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Elliptic Genera and the Landau-Ginzburg Approach to N=2 Orbifolds
P. Di Francesco, O. Aharony, S. Yankielowicz
We compute the elliptic genera of orbifolds associated with super--conformal theories which admit a Landau-Ginzburg description. The identification of the elliptic genera of…
Graph Rings and Integrable Perturbations of Superconformal Theories
P. Di Francesco, F. Lesage, J. -B. Zuber
We show that the connection between certain integrable perturbations of superconformal theories and graphs found by Lerche and Warner extends to a broader class. These pertur…
2D Gravity and Random Matrices
P. Di Francesco, P. Ginsparg, J. Zinn-Justin
We review recent progress in 2D gravity coupled to conformal matter, based on a representation of discrete gravity in terms of random matrices. We discuss the saddle point ap…
Ramond Sector Characters and N=2 Landau-Ginzburg Models
P. Di Francesco, S. Yankielowicz
We give a direct proof of the new "product" expression for the Ramond sector characters of N=2 minimal models recently suggested by E. Witten. Our construction allows us to general…