Exact Modeling of Power Spectrum Multipole through Spherical Fourier-Bessel Basis

Abstract

The three-dimensional galaxy power spectrum is a powerful probe of primordial non-Gaussianity and additional general relativistic effects, which become important on large scales. At the same time, wide-angle (WA) effects due to differing lines-of-sight (LOS) on the curved sky also become important with large angular separation. In this work, we accurately model WA and Doppler effects using the spherical Fourier-Bessel (SFB) formalism, before transforming the result into the commonly used power spectrum multipoles (PSM). This mapping from the SFB power spectrum to PSM represents a new way to non-perturbatively model WA and GR effects present in the PSM, which we validate with log-normal mocks. Moreover, for the first time, we can compute the analytical PSM Gaussian covariance on large scales, exactly including WA-induced mode-couplings, without resorting to any plane-parallel approximations.

9 pages, 3 figures. Added derivation of PSM covariance

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Cited by in corpus (6)

• The full-sky Spherical Fourier-Bessel power spectrum in general relativity
• Primordial non-Gaussianity -- the effects of relativistic and wide-angle corrections to the power spectrum
• Measuring our peculiar velocity from spectroscopic redshift surveys
• Separating Angular and Radial Modes with Spherical-Fourier Bessel Power Spectrum on All Scales and Implications for Systematics Mitigation
• Linear Relativistic Corrections in the Spherical Fourier-Bessel Power Spectrum
• Large-scale Modeling of the Observed Power Spectrum Multipoles