Interacting Scalar Fields as Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity

[2507.05207] Interacting Scalar Fields as Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search General Relativity and Quantum Cosmology arXiv:2507.05207 (gr-qc) [Submitted on 7 Jul 2025 ( v1 ), last revised 10 Apr 2026 (this version, v3)] Title: Interacting Scalar Fields as Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity Authors: Saddam Hussain , Simran Arora , Yamuna Rana , Benjamin Rose , Anzhong Wang View a PDF of the paper titled Interacting Scalar Fields as Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity, by Saddam Hussain and 4 other authors View PDF HTML (experimental) Abstract: A Gauss-Bonnet (GB) coupled scalar field $\phi$, responsible for the late-time cosmic acceleration and interacting with a coherent scalar field $\psi$ through an interaction potential $W(\phi,\psi)$, is considered from the point of view of particle physics for two different models. The non-minimal coupling between the GB curvature term and the field $\phi$ leads to a time-dependent speed of gravitational waves (GWs), which is fixed to unity in order to be consistent with current GW observations, rendering the GB coupling function model-independent. We investigate the dynamical stability of the system by formulating it as an autonomous system, and provide a detailed discussion on the choice of initial conditions required to obtain stable background evolution of the models. We constrain the model parameters using various sets of observational data, including both early- and late-time probes. We incorporate the improved Dark Energy Survey (DES) 5-year Type Ia supernova sample (DES-SN5YR), referred to as DES-Dovekie, which exhibits substantially lower tension with the Pantheon+ supernova sample. We find that both models are physically viable and closely follow the $\Lambda$CDM trend for the Pantheon+ and DES samples. However, upon including the Roman mock data, a significant departure is observed at higher redshifts, yielding statistically strong preference over the flat $\Lambda$CDM model. Comments: 50 pages, 13 figures, 3 tables, and added an updated DES Supernova sample (DES-Dovekie). The current version has been accepted for the publication in JCAP Subjects: General Relativity and Quantum Cosmology (gr-qc) ; High Energy Physics - Phenomenology (hep-ph) Cite as: arXiv:2507.05207 [gr-qc] (or arXiv:2507.05207v3 [gr-qc] for this version) https://doi.org/10.48550/arXiv.2507.05207 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Saddam Hussain [ view email ] [v1] Mon, 7 Jul 2025 17:16:40 UTC (827 KB) [v2] Wed, 18 Feb 2026 04:54:21 UTC (6,083 KB) [v3] Fri, 10 Apr 2026 05:44:06 UTC (6,090 KB) Full-text links: Access Paper: View a PDF of the paper titled Interacting Scalar Fields as Dark Energy and Dark Matter in Einstein scalar Gauss Bonnet Gravity, by Saddam Hussain and 4 other authors View PDF HTML (experimental) TeX Source view license Current browse context: gr-qc < prev | next > new | recent | 2025-07 Change to browse by: hep-ph References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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