Abstract
We consider, in more details than it was done previously, the effective low- energy behavior in the quantum theory of a light scalar field coupled to another scalar with much larger mass. The main target of our work is an IR decoupling of heavy degrees of freedom, including in the diagrams with mixed light-heavy contents in the loops. It is shown that the one-loop diagrams with mixed internal lines produce an IR non-local contributions which are exactly the same as the ones in the theory of the light scalar alone, with the effective self-interaction which can be obtained by the functional integration of the heavy scalar, almost neglecting its kinetic term. The same effect takes place in curved space, regardless of a larger amount of non-localities which show up in the effective model.
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Ribeiro, T.G., Shapiro, I.L. Scalar model of effective field theory in curved space. J. High Energ. Phys. 2019, 163 (2019). https://doi.org/10.1007/JHEP10(2019)163
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DOI: https://doi.org/10.1007/JHEP10(2019)163