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Extra-tensor-induced origin for the PTA signal: No primordial black hole production

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arxiv 2307.13109 v2 pith:LI32IIVT submitted 2023-07-24 astro-ph.CO gr-qc

Mohammad Ali Gorji , Misao Sasaki , Teruaki Suyama This is my paper · ORCID
classification astro-ph.COgr-qc
keywords signaltensorblackextrafieldissueoriginoverproduction
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Recently, pulsar timing array (PTA) collaborations announced evidence for an isotropic stochastic gravitational wave (GW) background. The origin of the PTA signal can be astrophysical or cosmological. In the latter case, the so-called secondary scalar-induced GW scenario is one of the viable explanations, but it has a potentially serious issue of the overproduction of primordial black holes (PBHs) due to the enhanced curvature perturbation. In this letter, we present a new interpretation of the PTA signal. Namely, it is originated from an extra spectator tensor field that exists on top of the metric tensor perturbation. As the energy density of the extra tensor field is always subdominant, it cannot lead to the formation of PBHs. Thus our primordial-tensor-induced scenario is free from the PBH overproduction issue.

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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. Purely quadratic non-Gaussianity from tachyonic instability: Primordial black holes and scalar-induced gravitational waves

    astro-ph.CO 2026-04 unverdicted novelty 5.0 of 10

    Purely quadratic non-Gaussianity from tachyonic instability allows narrow curvature spectra to exponentially suppress primordial black hole overproduction via correlation coefficient ρ approaching -1 while retaining s...

  2. 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.

  3. Tensor induced gravitational waves

    astro-ph.CO 2025-07 conditional novelty 4.0 of 10

    Second-order tensor-induced gravitational waves can shift the inferred parameters of small-scale primordial gravitational wave models fitted to NANOGrav 15-year data, with one model favored by Bayes factors.

  4. Cosmological constraints on small-scale primordial non-Gaussianity

    astro-ph.CO 2025-05 conditional novelty 4.0 of 10

    Current pulsar-timing, CMB, BAO and PBH data constrain the small-scale local f_NL to -10.0 < f_NL < 1.2 for a monochromatic primordial power spectrum, with that constraint conditional on the spectral amplitude A_zeta = 10^-2.

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