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Production scientifique
(394) Production(s) de l'année 2014
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Twistor approach to string compactifications, NS5-branes and integrability
Auteur(s): Alexandrov S.
(Séminaires)
Perimeter Institute (Waterloo, CA), 2014-05-12
Résumé: I'll review the progress achieved in constructing the
non-perturbative hypermultiplet moduli space using twistorial
methods. The metric on this space determines the low-energy
effective action of Type II string theory compactified on a
Calabi-Yau threefold. It receives instanton corrections due to
D-branes and NS5-branes and I'll show how all of them can be
nicely incorporated at the level of the twistor space. I'll argue
that the inclusion of NS5-brane instantons might be closely
related to quantization of a certain integrable structure. If the
time permits, I'll present also a conjecture for the Witten index
of 4d N=2 gauge theories inspired by the twistorial description of
the hypermultiplet moduli space.
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First order gravity on the light front
Auteur(s): Alexandrov S.
(Séminaires)
APC (Paris, FR), 2014-05-06
Résumé: After a brief review of unusual features of the light front canonical
formulations of field theories, I'll present the analysis
of the canonical structure of the first order formulation
of general relativity on a lightlike foliation.
It appears to be quite different from the usual spacelike case
leading, for instance, to the presence of tertiary constraints.
Besides, I'll discuss the issue of the zero modes and argue that
there might be some hidden correspondence with two-dimensional theories.
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Non-equilibrium quantum manipulation 
Auteur(s): Antezza M.
Conférence invité: XXIII International Materials Research Congress, “Symposium Materials Relevance in Fluctuation-I (Cancun, MX, 2014-08-18)
Ref HAL: hal-01909555_v1
Exporter : BibTex | endNote
Résumé: We will discuss the behavior of an elementary quantum system (atom, quantum dot, …) interacting with an environment out of thermal equilibrium. We show how the internal atomic dynamics can be deeply affected by the non equilibrium configuration leading to unexpected phenomena like a spontaneous inversion of population, new cooling mechanisms obtained by heating the system, and the possibility to create and protect entanglement in a stationary and robust way [1,2,3].----------------References: [1] B. Bellomo, R. Messina, and M. Antezza, Europhys. Lett. 100, 20006 (2012); Phys. Rev. A 87, 012101 (2013).[2] B. Bellomo and M. Antezza, New Journal of Physics 15, 113052 (2013); Europhys. Lett. 104, 10006 (2013).[3] R. Messina and M. Antezza, Europhys. Lett. 95, 61002 (2011); Phys. Rev. A 84, 042102 (2011); Phys. Rev. A in press, arXiv:1402.2506 (2014).
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Light-Matter interaction: from elementary quantum systems out of thermal equilibrium to atomic artificial crystals
Auteur(s): Antezza M.
(Séminaires)
University of Trento (Trento, IT), 2014-02-27
Commentaires: Lectio Magistralis for the PhD Academic Year opening
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Non-equilibrium quantum manipulation: from quantum thermal machines to quantum transport
Auteur(s): Antezza M.
(Séminaires)
ICFO (Barcelona, ES), 2014-10-21 |
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Non-equilibrium quantum manipulation: from quantum thermal machines to quantum transport
Auteur(s): Antezza M.
(Séminaires)
Universidad Autonoma de Madrid, Physics department (Madrid, ES), 2014-11-24
Commentaires: Condensed Matter Colloquium, Universidad Autonoma de Madrid
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