2012
DOI: 10.1016/j.physletb.2012.03.069
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Hubble induced mass in radiation-dominated universe

Abstract: We reconsider the effective mass of a scalar field which interact with visible sector via Planck-suppressed coupling in supergravity framework. We focus on the radiation-dominated (RD) era after inflation. In this era, the effective mass is given by thermal average of interaction terms. To make our analysis clear, we rely on Kadanoff-Baym equations to evaluate the thermal average. We find that, in RD era, a scalar field acquires the effective mass of the order of H.

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Cited by 20 publications
(29 citation statements)
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“…However, the procedure given in Ref. [10] would become complicated if we considered all the contributions to the effective mass of φ from a realistic thermal bath consisting of the SUSY SM particles. This is because the thermal expectation values of the gauge covariant kinetic terms would have to be evaluated.…”
Section: Introductionmentioning
confidence: 99%
“…However, the procedure given in Ref. [10] would become complicated if we considered all the contributions to the effective mass of φ from a realistic thermal bath consisting of the SUSY SM particles. This is because the thermal expectation values of the gauge covariant kinetic terms would have to be evaluated.…”
Section: Introductionmentioning
confidence: 99%
“…The existence of the negative Hubble-induced mass term is foreseeable due to the SUSY breaking 4 To confirm this observation, we have numerically solved the field equationS þ 3H _ S þ ∂V=∂S ¼ 0 with the potential given contributions from the thermal bath [38,39]. The phase of the coefficientc 0 of the Hubble-induced A term can change after reheating since the Kähler structures might change at that epoch, which induces a rotation of the S field in the angular direction.…”
Section: Thermal Effects On S After Inflation and Constraintsmentioning
confidence: 78%
“…One of the operators to realize the situation is O = χ χ where χ denotes a light scalar field in thermal bath and = ∂ µ ∂ µ is the d'Alembertian. By using a coupling strength g th parametrizing the interaction of χ, we can evaluate χ χ with a technique of thermal field theory as [17]…”
Section: Example: the Case Of Sudden Transition And Instant Thermalizmentioning
confidence: 99%