Nonminimally Coupled Quintessence with Double Exponential Potential: Observational Evidence Against Big Crunch Singularity

[2506.11755] Nonminimally Coupled Quintessence with Double Exponential Potential: Observational Evidence Against Big Crunch Singularity Skip to main content Search Submit Donate Log in General Relativity and Quantum Cosmology arXiv:2506.11755 (gr-qc) [Submitted on 13 Jun 2025 ( v1 ), last revised 25 Aug 2026 (this version, v4)] Title: Nonminimally Coupled Quintessence with Double Exponential Potential: Observational Evidence Against Big Crunch Singularity Authors: Yerlan Myrzakulov , Saddam Hussain , Mohd Shahalam View PDF HTML (experimental) Abstract: We investigate a class of scalar field dark energy models non-minimally coupled to gravity, characterized by a double exponential potential and parameterized coupling $\xi$. We study the cosmological dynamics for a recently proposed descending dark energy model, namely, Q-SC-CDM. Initially, we choose distinct values of coupling parameter. For some values of $\xi$, the evolution of the universe is split up into three different phases: {\it decelerated expansion (early time), accelerated expansion (late-time) and slow-contraction (future era)}, and provide Big Crunch Singularity at distant future. In other scenario, the phase of slow-contraction vanishes, cosmic acceleration is obtained at current epoch, and the universe gets de-Sitter expansion at distant future. We confront the model with various datasets, including Cosmic Chronometers, Type Ia Supernovae (Pantheon+, DES, and Union 3), and Baryon Acoustic Oscillation measurements from DESI. Our analysis reveals that observational constraints naturally favor regions of parameter space in which the model avoids future singularities and slow-contraction phases, even for relatively small values of $\xi \simeq 0.12$. The preferred solutions yield values of $\Omega_{m}$, $H_0$, and $r_d$ that are consistent with those of $\Lambda$CDM at the $68\%$ confidence level. In contrast, the models with fixed couplings $\xi=0.3$ and $\xi=0.5$, which predict $H_0>70$ km/s/Mpc, are strongly disfavored relative to $\Lambda$CDM by the current datasets. Finally, the phase-space analysis confirms that the observationally constrained model with $\xi\simeq 0.12$ evolves toward a stable de Sitter attractor. Comments: 21 pages, 12 figures, 3 tables, Title Change, Accepted in Eur. Phys. J. C Subjects: General Relativity and Quantum Cosmology (gr-qc) ; Cosmology and Nongalactic Astrophysics (astro-ph.CO) Cite as: arXiv:2506.11755 [gr-qc] (or arXiv:2506.11755v4 [gr-qc] for this version) https://doi.org/10.48550/arXiv.2506.11755 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Eur. Phys. J. C 86, 1055 (2026) Related DOI : https://doi.org/10.1140/epjc/s10052-026-16306-7 Focus to learn more DOI(s) linking to related resources Submission history From: Mohd Shahalam [ view email ] [v1] Fri, 13 Jun 2025 13:11:13 UTC (2,100 KB) [v2] Tue, 8 Jul 2025 03:50:47 UTC (2,100 KB) [v3] Mon, 27 Oct 2025 04:57:26 UTC (2,106 KB) [v4] Tue, 25 Aug 2026 03:59:37 UTC (11,215 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: gr-qc < prev | next > new | recent | 2025-06 Change to browse by: astro-ph astro-ph.CO 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. 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