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Strongly Coupled Quasi-Single Field Inflation

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arxiv 1710.03054 v2 pith:4KJ6UBMN submitted 2017-10-09 hep-th astro-ph.COgr-qc

Aditya Varna Iyer , Shi Pi , Yi Wang , Ziwei Wang , Siyi Zhou This is my paper · ORCID
classification hep-thastro-ph.COgr-qc
keywords fieldcontributioneffectivelocalmassmassivenon-localpower
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We study the power spectrum of quasi-single field inflation where strong coupling is considered. The contribution from the massive propagator can be divided into local and non-local contributions. The local one is the leading contribution and is power-law suppressed as a function of mass, while the non-local contribution is exponentially suppressed in the large mass limit. For the local contribution, it is possible to use the effective field theory approach to study the power spectrum in the strongly coupled region of the parameter space. For the non-local contribution, we developed a partial effective field theory method to simplify the calculation: When there are multiple massive propagators, one can fully compute it after integrating out all but one massive propagator by effective field theory. The result retains the "standard clock" signal, which is interesting for probing the expansion history of the primordial universe and the physics of a "cosmological collider". The error involved compared to the full calculation is power law suppressed by the effective mass of the heavy field.

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Cited by 6 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. Massive Inflationary Amplitudes: Differential Equations and Complete Solutions for General Trees

    hep-th 2024-12 conditional novelty 7.0 of 10

    Every tree-level massive inflation correlator in the signal region can be written as one massive family tree series plus its cuts, with 2I summation variables.

  4. Cosmological Collider Signals at Strong Mixing

    hep-th 2026-07 conditional novelty 6.0 of 10

    The squeezed-limit cosmological collider signal is computed nonperturbatively in the mixing strength as an absolutely convergent series, with a JWKB expansion of the oscillation phase.

  5. Cosmological Correlators at the Loop Level

    hep-th 2024-11 conditional novelty 6.0 of 10

    Using the partial Mellin-Barnes method, the author derives analytic signals from one-loop bubble diagrams in inflation correlators, including the first analytic results for a de Sitter boost-breaking bubble.

  6. Canonical Scalar Field Inflation with a Woods-Saxon Potential

    gr-qc 2019-08 reject novelty 3.0 of 10

    A Woods-Saxon (logistic) scalar potential is claimed to produce Planck-compatible inflation and reheating, but the supporting slow-roll equations contain sign and algebra errors.

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