## Abstract

Abstract According to Gibbons and Hawking a consistent variational procedure applied to the gravitational action requires a certain balance between the volume and boundary parts of the action. We consider the problem of preserving this balance in the quantum effective action for the matter non-minimally coupled to metric. It is shown that one has to add a special boundary term to the matter action analogous to the Gibbons-Hawking one. This boundary term modifies the one-loop quantum corrections to give a correct balance for the effective action as well. This means that the boundary UV divergences do not require independent renormalization and are automatically renormalized simultaneously with their volume part. This result is derived for arbitrary non-minimally coupled matter. The example of the 2D Maxwell field is considered in much detail. The relevance of the results obtained to the problem of the renormalization of the black hole entropy is discussed.

## Full Text

### Topics from this Paper

- Black Hole Entropy
- Einstein-Hilbert Action
- Non-minimally Coupled
- Boundary Term
- One-loop Quantum Corrections + Show 5 more

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