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000619731 005__ 20250122165508.0
000619731 0247_ $$2arXiv$$aarXiv:2412.14106
000619731 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-07866
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000619731 041__ $$aEnglish
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000619731 088__ $$2arXiv$$aarXiv:2412.14106
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000619731 1001_ $$0P:(DE-H253)PIP1015746$$aKonstandin, Thomas$$b0
000619731 245__ $$aIntrinsic non-Gaussianity of ultra slow-roll inflation
000619731 260__ $$c2024
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000619731 500__ $$a28 pages, 7 figures; v2: added references + modified figure, results unaffected
000619731 520__ $$aWe study the non-Gaussian tail of the curvature fluctuation, $\zeta$, in an inflationary scenario with a transient ultra slow-roll phase that generates a localized large enhancement of the spectrum of $\zeta$. To do so, we implement a numerical procedure that provides the probability distribution of $\zeta$ order by order in perturbation theory. The non-Gaussianities of $\zeta$ can be shown to arise from its non-linear relation to the inflaton fluctuations and from the intrinsic non-Gaussianities of the latter, which stem from its self interactions. We find that intrinsic non-Gaussianities, which have often been ignored to estimate the abundance of primordial black holes in this kind of scenario, are important. The relevance of the intrinsic contribution depends on the rapidity with which the transient ultra slow-roll phase occurs, as well as on its duration. Our method cannot be used accurately when the perturbative in-in formalism fails to apply, highlighting the relevance of developing fully non-perturbative approaches to the problem.
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000619731 7001_ $$0P:(DE-HGF)0$$aBallesteros, Guillermo$$b1
000619731 7001_ $$0P:(DE-HGF)0$$aEgea, Jesús Gambín$$b2
000619731 7001_ $$0P:(DE-HGF)0$$aRodríguez, Alejandro Pérez$$b3
000619731 7001_ $$0P:(DE-H253)PIP1098681$$aPierre, Mathias$$b4$$eCorresponding author
000619731 7001_ $$0P:(DE-H253)PIP1099356$$aRey Idler, Julian Leonardo$$b5
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000619731 9141_ $$y2024
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