Effective Action from the Functional Renormalization Group

Understand

We study the quantum gravitational system coupled to a charged scalar, Dirac fermions, and electromagnetic fields.

• We use the "exact" or "functional" renormalization group equation to derive the effective action $\Gamma_0$ by integrating the flow equation from the ultraviolet scale down to $k=0$.
• The resulting effective action consists of local terms and nonlocal terms with unique coefficients.