Mélanie Langlois,1 Pierre-Olivier Polack,3 Hélène Bernard,1 Olivier David,2 Stéphane Charpier,3 Antoine Depaulis,1 and Colin Deransart1 1Equipe 9, Dynamique des Réseaux Synchrones Epileptiques, and 2Equipe 5, Neuroimagerie Fonctionnelle et Métabolique, Grenoble Institut des Neurosciences, Institut National de la Santé et de la Recherche Médicale U 836-Université Joseph Fourier-Commisariat à l’E...

It is well-known that Scherk-Schwarz compactifications in string theory have a tachyon in the closed string spectrum appearing for a critical value of a compact radius. The tachyon can be removed by an appropriate orientifold projection in type II strings, giving rise to tachyon-free compactifications. We present explicit examples of this type in various dimensions, including six and four-dimen...

We present a first estimate of the cross-section for the exclusive process γ L(Q 2 1)γ ∗ L(Q 2 2) → ρLρL, which will be studied in the future high energy e+e−− linear collider. As a first step, we calculate the Born order approximation of the amplitude for longitudinally polarized virtual photons and mesons, in the kinematical region s ≫ −t, Q1 , Q2. This process is completely calculable in the...

We revisit the holomorphic anomaly equations satisfied by the topological string amplitude from the perspective of the 4D-5D lift, in the context of “magic” N = 2 supergravity theories. In particular, we interpret the Gopakumar-Vafa relation between 5D black hole degeneracies and the topological string amplitude as the result of a canonical transformation from 4D to 5D charges. Moreover we use ...

We point out at the peculiarity of B → μνμ decay, namely the enhancement of the soft photon events which originate from the structure dependent part of the B → μνμγ amplitude. This may be a dominant source of systematic uncertainty and compromise the projected experimental uncertainty on Γ(B → μνμ). We show that the effect of these soft photons can be controlled if the experimental cut on ident...

In the framework of orbifold compactifications of heterotic and type II orientifolds, we study effective N = 1 supergravity potentials arising from fluxes and gaugino condensates. These string solutions display a broad phenomenology which we analyze using the method of N = 4 supergravity gaugings. We give examples in type II and heterotic compactifications of combined fluxes and condensates lea...

We propose, within a perturbative string theory example, a cosmological way to generate a large hierarchy between the observed Planck mass and the fundamental string scale. Time evolution results in three large space dimensions, one additional dimension transverse to our world and five small internal dimensions with a very slow time evolution. The evolution of the string coupling and internal s...

NMSPEC is a Fortran code that computes the sparticle and Higgs masses, as well as Higgs decay widths and couplings in the NMSSM, with soft susy breaking terms specified atMGUT. Exceptions are the soft singlet massm 2 s and the singlet self coupling κ, that are both determined in terms of the other parameters through the minimization equations of the Higgs potential. We present a first analysis ...

Résumé. Dans cet article, nous présentons une méthode mixte de segmentation d'objets visuels dans une séquence d'images d'une vidéo combinant à la fois une segmentation basée régions et l'estimation de mouvement par flot optique. L'approche développée est basé sur une minimisation d'une fonctionnelle d'énergie (E) qui fait intervenir les probabilités d'appartenance (densité) avec une gaussienne...

Stationary solutions of 5D supergravity with U(1) isometry can be efficiently studied by dimensional reduction to three dimensions, where they reduce to solutions to a locally supersymmetric non-linear sigma model. We generalize this procedure to 5D gauged supergravity, and identify the corresponding gauging in 3D. We pay particular attention to the case where the Killing spinor is non constant...