Framing Anomaly in the Effective Theory of Fractional Quantum Hall   Effect
  We consider the geometric part of the effective action for Fractional Quantum Hall Effect (FQHE). It is shown that accounting for the framing anomaly of the quantum Chern-Simons theory is essential to the obtain correct gravitational linear response functions. In the lowest order in gradients the linear response generating functional includes Chern-Simons, Wen-Zee and gravitational Chern- Simons terms. The latter term has a contribution from the framing anomaly which fixes the value of thermal Hall conductivity and contributes to the Hall viscosity of the FQH states on a sphere. We also discuss the effects of the framing anomaly on linear responses for non-Abelian FQH states. 
Andrey Gromov, Gil Young Cho, Yizhi You, Alexander G. Abanov, and   Eduardo Fradkin
cond-mat.str-el cond-mat.mes-hall hep-th