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Training
Le groupe de renormalisation fonctionnelle : Introduction et applications en matière condensée quantique
2025-01-16Le cours a pour but d’introduire un large public à la version moderne du groupe de renormalisation Wilsonien.
Contact: Tmljb2xhcyUyMER1cHVpcw==
Upcoming thesis defenses
- 2024-09-09 : Veronica Collazuol (IPHT)
Exploring infinite distance limits in string moduli spacesAt : Institut de Physique Théorique Orme des Merisiers bâtiment 774, F-91191 Gif-sur-Yvette Cedex, Amphitheatre Claude Bloch , on 15:00
The string landscape is vast, and to many extents still unexplored. Nevertheless, in string compactifications it has been observed that common features appear, which are independent of the compactification itself, and that are believed to be deeply related to the quantum gravitational nature of the theory. Along these lines, the Swampland program aims to understand from a bottom-up perspective the conditions that an effective field theory should obey in order to be consistently UV completed to quantum gravity, for which string theory is, as of now, the most satisfactory framework. These constraints are currently expressed as a series of conjectures, which at a given energy divide the space of effective field theories into Landscape (namely, the ones that come from quantum gravity) and Swampland (the ones that despite being consistent as quantum field theories e.g. anomaly free, cannot be consistently coupled to quantum gravity). A typical feature of string compactifications is the presence of moduli, massless scalar fields with flat potential whose kinetic term in the supergravity action plays the role of a metric in a space parametrized by the moduli themselves, the so-called moduli space. Related to this, one of the most widely accepted conjectures, the Distance Conjecture, states that moving an infinite distance in the moduli space of a theory of quantum gravity, an infinite tower of states becomes exponentially light in the geodesic distance. In this thesis, we focused on some aspects of this conjecture in specific string theory settings. Firstly, we studied how these infinitely many states enhance the symmetry algebras in decompactification limits of Heterotic and CHL strings on d-dimensional tori, which correspond to gauge theories of rank 16+d and 8+d, respectively. In both cases, using the worldsheet theory we showed that taking k leq d radii to infinity, the algebras that emerge are the affine version of the ones in the higher 10-d+k dimensional theory we are decompactifying to. Moreover, we show that the decompactification of the CHL theory to the Heterotic one, which is accompanied by rank enhancement of the gauge symmetry, is associated with the presence of a twisted version of the affine algebra. Finally, we show that in the simple setting of symmetric moduli spaces (such as those of toroidal M- and string theory compactifications), there is a natural connection between the geometry of the moduli space and the string spectrum. We parametrize the boundary of these moduli spaces and characterize the behaviour of the geodesics at infinity, and assuming a lattice of states as well as using completeness of the spectrum we prove the Distance Conjecture in these setups.
- 2024-09-10 : Vincent Menet (LPTHE)
Géometrie Généralisée (Exceptionnelle) des vides non-supersymétriques avec FluxAt : Bibliothèque du LPTHE, Campus Jussieu, 4 place Jussieu, 75005 Paris , on 14:00
- 2024-09-16 : Anthony Guillen (LPTHE)
Sujets variés en théorie des cordes et en phénoménologie : secteurs sombres, stabilisation des modules, inflation. « Topics in string theory and phenomenology : dark sectors, moduli stabilisation, inflation »At : Bibliothèque du LPTHE, Campus Jussieu, tour 13-14-4ème étage, 4 place Jussieu 75005 Paris , on 17:00
- 2024-09-20 : Laura Michel (LPENS)
Métamatériaux mécaniques modèles pour le stockage de mémoire et le calculAt : Salle Conf IV (E244) 24 Rue Lhomond, 75005 Paris, Laboratoire de Physique de l’Ecole Normale Supérieure , on 14:00
- 2024-09-20 : Louis Haurie (IPHT)
Strongly correlated Hubbard model within the composite operator formalismAt : CEA, Orme des Merisiers Bat 774, 91191 Gif-sur-Yvette, IPhT, salle Itzykson , on 14:00
This manuscript considers a strong coupling approach starting with the expected ground-state of a Mott insulator obtained for a large Coulomb electronic repulsion term with a square lattice. The Hubbard operators are good excitations for this interaction term, as they describe properly the Mott phase. Hopping is then considered in an equation of motion treatment of Hubbard model. An approximation is performed to truncate the currents of the Hubbard operators and allow for a self-consistent framework. Different sets of self-consistent equations are typically considered in the literature and are firstly analyzed for translationally invariant systems. The method violates Luttinger’s theorem and is only particle-hole symmetric with nearest-neighbors. We then extend it to study d-wave superconductivity and longer-range hopping. While we managed to stabilize superconductivity, we show it is non-zero only in the vicinity of a Van Hove singularity. As longer ranged hoppings are included, the Van hove singularity is moved away to higher doping and so does the superconductivity peak. Finally, a two-orbital Hubbard model is considered as an application case of the method. For small enough inter-orbital hopping and no inter-orbital interaction, a spontaneous orbital symmetry breaking is observed. In the absence of inter-orbital hopping, the resulting phase is unhybridized and has one orbital close to half-filling, presenting the characteristic features of the orbital-selective Mott phase without having to consider any Hund term. As the inter-orbital hopping is switched on, this selective Mott phase survives but becomes slightly hybridized and with an orbital not exactly half-filled anymore. Past a critical value, this orbital selective phase is broken and the system goes in an orbital uniform phase.
- 2024-09-25 : Florentin Daniel (LPENS)
Instabilités et transport turbulent dans les systèmes hydrodynamiques astrophysiquesAt : Salle Conférences IV 24 rue Lhomond, Ecole normale supérieure, Département de physique, 75005 Paris , on 14:00
- 2024-10-01 : Valentin Mouet (LPENS)
Dynamique et transport dans les écoulements diphasiquesAt : Amphithéâtre Institut Pierre-Gilles de Gennes (IPGG) 6 rue Jean Calvin 75005 Paris , on 14:00
- 2024-10-02 : Zofia Bratasz (IL)
Avancées en holographie laser doppler pour l’imagerie du flux sanguin rétinienAt : Amphithéâtre IPGP 1 rue Jussieu, 75005, Paris , on 14:00
- 2024-10-04 : Guillaume Sintès (GULLIVER)
Auto-assemblage dynamique de bactéries dans des cristaux liquideAt : 1 Sorbonne université, 4 Pl. Jussieu, 75005 Paris , on 14:00
- 2024-10-11 : Louise Régnier (PCC)
Low-Temperature and Polarization Multifocus imaging for multidimensional Single Molecule Localization MicroscopyAt : Amphithéâtre Marie Curie, 1 rue Pierre et Marie Curie, 75005 Paris , on 10:00
- 2024-10-15 : Nirbhay Patil (LPENS)
The Prince and the Pauper and the Physics: A statistical mechanics approach to understanding economic inequalities- 2024-10-15 : Thomas Alline (MSC)
Mécanobiologie de la croissance du poil racinaire : réponses aux contraintes mécaniques et mesure de l’élasticité de la paroi primaireAt : Batiment Condorcet "Amphithéâtre Pierre-Gilles de Gennes" 10 rue Alice Domont et Léonie Duquet Paris , on 09:30
- 2024-10-17 : Joseph Vermeil (PMMH)
La mécanique du cortex d’actine caractérisée à l’aide du magnetic pincherAt : Amphithéatre de l’IPGG , on 14:00
Events
Call for projects and applications
- Mission doctorales de diffusion et de médiation scientifique 2024 - DIM QuanTiP 2024-07-15
Deadline Saturday, September 14 2024 at MidnightLe/la doctorant·e recruté∙e dans le cadre de la mission de diffusion et de médiation scientifique participe à l’élaboration et à la mise en place de diverses actions visant à sensibiliser le grand public et le public scolaire à la physique quantique et ses applications.
- INSP (ex-ENA) SM concours d’entrée réservé aux titulaires d’un diplôme de doctorat 2023-02-02
Un concours externe spécial d’entrée à l’INSP (ENA) sera ouvert en 2023, réservé aux titulaires d’un doctorat pour l’accès aux emplois de la haute fonction publique (administrateur de l’Etat, par exemple au ministère de la transition écologique ou de l’enseignement supérieur et de la recherche, en juridiction administrative ou financière, inspection générale, préfectorale, carrière diplomatique, etc.). Trois épreuves sont au programme: une note sur dossier, un entretien, un oral d’anglais. Une préparation à distance et sans frais est envisagée, assurée comme chaque année par un membre de l’association des anciens élèves de l’ENA/INSP. Pour toute demande d’inscription à la préparation, s’adresser pour le concours docteurs INSP directement à prepa.insp@mail.com ou, pour les autres concours INSP, à l’université de Strasbourg marcsimon@unistra.fr, directeur de la classe préparatoire de sciences-po aux concours de la haute fonction publique. Le nombre de places étant limité, les demandes d’inscription à la préparation seront traitées par ordre de réception.
News briefs
Recent job offers
- 2024-07-26th – poste chercheur permanent CEA Saclay, physique/mécanique des métamatériaux
- 2024-07-17th – Chargé d'affaire à UPCité Contact : Webmaster EDPIF
- 2024-09-10 : Vincent Menet (LPTHE)