Communications in Number Theory and Physics

Volume 2 (2008)

Number 4

Contents

Mixed Hodge structures and renormalization in physics

Spencer Bloch and Dirk Kreimer

pp. 637-718

Extremal $\CN=(2,2)$ 2D conformal field theories and constraints of modularity

Matthias R. Gaberdiel, Sergei Gukov, Christoph A. Keller, Gregory W. Moore, and Hirosi Ooguri

pp. 743-801

On the space of elliptic genera

Jan Manschot

pp. 803-833