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Full bispectra from primordial scalar and tensor perturbations in the most general single-field inflation model

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arxiv 1207.0588 v2 pith:UA5JRF33 submitted 2012-07-03 astro-ph.CO gr-qchep-phhep-th

Xian Gao , Tsutomu Kobayashi , Maresuke Shiraishi , Masahide Yamaguchi , Jun'ichi Yokoyama , Shuichiro Yokoyama This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords bispectrafullinflationgeneralmodelperturbationsprimordialscalar
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We compute the full bispectra, namely both auto- and cross- bispectra, of primordial curvature and tensor perturbations in the most general single-field inflation model whose scalar and gravitational equations of motion are of second order. The formulae in the limits of k-inflation and potential-driven inflation are also given. These expressions are useful for estimating the full bispectra of temperature and polarization anisotropies of the cosmic microwave background radiation.

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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. Scalar-scalar-tensor interaction in DHOST theories

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    Derives the cubic scalar-scalar-tensor interaction action for perturbations in quadratic DHOST theories on cosmological backgrounds.

  2. Isotropic background and anisotropies of gravitational waves induced by cosmological soliton isocurvature perturbations

    astro-ph.CO 2025-01 conditional novelty 6.0 of 10

    Soliton isocurvature perturbations produce gravitational waves whose sky anisotropies are enhanced by non-Gaussianity, offering a new probe of the early universe.

  3. Primordial non-Gaussianities of scalar and tensor perturbations in general bounce cosmology: Evading the no-go theorem

    gr-qc 2019-08 conditional novelty 6.0 of 10

    In Horndeski gravity, matter bounce models can simultaneously satisfy the tensor-to-scalar ratio bound and non-Gaussianity constraints, evading a no-go theorem that applies to k-essence bounce models.

  4. Sub-Horizon Amplification of Curvature Perturbations: A New Route to Primordial Black Holes and Gravitational Waves

    astro-ph.CO 2025-04 conditional novelty 4.0 of 10

    Any negative value of the second slow-roll parameter can amplify the scalar power spectrum through sub-horizon growth, so the usual ultra-slow-roll requirement of epsilon2 <= -6 is not necessary.

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