![\"Researchers](\"https:\/\/www.europesays.com\/uk\/wp-content\/uploads\/2025\/06\/researchers-unveil-axi.jpg\" "\\"The")
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The histogram for the BI parameter and the trace\u00a0torsion mass in GeV. Credit: Xinjiang Astronomical Observatory<\/p>\n
A new study has revealed a novel effect caused by dark photons\u2014hypothetical particles thought to make up a portion of the universe’s elusive dark matter. This discovery, made within the framework of Einstein\u2013Cartan\u2013Holst gravity, provides new insights into the fundamental interactions between matter and gravity.<\/p>\n
The study was conducted by Prof. Gao Zhifu from the Xinjiang Astronomical Observatory of the Chinese Academy of Sciences, in collaboration with Dr. Luiz Carlos Garcia de Andrade from the State University of Rio de Janeiro, Brazil. Their findings, which include the first identification of a key physical quantity known as the Barbero\u2013Immirzi (BI) parameter induced by dark photons, are published<\/a> in The European Physical Journal C.<\/p>\n A large portion of the universe is filled with invisible matter known as dark matter<\/a>, and the dark photon is one of its leading theoretical candidates. As a hypothetical particle beyond the Standard Model, the dark photon exhibits electromagnetic-like interactions through kinetic mixing with the ordinary photon. Unlike photons, however, dark photons possess mass and interact much more weakly with charged particles.<\/p>\n The BI parameter in loop quantum gravity (LQG) theory may influence gravitational waves and their interactions with matter. Studying this parameter could reveal connections to dark matter and dark energy<\/a>.<\/p>\n Moreover, Einstein\u2013Cartan\u2013Holst gravity, an extension of general relativity, introduces “torsion,” which relates to spacetime twisting and is linked to matter spin. This connection aids the study of matter-gravity interactions.<\/p>\n The researchers uncovered a torsion\u2013axion conversion mechanism, demonstrating that dark photons can induce the BI parameter through a special gravitational coupling. Based on theoretical analysis<\/a> and simulations, they investigated the magnetic helicity instability of dark photons, revealing how the axion oscillation frequency is regulated by the BI parameter.<\/p>\n These findings provide a deeper theoretical framework for understanding the early universe<\/a> and offer new avenues for testing beyond-Standard-Model physics in high-energy experiments, such as those conducted at the Large Hadron Collider (LHC).<\/p>\n More information:<\/strong> \n\t\t\t\t\t\t\t\t\t\t\t\t\tProvided by \t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n \n\t\t\t\t\t\t\t\t\t\t\t\tCitation<\/strong>: \n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n\t\t\t\t\t\t\t\t\t\t\t\tZhi-Fu Gao et al, Dark photons and tachyonic instability induced by Barbero\u2013Immirzi parameter and axion\u2013torsion transmutation, The European Physical Journal C (2025). DOI: 10.1140\/epjc\/s10052-025-14065-5<\/a><\/p>\n
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tChinese Academy of Sciences<\/a>
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\n\t\t\t\t\t\t\t\t\t\t\t\tResearchers unveil axion-torsion coupling via dark photons (2025, June 3)
\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 9 June 2025
\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2025-06-unveil-axion-torsion-coupling-dark.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n
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