Exploring Rényi Entropic Cosmology Constrained by DESI DR2 BAO and Complementary Late-Time Observations

[2604.22450] Exploring Rényi Entropic Cosmology Constrained by DESI DR2 BAO and Complementary Late-Time Observations Skip to main content Search Submit Donate Log in General Relativity and Quantum Cosmology arXiv:2604.22450 (gr-qc) [Submitted on 24 Apr 2026 ( v1 ), last revised 27 Aug 2026 (this version, v2)] Title: Exploring Rényi Entropic Cosmology Constrained by DESI DR2 BAO and Complementary Late-Time Observations Authors: Rajdeep Mazumdar , Kalyan Malakar , Kalyan Bhuyan View PDF HTML (experimental) Abstract: We investigate the late-time cosmological viability of Rényi entropic cosmology (REC) by confronting its modified Friedmann dynamics with DESI DR2 BAO, cosmic chronometers, gravitational-wave standard sirens, redshift-space distortions, and two independent Type Ia supernova compilations, PantheonPlus and Union3. Unlike earlier works, we obtain a stringent constraint on the Rényi parameter $\lambda \sim (3.7\text{--}3.8)\times10^{-124}$, with the resulting value even satisfying recent Big Bang Nucleosynthesis and baryogenesis bounds. Across all observational combinations, REC yields $H_0\simeq68.2$--$68.4$ $km\,s^{-1}\,Mpc^{-1}$ and $\Omega_{m0}\simeq0.291$--$0.295$, with a transition from deceleration to acceleration at $z_{\rm tr}\simeq0.66$--$0.68$. The effective equation of state remains quintessence-like, with $w_{\rm eff}(0)\simeq-0.68$, and does not cross the phantom boundary. REC provides a modest improvement in the minimum $\chi^2$ relative to $\Lambda$CDM, while the AIC, DIC, BIC, and Bayesian evidence indicate that the preference for REC is statistically competitive but not decisive. Conclusively, the results show that Rényi entropy can produce a controlled modification of the late-time expansion history while remaining observationally close to $\Lambda$CDM. Comments: 17 pages, 4 figures, and 6 tables (Some new datasets have been added) Subjects: General Relativity and Quantum Cosmology (gr-qc) Cite as: arXiv:2604.22450 [gr-qc] (or arXiv:2604.22450v2 [gr-qc] for this version) https://doi.org/10.48550/arXiv.2604.22450 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Rajdeep Mazumdar [ view email ] [v1] Fri, 24 Apr 2026 11:08:31 UTC (1,681 KB) [v2] Thu, 27 Aug 2026 09:03:05 UTC (6,875 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: gr-qc < prev | next > new | recent | 2026-04 References & Citations INSPIRE HEP SciX Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) IArxiv recommender toggle IArxiv Recommender ( What is IArxiv? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs . Which authors of this paper are endorsers? | Disable MathJax ( What is MathJax? ) We gratefully acknowledge support from our major funders , member institutions , and all contributors. About · Help · Contact · Subscribe · Copyright · Privacy · Accessibility · Operational Status (opens in new tab) Major funding support from (opens in new tab) (opens in new tab) (opens in new tab)

Related documents

• Exploring Rényi Entropic Cosmology Constrained by DESI DR2 BAO and Complementary Late-Time Observations#674383
• Is DESI Seeing Dynamical Dark Energy, or a Cosmic Glitch in Gravity?#1154442
• Comparing Mass-Varying Neutrino Dark Energy Models with DESI DR2: Cosmological Constraints and Bayesian Evidence#1051583
• Peer review The Atacama Cosmology Telescope - DR6 Constraints on Extended Cosmological Models Blake Sherwin Cambridge#97125
• The DESI-Lensing Mock Challenge: large-scale cosmological analysis of 3x2-pt statistics#185481