Cohomological beta function: the leading perturbative beta function in 2D CFT current-current deformations equals the coefficient of the cocycle obstructing Virasoro module deformation on the state space.
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Cohomological beta function
Cohomological beta function: the leading perturbative beta function in 2D CFT current-current deformations equals the coefficient of the cocycle obstructing Virasoro module deformation on the state space.