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2019

Infrared dynamics of a light scalar field in de Sitter

Mirbabayi, Mehrdad

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Inertial observers in de Sitter are surrounded by a horizon and see thermal fluctuations.

To them, a massless scalar field appears to follow a random motion but any attractive potential, no matter how weak, will eventually stabilize the field.
We study this thermalization process in the static patch (the spacetime region accessible to an individual observer) via a truncation to the low frequency spectrum.
We focus on the distribution of the field averaged over a subhorizon region.

Infrared dynamics of a light scalar field in de Sitter · Around

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A. A. Starobinsky and J. Yokoyama, “Equilibrium state of a selfinteracting scalar field in the De Sitter background,” Phys. Rev
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N. C. Tsamis and R. P. Woodard, “Stochastic quantum gravitational inflation,” Nucl. Phys
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F. Finelli, G. Marozzi, A. Starobinsky, G. Vacca, and G. Venturi, “Generation of fluctuations during inflation: Comparison of stochastic and field-theoretic approaches,” Phys. Rev. D
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F. Finelli, G. Marozzi, A. Starobinsky, G. Vacca, and G. Venturi, “Stochastic growth of quantum fluctuations during slow-roll inflation,” Phys. Rev. D
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2010
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Then

D. Marolf and I. A. Morrison, “The IR stability of de Sitter: Loop corrections to scalar propagators,” Phys. Rev
Original
2010
Later among the works it cites.
A. Higuchi, D. Marolf, and I. A. Morrison, “On the Equivalence between Euclidean and In-In Formalisms in de Sitter QFT,” Phys. Rev
Original
2011
Later among the works it cites.
V. Vennin and A. A. Starobinsky, “Correlation Functions in Stochastic Inflation,” Eur. Phys. J
Original
2015
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C. P. Burgess, R. Holman, and G. Tasinato, “Open EFTs, IR effects & late-time resummations: systematic corrections in stochastic inflation,” JHEP
Original
2016
Later among the works it cites.
H. Kitamoto, “Infrared resummation for derivative interactions in de Sitter space,” Phys. Rev. D

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M. Mirbabayi, “Loss of Memory in de Sitter” in preparation

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