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arXiv · 2610.24227

Covariant One-Loop Corrections from a Non-Covariant Expansion: The Scalar Field Case

Lucas Ducastelo de C. C. Lima·Riccardo Fecchio
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Abstract

We compute the one-loop correction to the non-minimal coupling of a scalar field theory to gravity, induced by a quartic self-interaction. We adopt the non-covariant framework of linearized gravity and explicitly compute the corresponding Feynman diagram, including both the divergent and the finite parts. The corresponding contribution to the one-loop effective action is obtained by the requirement of covariance and compared with the known results obtained by the heat kernel technique. We study the running of the non-minimal coupling, its UV and IR limit and verify the validity of the decoupling theorem in the momentum subtraction scheme of renormalization. The linearized gravity approach is also used for deriving the effective potential for the scalar field and its covariant version is stated. The agreement with results derived using strictly covariant methods is verified and highlights the versatility of the linearized gravity approach.

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Lucas Ducastelo de C. C. Lima, Riccardo Fecchio. 2026-10-16. Covariant One-Loop Corrections from a Non-Covariant Expansion: The Scalar Field Case. https://arxiv.org/abs/2610.24227

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