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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2504.10407 |
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| author | Zhang, Hanyu Bonici, Marco Rocher, Antoine Percival, Will J. de Mattia, Arnaud Aguilar, Jessica Nicole Ahlen, Steven Alves, Otávio Aviles, Alejandro Lizancos, Anton Baleato Bianchi, Davide Brooks, David Cuceu, Andrei de la Macorra, Axel Doel, Peter Ferraro, Simone Findlay, Nathan Font-Ribera, Andreu Sánchez, Daniel Felipe Forero Forero-Romero, Jaime E. Gontcho, Satya Gontcho A Gutierrez, Gaston Hahn, ChangHoon Howlett, Cullan Ishak, Mustapha Karamanis, Minas Kehoe, Robert Kirkby, David Kremin, Anthony Lahav, Ofer Lai, Yan Landriau, Martin Guillou, Laurent Le Levi, Michael Manera, Marc Maus, Mark Lennard Meisner, Aaron Miquel, Ramon Morawetz, James Moustakas, John Nadathur, Seshadri Newman, Jeffrey A. Niz, Gustavo Noriega, Hernan Enrique Palanque-Delabrouille, Nathalie Pinon, Mathilde Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Saito, Shun Samushia, Lado Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhao, Ruiyang Zhou, Rongpu |
| author_facet | Zhang, Hanyu Bonici, Marco Rocher, Antoine Percival, Will J. de Mattia, Arnaud Aguilar, Jessica Nicole Ahlen, Steven Alves, Otávio Aviles, Alejandro Lizancos, Anton Baleato Bianchi, Davide Brooks, David Cuceu, Andrei de la Macorra, Axel Doel, Peter Ferraro, Simone Findlay, Nathan Font-Ribera, Andreu Sánchez, Daniel Felipe Forero Forero-Romero, Jaime E. Gontcho, Satya Gontcho A Gutierrez, Gaston Hahn, ChangHoon Howlett, Cullan Ishak, Mustapha Karamanis, Minas Kehoe, Robert Kirkby, David Kremin, Anthony Lahav, Ofer Lai, Yan Landriau, Martin Guillou, Laurent Le Levi, Michael Manera, Marc Maus, Mark Lennard Meisner, Aaron Miquel, Ramon Morawetz, James Moustakas, John Nadathur, Seshadri Newman, Jeffrey A. Niz, Gustavo Noriega, Hernan Enrique Palanque-Delabrouille, Nathalie Pinon, Mathilde Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Saito, Shun Samushia, Lado Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhao, Ruiyang Zhou, Rongpu |
| contents | We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based on cosmological perturbation theory (PT). By leveraging physical insights from the galaxy-halo connection, these HOD-informed priors on nuisance parameters substantially mitigate projection effects in extended cosmological models that allow for dynamical dark energy. The resulting credible intervals now encompass the posterior maximum from the baseline analysis using gaussian priors, eliminating a significant posterior shift observed in baseline studies. In the $Λ$CDM framework, a combined DESI DR1 FS information and constraints from the DESI DR1 baryon acoustic oscillations (BAO)-including Big Bang Nucleosynthesis (BBN) constraints and a weak prior on the scalar spectral index-yields $Ω_{\rm m} = 0.2994\pm 0.0090$ and $σ_8 = 0.836^{+0.024}_{-0.027}$, representing improvements of approximately 4% and 23% over the baseline analysis, respectively. For the $w_0w_a$CDM model, our results from various data combinations are highly consistent, with all configurations converging to a region with $w_0 > -1$ and $w_a < 0$. This convergence not only suggests intriguing hints of dynamical dark energy but also underscores the robustness of our HOD-informed prior approach in delivering reliable cosmological constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_10407 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Enhancing DESI DR1 Full-Shape analyses using HOD-informed priors Zhang, Hanyu Bonici, Marco Rocher, Antoine Percival, Will J. de Mattia, Arnaud Aguilar, Jessica Nicole Ahlen, Steven Alves, Otávio Aviles, Alejandro Lizancos, Anton Baleato Bianchi, Davide Brooks, David Cuceu, Andrei de la Macorra, Axel Doel, Peter Ferraro, Simone Findlay, Nathan Font-Ribera, Andreu Sánchez, Daniel Felipe Forero Forero-Romero, Jaime E. Gontcho, Satya Gontcho A Gutierrez, Gaston Hahn, ChangHoon Howlett, Cullan Ishak, Mustapha Karamanis, Minas Kehoe, Robert Kirkby, David Kremin, Anthony Lahav, Ofer Lai, Yan Landriau, Martin Guillou, Laurent Le Levi, Michael Manera, Marc Maus, Mark Lennard Meisner, Aaron Miquel, Ramon Morawetz, James Moustakas, John Nadathur, Seshadri Newman, Jeffrey A. Niz, Gustavo Noriega, Hernan Enrique Palanque-Delabrouille, Nathalie Pinon, Mathilde Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Saito, Shun Samushia, Lado Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhao, Ruiyang Zhou, Rongpu Cosmology and Nongalactic Astrophysics We present an analysis of DESI Data Release 1 (DR1) that incorporates Halo Occupation Distribution (HOD)-informed priors into Full-Shape (FS) modeling of the power spectrum based on cosmological perturbation theory (PT). By leveraging physical insights from the galaxy-halo connection, these HOD-informed priors on nuisance parameters substantially mitigate projection effects in extended cosmological models that allow for dynamical dark energy. The resulting credible intervals now encompass the posterior maximum from the baseline analysis using gaussian priors, eliminating a significant posterior shift observed in baseline studies. In the $Λ$CDM framework, a combined DESI DR1 FS information and constraints from the DESI DR1 baryon acoustic oscillations (BAO)-including Big Bang Nucleosynthesis (BBN) constraints and a weak prior on the scalar spectral index-yields $Ω_{\rm m} = 0.2994\pm 0.0090$ and $σ_8 = 0.836^{+0.024}_{-0.027}$, representing improvements of approximately 4% and 23% over the baseline analysis, respectively. For the $w_0w_a$CDM model, our results from various data combinations are highly consistent, with all configurations converging to a region with $w_0 > -1$ and $w_a < 0$. This convergence not only suggests intriguing hints of dynamical dark energy but also underscores the robustness of our HOD-informed prior approach in delivering reliable cosmological constraints. |
| title | Enhancing DESI DR1 Full-Shape analyses using HOD-informed priors |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.10407 |