Zobrazeno 1 - 10 of 16 pro vyhledávání: '"Olivier Brahic"'
1
L∞-actions of Lie algebroids
Autor: Olivier Brahic, Marco Zambon
Publikováno v: Communications in Contemporary Mathematics. 24
We consider homotopy actions of a Lie algebroid on a graded manifold, defined as suitable [Formula: see text]-algebra morphisms. On the “semi-direct product” we construct a homological vector field that projects to the Lie algebroid. Our main the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e76e670d07941eb267bf4aa46c4870f2
https://doi.org/10.1142/s0219199721500139
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3
Lie groupoids and their natural transformations
Autor: Olivier Brahic, Dion Pasievitch
Publikováno v: Differential Geometry and its Applications. 71:101626
We discuss natural transformations in the context of Lie groupoids, and their infinitesimal counterpart. Our main result is an integration procedure that provides smooth natural transformations between Lie groupoid morphisms.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8abd9a1785949d110d2b2cfa78a6889
https://doi.org/10.1016/j.difgeo.2020.101626
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4
French ministry of health's response to paris attacks of 13 november 2015
Autor: Jean-Marc Philippe, Jean-Pierre Tourtier, Olivier Brahic, Pierre Carli, Bruno Riou, Benoit Vallet
Publikováno v: Critical Care
Critical Care, BioMed Central, 2016, 20, ⟨10.1186/s13054-016-1259-8⟩
Critical Care, 2016, 20, ⟨10.1186/s13054-016-1259-8⟩
International audience; On Friday November 13th at 9:20 pm, three kamikaze bombs went off around the Stade de France a stadium in Saint-Denis just outside Paris, 4 different shootings took place and bombings in Paris and hundreds of people were held
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7184cdc20c4c2d386eafca8160f4ee60
https://hal.univ-lille.fr/hal-02530726/document
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5
Infinitesimal gauge symmetries of closed forms
Autor: Olivier Brahic
Publikováno v: Journal of Geometric Mechanics. 3:277-312
Motivated by the relationship between symplectic fibrations and classical Yang-Mills theories, we study the closedness of a $n$-form ($n$=2,3) defined on the total space of a fibration as a simple model for an abstract field theory. We introduce $2$-
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a38f1c862c92954d40adea4a011711b5
https://doi.org/10.3934/jgm.2011.3.277
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6
Integration of Coupling Dirac Structures
Autor: Olivier Brahic, Rui Loja Fernandes
Coupling Dirac structures are Dirac structures defined on the total space of a fibration, generalizing hamiltonian fibrations from symplectic geometry, where one replaces the symplectic structure on the fibers by a Poisson structure. We study the ass
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe796831d6b2b4e04de541ae14962f56
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7
Extensions of Lie Brackets
Autor: Olivier Brahic
We provide a framework for extensions of Lie algebroids, including non-abelian extensions and Lie algebroids over different bases. Our approach involves Ehresmann connections, which allows straight generalizations of classical constructions. We exhib
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8
Poisson Fibrations and Fibered Symplectic Groupoids
Autor: Olivier Brahic, Rui Loja Fernandes
We show that Poisson fibrations integrate to a special kind of symplectic fibrations, called fibered symplectic groupoids.
Comment: 18 pages. Proceedings of the Poisson 2006 conference in Tokyo to be published in the AMS Contemporary Mathematics
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9
Dissertation/ Thesis
Invariants semi-locaux des Structures de Poisson
Autor: Olivier, Brahic
La donnée d'une structure de Poisson sur une variété induit un feuilletage dont les feuilles sont des variétés symplectiques. En chaque point de la variété, il existe un unique invariant local, donné par la structure transverse. Dans ce trava
Externí odkaz: http://tel.archives-ouvertes.fr/tel-00575486
http://tel.archives-ouvertes.fr/docs/00/57/54/86/PDF/total.pdf
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10
Hessian Riemannian gradient flows in convex programming *
Autor: Felipe Alvarez, Jérôme Bolte, Olivier Brahic
Publikováno v: SIAM Journal on Control and Optimization
SIAM Journal on Control and Optimization, Society for Industrial and Applied Mathematics, 2004, 43 (2), pp.477-501. ⟨10.1137/S0363012902419977⟩
SIAM JOURNAL ON CONTROL AND OPTIMIZATION
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International audience; Motivated by a constrained minimization problem, it is studied the gradient flows with respect to Hessian Riemannian metrics induced by convex functions of Legendre type. The first result characterizes Hessian Riemannian struc
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60fe334690536af004eb7c7d9647c5eb
https://hal.archives-ouvertes.fr/hal-01928141
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