The hand-made tail: Non-perturbative tails from multifield inflation
EntityUAM. Departamento de Física Teórica
10.1007/JHEP05(2022)052Journal of High Energy Physics (JHEP) 2022.5 (2022): 52
ISSN1126-6708 (print); 1029-8479 (online)
Funded byThe work of SC has been funded by a Contrato de Atracción de Talento (Modalidad 1) de la Comunidad de Madrid (Spain), number 2017- T1/TIC-5520 and the IFT Centro de Excelencia Severo Ochoa Grant SEV-2016-0597. ACD acknowledges partial support from STFC consolidated grant ST/T000694/1. AA’s work is partially supported by the Netherlands Organization for Scientific Research (N.W.O), by the Basque Government (IT-979-16) and by the Spanish Ministry MINECO (FPA2015- 64041-C2-1P)
ProjectGobierno de España. SEV-2016-0597
SubjectsInflation; Supergravity; Cosmos; Física
Rights© 2022, The Author(s)
Esta obra está bajo una Licencia Creative Commons Atribución 4.0 Internacional.
It is becoming increasingly clear that large but rare fluctuations of the primordial curvature field, controlled by the tail of its probability distribution, could have dramatic effects on the current structure of the universe — e.g. via primordial black-holes. However, the use of standard perturbation theory to study the evolution of fluctuations during inflation fails in providing a reliable description of how non-linear interactions induce non-Gaussian tails. Here, we use the stochastic inflation formalism to study the non-perturbative effects from multi-field fluctuations on the statistical properties of the primordial curvature field. Starting from the effective action describing multi-field fluctuations, we compute the joint probability density function and show that enhanced non-Gaussian tails are a generic feature of slow-roll inflation with additional degrees of freedom
Google Scholar:Achúcarro, Ana - Cespedés Castillo, Sebastián Miguel - Davis, Anne-Christine - Palma, Gonzalo A.
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