Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples
| Title: | Full-Shape analysis of the power spectrum and bispectrum of DESI DR1 LRG and QSO samples |
|---|---|
| Authors: | Masot, S. Novell, Gil-Marín, H., Verde, L., Aguilar, J., Ahlen, S., Bailey, S., BenZvi, S., Bianchi, D., Brooks, D., Buckley-Geer, E., Rosell, A. Carnero, Chaussidon, E., Claybaugh, T., Cole, S., Cuceu, A., Dawson, K. S., de la Macorra, A., Demina, R., Dey, A., Dey, B., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gonzalez-Morales, A. X., Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lamman, C., Landriau, M., Guillou, L. Le, Levi, M. E., Magneville, C., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Muñoz-Gutiérrez, A., Myers, A. D., Nadathur, S., Niz, G., Noriega, H. E., Percival, W. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Ross, A. J., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Vargas-Magaña, M., Weaver, B. A., Zarrouk, P., Zhou, R., Zou, H. |
| Publication Year: | 2025 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Cosmology and Nongalactic Astrophysics |
| More Details: | We present the first joint analysis of the power spectrum and bispectrum using the Data Release 1 (DR1) of the Dark Energy Spectroscopic Instrument (DESI), focusing on Luminous Red Galaxies (LRGs) and quasars (QSOs) across a redshift range of $0.4\leq z\leq2.1$. By combining the two- and three-point statistics, we are able to partially break the degeneracy between the logarithmic growth rate, $f(z)$, and the amplitude of dark matter fluctuations, $\sigma_\textrm{s8}(z)$, which cannot be measured separately in analyses that only involve the power spectrum. In comparison with the (fiducial) Planck $\Lambda$CDM cosmology we obtain $f/f^\textrm{fid}=\{0.888_{-0.089}^{+0.186},0.977_{-0.220}^{+0.182},1.030_{-0.085}^{+0.368}\}$, $\sigma_{s8}/\sigma^\textrm{fid}_\textrm{s8}=\{1.224_{-0.133}^{+0.091},1.071_{-0.163}^{+0.278},1.000_{-0.223}^{+0.088}\}$ respectively for the three LRG redshift bins, corresponding to a cumulative 10.1\% constraint on $f$, and of 8.4\% on $\sigma_\textrm{s8}$, including the systematic error budget. The cumulative constraints for the ShapeFit compressed parameters from our joint power spectrum-bispectrum analysis are respectively $\sigma_{\alpha_\textrm{iso}}=0.9\%$ (9\% improvement with respect to our power spectrum-only analysis); $\sigma_{\alpha_\textrm{AP}}=2.3\%$ (no improvement with respect to power spectrum-only analysis, which is expected given that the bispectrum monopole has no significant anisotropic signal); $\sigma_{f\sigma_\textrm{s8}}=5.1\%$ (9\% improvement); $\sigma_{m+n}=2.3\%$ (11\% improvement). These results are fully consistent with the main DESI power spectrum analysis, demonstrating the robustness of the DESI cosmological constraints, and compatible with Planck $\Lambda$CDM cosmology. Comment: 53 pages |
| Document Type: | Working Paper |
| Access URL: | http://arxiv.org/abs/2503.09714 |
| Accession Number: | edsarx.2503.09714 |
| Database: | arXiv |
Be the first to leave a comment!