating problem. Attachments: 2018_11_20_A_Pastore.pdf (293807 bytes)

 Tuesday 20 November 2018, 14:00 at APC, 646 A - Mondrian APC-TH (Seminar of the theory group of APC) hep-th Marcela Peláez ( Universidad de la Republica, Montevideo ) Perturbative study of infrared QCD Abstract: Quantum Chromodynamics, the microscopic theory of strong interaction, is asymptotically free. As a consequence, perturbation theory is a useful tool to study high energy phenomena. In the opposite regime, the infrared, QCD is believed to be non-perturbative. However, last decade lattice simulations have showed that the coupling constant is finite in the infrared and not so big. That makes us think that some features of infrared QCD could be understood using perturbation theory. Moreover, the completely gauge-fixed Lagrangian is not known in the infrared. We propose then to use a gauge-fixed Lagrangian motivated by lattice simulations and use perturbation theory to study the infrared. We find that the first loop correction for Yang-Mills propagators and vertices reproduces lattice results with great accuracy. In addition, I will present preliminary results for the two loop corrections which confirm the validity of perturbation theory in order to study of Yang-Mills quantities.

 Tuesday 20 November 2018, 14:30 at IHES, Amphithéâtre Léon Motchane PT-IHES (Séminaire de physique théorique de l'IHES) hep-th Anatoly Dymarsky ( University of Kentucky & IHES ) Timescale of ergodicity: when many-body quantum systems can be described by Random Matrix Theory? Abstract: In this talk I will argue that after certain timescale (which scales with the system size as L^{d+2}) dynamics of a local observable becomes universal and it can be described by a random matrix. This talks is based on https://arxiv.org/abs/1804.08626 and other recent works.

 Tuesday 20 November 2018, 16:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-HEP (Séminaire de physique des particules et de cosmologie) hep-ph Kfir Blum ( Weizmann Institute and CERN ) Galactic Rotation Curves vs. Ultra-Light Dark Matter Abstract: Bosonic ultra-light dark matter (ULDM) would form cored density distributions at the centre of galaxies. Numerical simulations suggest a scaling relation between the core and the virialised host halo. This prediction lends itself to observational tests, because it implies that the peak circular velocity, measured for the host halo in the outskirts of the galaxy, should approximately repeat itself in the central region. Contrasting this prediction to the measured rotation curves of dozens of well-resolved galaxies, we show that ULDM in the mass range $m\sim (10^{-22}\div 10^{-21})$~eV, which has been invoked as a possible solution to the small-scale puzzles of $\Lambda$CDM, is in tension with the data. Analysis of the Milky Way inner gravitational potential could probe ULDM up to $m< \sim 10^{-19}$~eV.

 Wednesday 21 November 2018, 14:00 at LPTENS, Bibliothèque Joel Scherk SEM-LPTENS (Seminaire du LPTENS) hep-th Connor Behan ( Stony Brook ) Duality and bootstrap for the long-range Ising model Abstract: The long-range Ising (LRI) model, defined to have interactions decaying as a power of the distance, undergoes a second-order phase transition with the critical exponents depending on the strength of this power. The corresponding CFTs, which are nonlocal as they lack a stress tensor, have for many years been advertised as interpolating between a mean-field theory and the short-range critical Ising model. However, the latter crossover raises conceptual questions due to three properties of the model that can be derived exactly. 1. The LRI has two relevant Z2-odd operators. 2. Both of their scaling dimensions are protected. 3. So are the scaling dimensions of odd-spin primaries in their OPE. I will describe a recently developed duality which reconciles these facts with what we know about the 2D and 3D Ising models.I will also show how the duality can be used to estimate the critical exponents when the usual Wilson-Fisher approach is strongly coupled. Finally, I will explain how the numerical bootstrap can be used to corner this model and present the results of a six-correlator scan. (based on 1810.07199 )

 Wednesday 21 November 2018, 14:15 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th Pierre Corvilain ( Utrecht University ) Anomalies on a circle and Infinite distance in Kaehler moduli space in F-theory Abstract: We consider a 4D theory with a chiral anomaly, on $R^3 \times S^1$. From the 3D perspective, it seems at first that the anomaly is lost since odd dimensions do not allow for local anomalies. However the anomaly cannot simply disappear, and by choosing a regulator that preserves the symmetries of the UV (4D lorentz invariance in this case) in order to integrate out the KK-modes, we show that field-dependant Chern-Simons terms are generated at one loop. These are not gauge invariant and in fact capture the whole 4D anomaly, in a 3D language. We further extend these results to 6D anomalies and comment on the implications for F-theory compactifications. Integrating out the KK-modes also leads infinite distance in radius modulus space. We explain how this relates to the Swampland Distance Conjecture and the idea of emergence. We then apply this to the F-theory circle and explain how it relates to infinite distances in the Kaehler moduli space of the Calabi-Yau three-fold on which F-theory is compactified. These singularities can be analyzed from their monodromy matrix, which depends on the intersection number of the CY. This suggests that some topological data of the CY are emergent.

 Wednesday 21 November 2018, 15:00 at IHES, Amphithéâtre Léon Motchane ( Séminaire de probabilités et physique statistique de l'IHES ) PT-IHES (Séminaire de physique théorique de l'IHES) hep-th Giovanni Antinucci ( University of Zurich ) A Hierarchical Supersymmetric Model for Weakly Disordered 3d Semimetals Abstract: An important conjecture in quantum mechanics is that non-interacting, disordered 3d quantum systems should exhibit a localization-delocalization transition as a function of the disorder strength. From a mathematical viewpoint, a lot is known about the localized phase for strong disorder, much less about the delocalized phase at weak disorder. In this talk I will present results for a hierarchical supersymmetric model for a class of 3d quantum systems, called Weyl semimetals. We use rigorous renormalization group methods to compute the correlation functions of the system. In particular, I will report a result about the algebraic decay of the averaged two-point correlation function, compatible with delocalization. Our method is based on a rigorous implementation of RG, reminiscent of the Gawedzki-Kupiainen block spin transformations; the main technical novelty is the multiscale analysis of Gaussian measures with purely imaginary covariances. Joint work with Luca Fresta and Marcello Porta.

 Wednesday 21 November 2018, 16:30 at IHES, Amphithéâtre Léon Motchane ( Séminaire de probabilités et physique statistique de l'IHES ) PT-IHES (Séminaire de physique théorique de l'IHES) hep-th Paul Melotti ( LPSM ) Kashaev's relation for the Ising model, and a loop model Abstract: In 1996 Rinat Kashaev introduced a new way to write the star-triangle move (or Yang-Baxter equations) of the Ising model as a single polynomial relation. In 2013 Richard Kenyon and Robin Pemantle understood that this relation could be seen as a kind of spatial recurrence. I will show how the iteration of Kashaev's recurrence can be related the combinatorics of a loop model with two colors, that was introduced for different reasons by Ole Warnaar and Bernard Nienhuis in 1993. It is also possible to couple this loop model with known relatives of the Ising model: a dimer model and a six-vertex model. Finally I will show a few limit shape phenomena.

 Thursday 22 November 2018, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th Ofer Aharony Renormalization group flows in disordered field theories Abstract: We will analyze the renormalization group (RG) flow of field theories with quenched disorder, in which the couplings vary randomly in space. We analyze both classical (Euclidean) disorder and quantum disorder, emphasizing general properties rather than specific cases. The RG flow of the disorder-averaged theories takes place in the space of their coupling constants and also in the space of distributions for the disordered couplings, and the two mix together. We write down a generalization of the Callan-Symanzik equation for the flow of disorder-averaged correlation functions. We find that local operators can mix with the response of the theory to local changes in the disorder distribution, and that the generalized Callan-Symanzik equation mixes the disorder averages of several different correlation functions. For classical disorder we show that this can lead to new types of anomalous dimensions and to logarithmic behavior at fixed points. For quantum disorder we find that the RG flow always generates a rescaling of time relative to space, which at a fixed point generically leads to Lifshitz scaling. The dynamical scaling exponent z behaves as an anomalous dimension and we compute it at leading order in perturbation theory in the disorder for a general theory. We also find in quantum disorder that local operators mix with non-local (in time) operators under the RG, and that there are critical exponents associated with the disorder distribution that have not previously been discussed. (based on 1803.08529 )

 Thursday 22 November 2018, 11:00 at IHES, Amphithéâtre Léon Motchane PT-IHES (Séminaire de physique théorique de l'IHES) hep-th Jens Hoppe ( IHES ) Separable Minimal Hypersurfaces Abstract: A classification will be given of all separable minimal hypersurfaces in $R^{n≥3}$.

 Thursday 22 November 2018, 11:40 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th George Papadopoulos ( King's College, London ) Superconformal symmetry and classification of black hole horizons Abstract: The horizon conjecture states that all near horizon geometries of extreme black holes that preserve some supersymmetry exhibit an sl(2, R) symmetry. I shall demonstrate the proof of the conjecture in some theories and use it to identify all the Killing superalgebras of near horizon geometries. An application of these results is that there are no near horizon geometries that preserve strictly more than 16 supesymmetries in 10 and 11 dimensions.

 Thursday 22 November 2018, 14:00 at LPTM, 4.13 St Martin II SEM-LPTM-UCP (Seminaires du LPTM , Universite de Cergy Pontoise) math-ph Samuel Colin ( LPTM UCP Cergy Pontoise ) Early Universe in the de Broglie-Bohm pilot-wave theory Abstract: According to the de Broglie-Bohm pilot-wave theory, a quantum system is not only described by its wave-function, but also by a configuration, which is guided by the wave-function in a deterministic way (in the case of a non relativistic particle, this configuration is simply a particle position). A quantum ensemble, on the other hand, is described by a wave-function and by a distribution of configurations. The pilot-wave theory reproduces the predictions of standard quantum mechanics for ensembles in which the configurations are distributed according to the Born Law. In principle, the pilot-wave theory also allows ensembles in which the configurations are not distributed according to the Born Law: such ensembles are said to be in quantum non-equilibrium and for them standard quantum mechanics is violated, thereby leading to new physics. In the talk, I will give an overview of the pilot-wave theory and I will present this idea of quantum non-equilibrium. Then I will show that quantum non-equilibrium can provide an explanation for an anomaly in the data of the Planck satellite mission (it is an anomalous power deficit at large angular scales in the cosmic microwave background spectrum). Finally, I will give an example of the application of the pilot-wave approach to simple quantum cosmological models, to show that the existence of a configuration, beside the wave-function, allows to obtain cosmological scenarios unambiguously (here the example will be that of a bouncing universe with a dark energy phase during its expansion).

 Thursday 22 November 2018, 16:00 at LPT, 114 LPT-PTH (Particle Theory Seminar of LPT Orsay) hep-th Savvas Zafeiropoulos ( Heidelberg U. ) Parton-pseudo distribution functions from Lattice QCD Abstract: The light-cone definition of Parton Distribution Functions (PDFs) does not allow for a direct ab initio determination employing methods of Lattice QCD simulations that naturally take place in Euclidean spacetime. In this presentation we focus on pseudo-PDFs where the starting point is the equal time hadronic matrix element with the quark and anti-quark fields separated by a finite distance. We focus on Ioffe-time distributions, which are functions of the Ioffe-time $\nu$, and can be understood as the Fourier transforms of parton distribution functions with respect to the momentum fraction variable $x$. We present lattice results for the case of the nucleon and we also perform a comparison with the pertinent phenomenological determinations.

 Friday 23 November 2018, 16:00 at IPHT, Salle Claude Itzykson, Bât. 774 IPHT-MAT (Séminaire de matrices, cordes et géométries aléatoires) hep-th Monica Jinwoo Kang ( Harvard ) (TBA) Abstract: (TBA)

 Tuesday 27 November 2018, 11:00 at CPHT, Salle de Conference Louis Michel (Bât.6 CPHT) SEM-CPHT (Séminaire du CPHT) hep-th Swapnamay Mondal ( LPTHE Jussieu ) Fuzz in the horizon ? Abstract: We investigate the space of BPS states in type IIA string theory on a T6 wrapped by one D6 brane and three D2 branes wrapping three disjoint 2- tori. This system of branes has 12 ground states. We show that these 12 states are all recovered as Coulomb branch BPS multicenter bound states, in which each center preserves 16 supercharges. Moreover, we show that these multicenter solutions can only exist with zero angular momentum, supporting the conjecture that all black hole microstates have zero angular momentum. For large charges, they might describe “near-horizon limit” of fuzzballs.

 Tuesday 27 November 2018, 11:00 at LPTMS, LPTMS, salle 201, 2ème étage, Bât 100, Campus d'Orsay LPTMS (Séminaire du Laboratoire de Physique Théorique et Modèles Statistiques (Orsay)) physics Alexandre Krajenbrink TBA Abstract: TBA

 Tuesday 27 November 2018, 11:30 at LPTENS, LPTENS library STR-LPT-ENS-HE (Séminaire commun LPTENS/LPTHE) hep-th Shira Chapman ( Amsterdam ) TBA

 Tuesday 27 November 2018, 14:00 at APC, 646 A - Mondrian APC-TH (Seminar of the theory group of APC) hep-th Michele. Oliosi ( Yukawa Institute, Kyoto ) TBA

 Wednesday 28 November 2018, 11:30 at IPN, Bâtiment 100, Salle A015 (  ) IPN-THEO (Séminaire du groupe de physique théorique de l'IPN Orsay) nucl-th X. Roca-Maza ( Università degli Studi di Milano and INFN, Via Celoria 16, 20133 Milano, Italy. ) Spin-isospin resonances with the new functionals: SAMi, SAMi-ISB and SAMi-T. Abstract: In this seminar, I will review some recent developments of the Milano group in the study of spin-isospin resonances with Skyrme functionals. In the past, different attempts to build a functional that can describe nuclear masses, charge radii and excitation energies of non-charge exchange and charge exchange resonances at the same time have been performed [1-4]. On this regard, we have proposed in Ref. [5] a new functional named SAMi based on a fitting protocol that allows for a better description of spin-isospin resonances without compromising the accuracy in the description of other observables. Subsequently, in Ref. [6] we have further improved the SAMi functional by including tensor terms. For that, we have kept the same fitting protocol of SAMi but including also information from ab initio calculations on neutron and neutron-proton drops to determine the tensor terms. The new functional has been named SAMi-T. In parallel to the latter work, we have also improved the SAMi functional in the description of the Isobaric Analog State (IAS), a pure isospin resonance. Such improvement has been achieved by the inclusion of isospin symmetry breaking terms to the functional [7]. The new interaction is named SAMi-ISB. In this case, the SAMi fitting protocol has been extended to also include information on ab initio results of ISB corrections to the symmetric matter equation of state and of the IAS in $^{208}$Pb.\newline [1] N. Giai and H. Sagawa, Phys. Lett. B 106, 379 (1981).\newline [2] P.-G. Reinhard, D. J. Dean, W. Nazarewicz, J. Dobaczewski, J. A. Maruhn, and M. R. Strayer, Phys. Rev. C 60, 014316 (1999).\newline [3] N. Paar, T. Niksic, D. Vretenar, and P. Ring, Phys. Rev. C 69, 054303 (2004).\newline [4] H. Liang, N. Van Giai, and J. Meng, Phys. Rev. Lett. 101, 122502 (2008).\newline [5] X. Roca-Maza, G. Colò and H. Sagawa, Phys.Rev. C 86, 031306 (2012).\newline [6] Shihang Shen, G. Colò and X. Roca-Maza, arXiv:1810.09691 (2018) (Submitted to PRC)\newline [7] X. Roca-Maza, G. Colò, and H. Sagawa, Phys. Rev. Lett. 120, 202501 (2018) Attachments: 2018_11_28_R_Maza.pdf (212359 bytes)

 Thursday 29 November 2018, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th Olivier Debarre ( DMA, ENS ) Variétés de Calabi-Yau et variétés hyperkählériennes Abstract: Les variétés de Calabi-Yau sont les variétés complexes compactes kählériennes de dimension $n$ qui ont une $n$-forme holomorphe qui ne s'annule nulle part (la définition varie dans la littérature). Elles se répartissent en trois grandes catégories : les tores complexes, les variétés de Calabi-Yau « strictes », et les variétés hyperkählériennes, qui possèdent une 2-forme symplectique holomorphe. Ces dernières sont les plus rares. J'expliquerai quelques constructions connues. (based on 1607.08467 )

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