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Light Particles with Spin in Inflation

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arxiv 1806.10587 v2 pith:56L5WSPJ submitted 2018-06-27 hep-th astro-ph.COgr-qc

Lorenzo Bordin , Paolo Creminelli , Andrei Khmelnitsky , Leonardo Senatore This is my paper
classification hep-thastro-ph.COgr-qc
keywords lightspininflationparticlesstatesinflatonsizeabletensor
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The existence of light particles with spin during inflation is prohibited by the Higuchi bound. This conclusion can be evaded if one considers states with a sizeable coupling with the inflaton foliation, since this breaks the de Sitter isometries. The action for these states can be constructed within the Effective Field Theory of Inflation, or using a CCWZ procedure. Light particles with spin have prescribed couplings with soft inflaton perturbations, which are encoded in consistency relations. We study the phenomenology of light states with spin 2. These mix with the graviton changing the tensor power spectrum and can lead to sizeable tensor non-Gaussianities. They also give rise to a scalar bispectrum and trispectrum with a characteristic angle-dependent non-Gaussianity.

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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. New exact bispectrum shapes in multifield inflation

    hep-th 2026-07 conditional novelty 8.0 of 10

    Exact analytic bispectrum shapes are derived for multifield inflation at arbitrary quadratic mixing strength, showing a strong-mixing collider signal with frequency μ_eff = sqrt(m²/H² + λ² − 9/4).

  2. Dissecting the Scalar Cosmological Collider with the Cosmic Microwave Background

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

    A joint Bayesian fit of the multi-field inflationary Lagrangian to Planck bispectrum data finds no cosmological collider signal (max Δχ²=5.3) and shows weak-mixing template searches are invalid except at the smallest masses.

  3. First Search for Kaluza-Klein Gravitons and Radion Using Planck Data

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

    First Planck search for radion and KK-graviton bispectra finds no significant non-Gaussianity (max 1.8σ at m_KK ≈ 1.6H), while a warped 5D model can yield f_NL ~ 1–50.

  4. The Exact and Approximate Tales of Boost-Breaking Cosmological Correlators

    hep-th 2025-06 conditional novelty 7.0 of 10

    The tree-level boost-breaking cosmological collider seed correlator is computed exactly for general sound speed and chemical potential, and saddle-point methods turn it into practical elementary-function templates.

  5. On Cosmological Correlators with Boundary Contributions

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    The paper derives a correspondence between boundary terms and field redefinitions for cosmological correlators and classifies non-vanishing boundary contributions in massive-exchange diagrams under dS isometries and b...

  6. Oscillations and parity violation in gravitational wave background from extra tensor modes

    astro-ph.CO 2025-08 conditional novelty 5.0 of 10

    Linear mixing between metric and extra spin-2 tensor modes during inflation produces oscillatory and chiral gravitational wave backgrounds with features that future detectors could identify.

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