Tensor-induced second-order density perturbations follow a chi-squared distribution whose bispectrum shape depends on the primordial GW power spectrum, producing strong equilateral signals for Gaussian-bump and monochromatic sources.
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Non-Gaussianity of Tensor Induced Density Perturbations
Tensor-induced second-order density perturbations follow a chi-squared distribution whose bispectrum shape depends on the primordial GW power spectrum, producing strong equilateral signals for Gaussian-bump and monochromatic sources.