Work

Derivative expansion in a two-scalar field theory

Year: 2025

Type: article

Abstract: The derivative expansion of the effective action is considered in the model with two interacting real scalar fields in curved spacetime. Using the functional approach and local momentum representation, the coefficient of the derivative term is calculated up to the first order in curvature in the one-scalar theory. The two-scalar problem is solved by extracting normal modes and consequent reduction to the single-scalar case. The method can be applied to a larger number of scalars. In the theory with strong hierarchy of masses, the renormalized effective potential and the coefficients of the second-order derivative terms demonstrate the quantum decoupling in the low-energy limit.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/rynr-2znv

Authors: Alícia G. Borges, Ilya L. Shapiro

Institution: Universidade Federal de Juiz de Fora

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: Conselho Nacional de Desenvolvimento Científico e Tecnológico, Universidade Federal de Juiz de Fora

Award: G1248124938