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Calculating the squeezed bispectrum in stochastic inflation by Monte Carlo simulation — arXiv:2609.02076

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.02076
License (as archived): CC0-1.0
Archived: 2026-10-17T06:18:16.509Z
SHA-256 of the archived text: 314f3216175ddb98f4a9d0d61dbf83eeffe76e5bdc23657069a8c16b9c938d62
Stable URL of this page: https://metraipolis.com/documento/dc_034e7cdb444b

How to cite

Calculating the squeezed bispectrum in stochastic inflation by Monte Carlo simulation — arXiv:2609.02076 — arXiv (en), https://arxiv.org/abs/2609.02076 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_034e7cdb444b (Metraipolis archive dc_034e7cdb444b, sha256 314f3216175ddb98f4a9d0d61dbf83eeffe76e5bdc23657069a8c16b9c938d62)

BibTeX

@misc{dc034e7cdb444b,
  title = {Calculating the squeezed bispectrum in stochastic inflation by Monte Carlo simulation — arXiv:2609.02076},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.02076},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_034e7cdb444b; sha256 314f3216175ddb98f4a9d0d61dbf83eeffe76e5bdc23657069a8c16b9c938d62},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.02076. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The bispectrum of cosmological perturbations is an important probe of inflation and the underlying particle physics. However, calculating it becomes challenging in inflation models where inflaton dynamics is dominated by quantum diffusion rather than slow-roll, especially in the multi-field case. In this paper, employing the stochastic-$\delta \mathcal{N}$ formalism, we propose a Monte Carlo-based method to calculate the bispectrum in the squeezed limit, as an extension of the method for the power spectrum that we previously proposed. Our method involves generating paths of inflatons' time evolution that branch only several times, avoiding nested path generation, which incurs a prohibitive computational cost. As numerical demonstrations, we apply the proposed method to single- and double-field chaotic inflation for validation, and to hybrid inflation with mild waterfall, for which, to the best of our knowledge, the bispectrum is calculated for the first time in this work.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-03 in astro-ph.CO).
Categorie arXiv: Cosmology and Nongalactic Astrophysics (astro-ph.CO) ; General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th).
Pagina del lavoro: https://arxiv.org/abs/2609.02076 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-17T05:53:48.007Z dalla pagina https://arxiv.org/catchup/astro-ph.CO/2026-09-03?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).