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Large Tensor Non-Gaussianity from Axion-Gauge Fields Dynamics

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arxiv 1707.03023 v2 pith:GOFP5MIZ submitted 2017-07-10 astro-ph.CO

Aniket Agrawal , Tomohiro Fujita , Eiichiro Komatsu This is my paper · ORCID
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keywords fieldgaugebispectrumgravitationallargeomegawavesamplitude
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abstract

We show that an inflation model in which a spectator axion field is coupled to an SU(2) gauge field produces a large three-point function (bispectrum) of primordial gravitational waves, $B_{h}$, on the scales relevant to the cosmic microwave background experiments. The amplitude of the bispectrum at the equilateral configuration is characterized by $B_{h}/P_h^2=\mathcal{O}(10)\times \Omega_A^{-1}$, where $\Omega_A$ is a fraction of the energy density in the gauge field and $P_h$ is the power spectrum of gravitational waves produced by the gauge field.

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Cited by 5 Pith papers

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

  1. Kinetic Gauge Friction in Natural Inflation

    astro-ph.CO 2024-11 conditional novelty 7.0 of 10

    Kinetic gauge friction can sustain natural inflation with sub-Planckian f, and a Chern-Simons term stabilizes the perturbations, yielding CMB-compatible spectra.

  2. Gravitational Waves dynamics with Higgs portal and U(1) X SU(2) interactions

    hep-ph 2025-01 reject novelty 6.0 of 10

    A Higgs portal inflation model is shown to enhance sourced gravitational waves from an axion-SU(2) spectator to a tensor-to-scalar ratio of about 0.04, making them detectable by LiteBIRD.

  3. 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.

  4. Pure Natural Inflation Passes the ACT

    astro-ph.CO 2026-03 unverdicted novelty 4.0 of 10

    Pure natural inflation remains viable against latest ACT+DESI constraints, with a non-trivial fraction of parameter space allowed under standard reheating scenarios.

  5. CMB-S4 Science Case, Reference Design, and Project Plan

    astro-ph.IM 2019-07 unverdicted novelty 3.0 of 10

    Presents the science case, reference design, and project plan for the CMB-S4 ground-based CMB experiment.

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