% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Konstandin:619731,
      author       = {Konstandin, Thomas and Ballesteros, Guillermo and Egea,
                      Jesús Gambín and Rodríguez, Alejandro Pérez and Pierre,
                      Mathias and Rey Idler, Julian Leonardo},
      title        = {{I}ntrinsic non-{G}aussianity of ultra slow-roll inflation},
      reportid     = {PUBDB-2024-07866, DESY-24-205. arXiv:2412.14106. IFT
                      UAM-CSIC 24-183},
      year         = {2024},
      note         = {28 pages, 7 figures; v2: added references + modified
                      figure, results unaffected},
      abstract     = {We 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.},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe
                      (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2412.14106},
      howpublished = {arXiv:2412.14106},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2412.14106;\%\%$},
      doi          = {10.3204/PUBDB-2024-07866},
      url          = {https://bib-pubdb1.desy.de/record/619731},
}