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astro-ph.CO2026
Analytic bispectrum covariance for galaxy survey cosmology
Utkarsh Giri, Henry S. Grasshorn Gebhardt, Olivier Dore
The bispectrum of galaxy distribution remains an underutilized statistic in cosmological data analysis. This can be attributed to mathematical and computational challenges associat…
astro-ph.CO2026
If at First You Don't Succeed, Trispectrum: I. Estimating the Matter Power Spectrum Covariance with Higher-Order Statistics
Samuel Goldstein, Kendrick M. Smith, Utkarsh Giri +1
We present a method to estimate non-Gaussian power spectrum covariance matrices by directly measuring the response of the small-scale power spectrum to long-wavelength perturbation…