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Kamada, Ayuki
순수물리이론 연구단
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Lessons from T-mu(mu) on inflation models: Two-scalar theory and Yukawa theory

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Title
Lessons from T-mu(mu) on inflation models: Two-scalar theory and Yukawa theory
Author(s)
Ayuki Kamada; Takumi Kuwahara
Subject
ENERGY-MOMENTUM-TENSOR, ; DIMENSIONAL RENORMALIZATION, ; TRACE ANOMALIES, ; SCALAR, ; GRAVITY, ; REGULARIZATION, ; COSMOLOGY
Publication Date
2020-05
Journal
PHYSICAL REVIEW D, v.101, no.9, pp.096012-1
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 authors. Published by the American Physical Society. We demonstrate two properties of the trace of the energy-momentum tensor T-mu(mu) in the flat spacetime. One is the decoupling of heavy degrees of freedom; i.e., heavy degrees of freedom leave no effect for low-energy T-mu(mu)-inserted amplitudes. This is intuitively apparent from the effective field theory point of view, but one has to take into account the so-called trace anomaly to explicitly demonstrate the decoupling. As a result, for example, in the R-2 inflation model, scalaron decay is insensitive to heavy degrees of freedom when a matter sector minimally couples to gravity (up to a nonminimal coupling of a matter scalar field other than the scalaron). The other property is a quantum contribution to a nonminimal coupling of a scalar field. The nonminimal coupling disappears from the action in the flat spacetime, but leaves the so-called improvement term in T-mu(mu). We study the renormalization group equation of the nonminimal coupling to discuss its quantum-induced value and implications for inflation dynamics. We work it out in the two-scalar theory and Yukawa theory
URI
https://pr.ibs.re.kr/handle/8788114/7857
DOI
10.1103/PhysRevD.101.096012
ISSN
2470-0010
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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