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Conditions for large non-Gaussianity in two-field slow-roll inflation

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arxiv 0807.1101 v2 pith:DF6WXI7L submitted 2008-07-07 astro-ph gr-qchep-th

Christian T. Byrnes , Ki-Young Choi , Lisa M.H. Hall This is my paper · ORCID
classification astro-phgr-qchep-th
keywords non-gaussianityinflationslow-rollconditionslargelevelobtaintwo-field
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We study the level of primordial non-Gaussianity in slow-roll two-field inflation. Using an analytic formula for the nonlinear parameter f_nl in the case of a sum or product separable potential, we find that it is possible to generate significant non-Gaussianity even during slow-roll inflation with Gaussian perturbations at Hubble exit. In this paper we give the general conditions to obtain large non-Gaussianity and calculate the level of fine-tuning required to obtain this. We present explicit models in which the non-Gaussianity at the end of inflation can exceed the current observational bound of |f_nl|<100.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Pushing the Primordial Frontier: Exact Linear Solutions in Multifield Inflation

    astro-ph.CO 2026-06 unverdicted novelty 8.0 of 10

    Exact analytic solutions for coupled linear perturbations in two-field inflation provide a closed-form primordial power spectrum that interpolates weak, strong, light, and heavy field regimes.

  2. Pushing the Primordial Frontier: Cosmological Collider Signatures at Strong Mixing

    astro-ph.CO 2026-07 conditional novelty 7.0 of 10

    Exact analytic squeezed-limit bispectra for strongly mixed two-field inflation, nonperturbative in the curvature-isocurvature mixing λ.

  3. Cosmological gravitational particle production in multifield inflation

    hep-ph 2026-06 unverdicted novelty 6.0 of 10

    Negative field-space curvature enhances post-inflationary Ricci scalar oscillations and boosts CGPP dark matter number density by up to an order of magnitude relative to flat field-space cases, with nontrivial relic a...

  4. Origin of ultra-light fields during inflation and their suppressed non-Gaussianity

    hep-th 2019-08 conditional novelty 6.0 of 10

    A scaling symmetry in a class of two-field inflation models naturally produces a massless isocurvature field whose self-interactions are suppressed, making primordial non-Gaussianity slow-roll suppressed but with a sq...

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