{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/boss-full-shape-analysis-from-the-eftoflss","title":"BOSS full-shape analysis from the EFTofLSS with exact time dependence","arxiv_id":"2111.05739","date":"2021-11-10","proceeding":null,"authors":["Pierre Zhang","Yifu Cai"],"abstract":"We re-analyze the full shape of BOSS galaxy two-point function from the Effective-Field Theory of Large-Scale Structure at the one loop within $\\Lambda$CDM with massive neutrinos using a big bang nucleosynthesis (BBN) prior, removing the Einstein-de Sitter (EdS) approximation in the time dependence of the loop, and, properly accounting for the redshift selection over the BOSS samples instead of assuming an effective redshift. We constrain, at $68\\%$-confidence level (CL), the present-day matter fraction to $\\Omega_m=0.322 \\pm 0.018$, the Hubble constant to $H_0=69.1\\pm 0.14$ (km/s)/Mpc, the $\\log$-amplitude of the primordial spectrum to $\\ln (10^{10} A_s) = 2.97 \\pm 0.25$, the spectral tilt to $n_s = 0.938 \\pm 0.082$, and bound the total neutrino mass to $<1.1$ at $95\\%$-CL. We find no significant shift in the posteriors of the cosmological parameters due to the EdS approximation, but a marginal difference in $\\ln (10^{10} A_s)$ due to the effective redshift approximation of about $0.4\\sigma$, where $\\sigma$ is the $68\\%$-confidence interval. Regarding the EdS approximation, we check that the same conclusion holds on simulations of volume like DESI in $\\Lambda$CDM and $w$CDM, with a BBN prior. In contrast, for an approximate, effective redshift, to be assumed, we advocate systematic assessments on redshift selection for ongoing and future large-volume surveys.","url_abs":"https://arxiv.org/abs/2111.05739v2","url_pdf":"https://arxiv.org/pdf/2111.05739v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"boss-full-shape-analysis-from-the-eftoflss","repo_url":"https://github.com/pierrexyz/pybird","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}