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Non-Gaussianity and the induced gravitational wave background
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Scalar metric fluctuations generically source a spectrum of gravitational waves at second order in perturbation theory, poising gravitational wave experiments as potentially powerful probes of the small-scale curvature power spectrum. We perform a detailed study of the imprint of primordial non-Gaussianity on these induced gravitational waves, emphasizing the role of both the disconnected and connected components of the primoridal trispectrum. Specializing to local-type non-Gaussianity, we numerically compute all contributions and present results for a variety of enhanced primordial curvature power spectra.
Forward citations
Cited by 8 Pith papers
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A non-perturbative framework for N-point functions of locally non-Gaussian fields
N-point functions of locally non-Gaussian fields can be expanded in powers of the Gaussian correlation function using the Kibble-Slepian decomposition, with coefficients from one-point integrals; for an exponential-ta...
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Twisted echoes of an odd quartet: Scalar-induced gravitational waves as a probe of primordial parity-violation
A parity-odd primordial trispectrum imprints measurable left-right asymmetry in scalar-induced gravitational waves, and the chirality ratio directly tracks the parity-odd to parity-even trispectrum amplitude ratio.
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Imprints of Large-Scale Structures in the Anisotropies of the Cosmological Gravitational Wave Background
The cosmological gravitational wave background is predicted to cross-correlate with galaxy positions through the late integrated Sachs-Wolfe effect, giving a source-discrimination handle and a forecast improvement of ...
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Scalar-induced gravitational waves from a box-shaped curvature power spectrum
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Constraining primordial non-Gaussianity and parity-violation through Scalar-Induced Gravitational Waves with next-generation ground-based interferometers
ET+CE forecast: injected SIGW parameters (A_p, f_peak, f_NL, tau_NL, parity-odd tau_tilde_NL) are recovered within 1-2 sigma despite an astrophysical foreground, but the chiral V-mode is sub-threshold (SNR 0.5-1.9).
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Implications for Pulsar Timing Arrays of Sub-solar Black Hole Detections: From LVK to Einstein Telescope and Cosmic Explorer
A Bayesian analysis shows that a future sub-solar PBH detection would make the primordial SIGW interpretation of PTA data favored over the SMBH interpretation, but this preference is driven by the detection prior.
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Gravitational Waves from Spectator Scalar Fields
Heavy spectator scalar fields with masses near the inflationary Hubble scale generate a gravitational wave background observable across pulsar timing arrays, LISA, and ground-based interferometers, with constraints re...
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Cosmological constraints on small-scale primordial non-Gaussianity
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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