Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity

[2411.17186] Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search High Energy Physics - Phenomenology arXiv:2411.17186 (hep-ph) [Submitted on 26 Nov 2024 ( v1 ), last revised 14 Apr 2026 (this version, v4)] Title: Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity Authors: Wenyi Wang , Sousuke Noda , Taishi Katsuragawa View a PDF of the paper titled Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity, by Wenyi Wang and 2 other authors View PDF HTML (experimental) Abstract: The scalar-tensor theory of gravity, a modified gravity theory, introduces a fundamental scalar field that can serve as dynamical dark energy, driving the late-time accelerated expansion of the Universe. In this work, we analyze electromagnetic (EM) radiations arising from scalar fields and compare these features with those induced by axion-like particles (ALPs). Scalar and ALP fields couple differently to the EM field due to their distinct parity properties, $\phi F_{\mu\nu} F^{\mu\nu}$ for scalar fields and $\phi F_{\mu\nu} \tilde{F}^{\mu\nu}$ for ALPs. Building on analytical methods developed for ALPs, this work presents a theoretical feasibility analysis that demonstrates how the scalar field could produce observable EM signatures from oscillating field configurations. We also show that resonance effects can amplify the EM radiation for the scalar field under specific conditions, and that the enhancement mechanisms depend on the coupling structure and the configuration of the background magnetic field. Resonance phenomena can accentuate the differences in signal strength and spectral features, potentially aiding future observations in distinguishing scalar fields from ALPs. Although our studies apply to general scalar fields, we embed them within the framework of scalar-tensor theory and discuss the mass and coupling parameter in the context of testing modified gravity. This work provides a theoretical framework for studying generic pure and pseudo-scalar fields on an equal footing and suggests new avenues for observational tests of modified gravity scenarios alongside ALP models. Comments: 41 pages,7 figures Subjects: High Energy Physics - Phenomenology (hep-ph) ; High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Theory (hep-th) Cite as: arXiv:2411.17186 [hep-ph] (or arXiv:2411.17186v4 [hep-ph] for this version) https://doi.org/10.48550/arXiv.2411.17186 Focus to learn more arXiv-issued DOI via DataCite Related DOI : https://doi.org/10.1142/S0219887826501938 Focus to learn more DOI(s) linking to related resources Submission history From: Wenyi Wang [ view email ] [v1] Tue, 26 Nov 2024 07:51:07 UTC (551 KB) [v2] Mon, 2 Dec 2024 08:53:45 UTC (552 KB) [v3] Mon, 7 Jul 2025 06:50:55 UTC (557 KB) [v4] Tue, 14 Apr 2026 07:48:14 UTC (634 KB) Full-text links: Access Paper: View a PDF of the paper titled Scalar-Induced Electromagnetic Radiation: Comparison with Axion-Like Particles and Implications for Modified Gravity, by Wenyi Wang and 2 other authors View PDF HTML (experimental) TeX Source view license Current browse context: hep-ph < prev | next > new | recent | 2024-11 Change to browse by: astro-ph astro-ph.HE gr-qc hep-th References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... 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