تقرير
Exact Modeling of Power Spectrum Multipole through Spherical Fourier-Bessel Basis
| العنوان: | Exact Modeling of Power Spectrum Multipole through Spherical Fourier-Bessel Basis |
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| المؤلفون: | Wen, Robin Y., Gebhardt, Henry S. Grasshorn, Heinrich, Chen, Doré, Olivier |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | 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. Comment: 7 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2404.04812 |
| رقم الأكسشن: | edsarx.2404.04812 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |