Infrared correlations in de Sitter space

• Verfasst von: Garbrecht, Björn [VerfasserIn]
• Verfasst von: Rigopoulos, Gerasimos [VerfasserIn]
• Verfasst von: Zhu, Ying [VerfasserIn]
• Titel: Infrared correlations in de Sitter space
• Titelzusatz: field theoretic versus stochastic approach
• Verf.angabe: Björn Garbrecht, Gerasimos Rigopoulos, Yi Zhu
• E-Jahr: 2014
• Jahr: 5 March 2014
• Fussnoten: Gesehen am 06.08.2020
• Titel Quelle: Enthalten in: Physical review / D
• Ort Quelle: [S.l.] : Soc., 1970
• Jahr Quelle: 2014
• Band/Heft Quelle: 89(2014,6) Artikel-Nummer 063506, 14 Seiten
• ISSN Quelle: 1550-2368
• ISSN Quelle: 1089-4918
• DOI: doi:10.1103/PhysRevD.89.063506
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1726549003

Abstract

We consider massive λϕ4 theory in de Sitter background. The mass of the scalar field ϕ is chosen small enough, such that the amplification of superhorizon momentum modes leads to a significant enhancement of infrared correlations, but large enough such that perturbation theory remains valid. Using the closed-time-path approach, we calculate the infrared corrections to the two-point function of ϕ to two-loop order. To this approximation, we find agreement with the correlation found using stochastic methods. When breaking the results down to individual Feynman diagrams obtained by the two different methods, we observe that these agree as well.