Title:	Scalar-induced gravitational waves from coherent initial states
Authors:	Mukherjee, Dipayan Ragavendra, H V Sethi, Shiv
Keywords:	Gravitational waves Inflation Quantum cosmology
Issue Date:	21-Jan-2026
Publisher:	Physical Review D
Citation:	Physical Review D, 2026, Vol. 113(2), AR No. 023533
Abstract:	We investigate the impact of statistical inhomogeneity and anisotropy in primordial scalar perturbations on the scalar-induced gravitational waves (SIGWs). Assuming inflationary quantum fluctuations originate from a coherent state, the resulting primordial scalar perturbations acquire a nonzero space-dependent mean, violating statistical homogeneity, statistical isotropy, and parity. As a consequence of statistical inhomogeneities, the SIGW acquires distinct scale-dependent features in its correlation function. Statistical anisotropies further lead to possible parity violation and correlation between different polarization modes in the tensor perturbations. Therefore, detection of these signatures in the stochastic gravitational wave background would offer probes to the statistical nature of primordial scalar perturbations beyond the scales accessible to cosmic microwave background observations.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/8670
ISSN:	2470-0029
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2026PhRvD.113b3533M/abstract https://doi.org/10.48550/arXiv.2506.23798 https://doi.org/10.1103/qd1s-9fxl
Copyright:	© 2026 American Physical Society
Appears in Collections:	Research Papers (A&A)

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