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2026
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| Online-Zugang: | https://arxiv.org/abs/2603.25693 |
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| author | Wang, Yuting Zhao, Gong-Bo Koyama, Kazuya Zhao, Ruiyang Nishimichi, Takahiro Zhai, Zhongxu Gil-Marín, Héctor Zhang, Hanyu Aguilar, Jessica Nicole Ahlen, Steven Beutler, Florian Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel de Mattia, Arnaud Dey, Biprateep Doel, Peter Eisenstein, Daniel J. Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gu, Gan Gutierrez, Gaston Hahn, ChangHoon Honscheid, Klaus Howlett, Cullan Joyce, Dick Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Kneib, Jean-Paul Kremin, Anthony Lamman, Claire Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Roman Nadathur, Seshadri Newman, Jeffrey A. Paillas, Enrique Percival, Will J. Prada, Francisco Pérez-Ràfols, Ignasi Rosado-Marín, Alberto J. Ross, Ashley J. Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlafly, Edward F. Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Wang, Xiaoma Weaver, Benjamin Alan Yuan, Shuo |
| author_facet | Wang, Yuting Zhao, Gong-Bo Koyama, Kazuya Zhao, Ruiyang Nishimichi, Takahiro Zhai, Zhongxu Gil-Marín, Héctor Zhang, Hanyu Aguilar, Jessica Nicole Ahlen, Steven Beutler, Florian Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel de Mattia, Arnaud Dey, Biprateep Doel, Peter Eisenstein, Daniel J. Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gu, Gan Gutierrez, Gaston Hahn, ChangHoon Honscheid, Klaus Howlett, Cullan Joyce, Dick Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Kneib, Jean-Paul Kremin, Anthony Lamman, Claire Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Roman Nadathur, Seshadri Newman, Jeffrey A. Paillas, Enrique Percival, Will J. Prada, Francisco Pérez-Ràfols, Ignasi Rosado-Marín, Alberto J. Ross, Ashley J. Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlafly, Edward F. Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Wang, Xiaoma Weaver, Benjamin Alan Yuan, Shuo |
| contents | We present joint measurements of the pre- and post-reconstruction power spectra, $P_{\rm pre}$ and $P_{\rm post}$, together with their cross-power spectrum, $P_{\rm cross}$, for the Luminous Red Galaxies (LRGs) in the DESI Data Release 1 (DR1). We jointly analyse these observables with an emulator-based full-shape modeling framework, thereby, for the first time, we extract complementary nonlinear information from the galaxy density field before and after reconstruction in real survey data. Specifically, including $P_{\rm post}$ and $P_{\rm cross}$ in addition to $P_{\rm pre}$ (hereafter $P_{\rm all}$) yields an improvement of approximately $18$-$27\%$ in the $σ_8$ constraint in both $Λ$CDM and $w$CDM, depending on the redshift bin, relative to the $P_{\rm pre}$-only analysis with the cosmic microwave background distance priors (hereafter CMB). In $w$CDM, the joint CMB+$P_{\rm all}$ analysis can tighten the constraints on $w$ by approximately $5$-$15\%$ across the two LRG redshift bins, compared to the CMB+$P_{\rm pre}$ combination. Further incorporating the Type Ia supernova dataset and comparing the cosmological constraints in $w$CDM from each individual power-spectrum component with those from the full combination, we find that $P_{\rm all}$ consistently provides the tightest constraints. From the joint CMB+$P_{\rm all}$+DES-Dovekie dataset, we obtain $Ω_m = 0.314 \pm 0.0048$ and $w = -0.988 \pm 0.023$ for the \texttt{LRG1} sample, and $Ω_m = 0.318 \pm 0.0046$ and $w = -0.988 \pm 0.025$ for \texttt{LRG2}. These results demonstrate that combining pre- and post-reconstruction power spectra with their cross-correlation enables DESI to harvest additional nonlinear information, leading to tighter constraints on cosmological parameters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_25693 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nonlinear Information from DESI Luminous Red Galaxies: An Emulator-Based Analysis of Pre- and Post-Reconstruction Power Spectra Wang, Yuting Zhao, Gong-Bo Koyama, Kazuya Zhao, Ruiyang Nishimichi, Takahiro Zhai, Zhongxu Gil-Marín, Héctor Zhang, Hanyu Aguilar, Jessica Nicole Ahlen, Steven Beutler, Florian Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cuceu, Andrei de la Macorra, Axel de Mattia, Arnaud Dey, Biprateep Doel, Peter Eisenstein, Daniel J. Ferraro, Simone Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gu, Gan Gutierrez, Gaston Hahn, ChangHoon Honscheid, Klaus Howlett, Cullan Joyce, Dick Juneau, Stephanie Kehoe, Robert Kirkby, David Kisner, Theodore Kneib, Jean-Paul Kremin, Anthony Lamman, Claire Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Roman Nadathur, Seshadri Newman, Jeffrey A. Paillas, Enrique Percival, Will J. Prada, Francisco Pérez-Ràfols, Ignasi Rosado-Marín, Alberto J. Ross, Ashley J. Rossi, Graziano Samushia, Lado Sanchez, Eusebio Schlafly, Edward F. Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Wang, Xiaoma Weaver, Benjamin Alan Yuan, Shuo Cosmology and Nongalactic Astrophysics We present joint measurements of the pre- and post-reconstruction power spectra, $P_{\rm pre}$ and $P_{\rm post}$, together with their cross-power spectrum, $P_{\rm cross}$, for the Luminous Red Galaxies (LRGs) in the DESI Data Release 1 (DR1). We jointly analyse these observables with an emulator-based full-shape modeling framework, thereby, for the first time, we extract complementary nonlinear information from the galaxy density field before and after reconstruction in real survey data. Specifically, including $P_{\rm post}$ and $P_{\rm cross}$ in addition to $P_{\rm pre}$ (hereafter $P_{\rm all}$) yields an improvement of approximately $18$-$27\%$ in the $σ_8$ constraint in both $Λ$CDM and $w$CDM, depending on the redshift bin, relative to the $P_{\rm pre}$-only analysis with the cosmic microwave background distance priors (hereafter CMB). In $w$CDM, the joint CMB+$P_{\rm all}$ analysis can tighten the constraints on $w$ by approximately $5$-$15\%$ across the two LRG redshift bins, compared to the CMB+$P_{\rm pre}$ combination. Further incorporating the Type Ia supernova dataset and comparing the cosmological constraints in $w$CDM from each individual power-spectrum component with those from the full combination, we find that $P_{\rm all}$ consistently provides the tightest constraints. From the joint CMB+$P_{\rm all}$+DES-Dovekie dataset, we obtain $Ω_m = 0.314 \pm 0.0048$ and $w = -0.988 \pm 0.023$ for the \texttt{LRG1} sample, and $Ω_m = 0.318 \pm 0.0046$ and $w = -0.988 \pm 0.025$ for \texttt{LRG2}. These results demonstrate that combining pre- and post-reconstruction power spectra with their cross-correlation enables DESI to harvest additional nonlinear information, leading to tighter constraints on cosmological parameters. |
| title | Nonlinear Information from DESI Luminous Red Galaxies: An Emulator-Based Analysis of Pre- and Post-Reconstruction Power Spectra |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2603.25693 |