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20 papers · 2 filters
Rolling among G_2 vacua
H. Partouche, B. Pioline
We consider topology-changing transitions between 7-manifolds of holonomy G_2 constructed as a quotient of CY x S^1 by an antiholomorphic involution. We classify involutions for Co…
Contact interactions in D-brane models
I. Antoniadis, K. Benakli, A. Laugier
We compute the tree-level four-point scattering amplitudes in string models where matter fields live on D-brane intersections. Extracting the contribution of massless modes, we are…
Anti-de-Sitter D-branes
C. Bachas, M. Petropoulos
We study D-branes of the ${SL(2,\bR)}$ WZW model, and of its discrete orbifolds. Gluing the currents by group automorphisms leads to three types of D-branes: two-dimensional hyperb…
Left-Right Symmetric Models in Noncommutative Geometries?
Florian Girelli
Left-right symmetric models are analyzed in the context of noncommutative geometry where we show that spontaneous parity violation is ruled out.
BRS-Chern-Simons forms and cyclic homology
Denis Perrot
We use some BRS techniques to construct Chern-Simons forms generalizing the Chern character of K_1 groups in the Cuntz-Quillen description of cyclic homology.
The geometry of W3 algebra: a twofold way for the rebirth of a symmetry
G. Bandelloni, S. Lazzarini
The purpose of this note is to show that W3 algebras originate from an unusual interplay between the breakings of the reparametrization invariance under the diffemorphism action on…