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(37) Production(s) de l'année 2024
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Electrostatics in PNIPAm-based microgels: From two-step deswelling to polyelectrolyte and nanoparticle adsorption 
Auteur(s): Truzzolillo D.
Conference: Microgels 2024 - Functional Microgels and Microgel Systems (Montabaur, DE, 2024-04-02)
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Contactless Measurement for Quantum Phenomenon Studies in Graphite
Auteur(s): Coillot C.
(Document sans référence bibliographique)
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An index for flux vacua
Auteur(s): Lüst S.
(Document sans référence bibliographique) 2024-05-07Texte intégral en Openaccess : 
Ref HAL: hal-04572367_v1
Ref Arxiv: 2405.04584
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: We propose to use the winding number of the gradient of a scalar potential as a simple topological index that relates critical points in the interior of the scalar field space to the behavior of the potential at the (asymptotic) boundary of the field space. We demonstrate this technique for supersymmetric flux compactifications of M-theory on Calabi-Yau four-folds, and use the Fermat sextic as a simple, one-parameter example.
Commentaires: 43 pages, 3 figures
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Étude micromécanique et microstructurale au sein de l’albumen amylacé du grain de blé par AFM
Auteur(s): Ramonda Michel, Arnould Olivier, George M., Delenne Jean-Yves, Lullien-Pellerin Valérie
(Affiches/Poster)
25e forum des microscopies à sonde locale (Lyon, FR), 2024-04-22
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Quantum thermodynamics of boundary time-crystals
Auteur(s): Carollo Federico, Lesanovsky Igor, Antezza M., De Chiara G.
(Article) Publié:
-Quantum Science And Technology, vol. 9 p.035024 (2024)
DOI: 10.1088/2058-9565/ad3f42
Résumé: Time-translation symmetry breaking is a mechanism for the emergence of non-stationary many-body phases, so-called time-crystals, in Markovian open quantum systems. Dynamical aspects of time-crystals have been extensively explored over the recent years. However, much less is known about their thermodynamic properties, also due to the intrinsic nonequilibrium nature of these phases. Here, we consider the paradigmatic boundary time-crystal system, in a finite-temperature environment, and demonstrate the persistence of the time-crystalline phase at any temperature. Furthermore, we analyze thermodynamic aspects of the model investigating, in particular, heat currents, power exchange and irreversible entropy production. Our work sheds light on the thermodynamic cost of sustaining nonequilibrium time-crystalline phases and provides a framework for characterizing time-crystals as possible resources for, e.g. quantum sensing. Our results may be verified in experiments, for example with trapped ions or superconducting circuits, since we connect thermodynamic quantities with mean value and covariance of collective (magnetization) operators.
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Introduction to topological string theory
Auteur(s): Alexandrov S.
(Séminaires)
Boğaziçi University (Istanbul, TR), 2024-04-23
Résumé: I'll review the construction of topological string theory which has a lot of applications in usual string theory and mathematics. I'll start by summarizing the geometry of Calabi-Yau manifolds, where topological strings will be defined, introduce topological twist, define A and B models, and discuss a relation to F-terms in the effective action of type II strings. In the end, I'll explain the wave function property related to the issue of background independence.
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Modular bootstrap for compact Calabi-Yau threefolds
Auteur(s): Alexandrov S.
(Séminaires)
Boğaziçi University (Istanbul, TR), 2024-04-24
Résumé: BPS indices encoding entropy of supersymmetric black holes in compactifications of Type II string theory on compact Calabi-Yau threefolds coincide with generalized Donaldson-Thomas invariants whose computation represents an outstanding problem. I'll show how this problem can be solved for a set of one-parameter threefolds by combining a direct integration of topological string, modular properties of rank 0 DT invariants counting D4-D2-D0 BPS states, and wall-crossing relations between rank 1 and rank 0 DT invariants. As a result, one obtains explicit (mock) modular functions encoding infinite sets of D4-D2-D0 BPS indices, which in turn can be used to generate new boundary conditions for the holomorphic anomaly equation of topological string allowing to overcome the limitations of the direct integration method.
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