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Strong Tails in Multifield Inflation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Strong Tails in Multifield Inflation./
Author:	Panagopoulos Alexandrou, Georgios Michail.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	85 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-05, Section: B.
Contained By:	Dissertations Abstracts International83-05B.
Subject:	Quantum physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28688375
ISBN:	9798544204299

Strong Tails in Multifield Inflation.
Panagopoulos Alexandrou, Georgios Michail.

Strong Tails in Multifield Inflation. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 85 p.

Source: Dissertations Abstracts International, Volume: 83-05, Section: B.

Thesis (Ph.D.)--Stanford University, 2021.

This item must not be sold to any third party vendors.

We investigate the tail of the distribution of cosmological perturbations in multifield inflation. We show that it can be quite generally parametrically non-Gaussian by considering relative flat directions in the multifield potential landscape. The fields in these directions can develop very non-Gaussian profiles, that then mix with the inflaton, producing a heavy tail. This leads us to a new primordial black hole (PBH) production mechanism, that does not violate the current constraints from the CMB. We then study the connected N-point correlation functions of these theories and find that they have a general N!-enhancement. This N!-enhancement was previously shown to exist in quantum field theories, but only in restricted kinematics in Minkowski space, and its non-perturbative analysis is subtle. Finally, we present a new mechanism for inflation which exhibits a speed limit on scalar motion, generating accelerated expansion even on a steep potential, by explicitly integrating out the short modes of the additional fields coupled to the inflaton.

ISBN: 9798544204299Subjects--Topical Terms:

726746
Quantum physics.

Strong Tails in Multifield Inflation.
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520 $a We investigate the tail of the distribution of cosmological perturbations in multifield inflation. We show that it can be quite generally parametrically non-Gaussian by considering relative flat directions in the multifield potential landscape. The fields in these directions can develop very non-Gaussian profiles, that then mix with the inflaton, producing a heavy tail. This leads us to a new primordial black hole (PBH) production mechanism, that does not violate the current constraints from the CMB. We then study the connected N-point correlation functions of these theories and find that they have a general N!-enhancement. This N!-enhancement was previously shown to exist in quantum field theories, but only in restricted kinematics in Minkowski space, and its non-perturbative analysis is subtle. Finally, we present a new mechanism for inflation which exhibits a speed limit on scalar motion, generating accelerated expansion even on a steep potential, by explicitly integrating out the short modes of the additional fields coupled to the inflaton.
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