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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.05906 |
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| _version_ | 1866915987556663296 |
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| author | Guo, Wen-Qing |
| author_facet | Guo, Wen-Qing |
| contents | The particle nature of dark matter (DM) remains one of the most significant enigmas in modern cosmology. Axion-like particles (ALPs), as well-motivated candidates for cold dark matter, can undergo radiative decay into photon pairs, a process that is significantly enhanced in the presence of ambient radiation fields. In this work, we propose a novel probe of $μ{\rm eV}$-scale ALP DM by cross-correlating radio intensity mapping (IM) with the large-scale galaxy distribution from the 2MASS Redshift Survey (2MRS) in the local universe ($z\leq 0.1$). We develop a comprehensive theoretical framework that incorporates stimulated decay effects driven by both the Cosmic Microwave Background (CMB) and a bottom-up modeled extragalactic radio background (ERB). By forecasting the sensitivity of the Square Kilometre Array (SKA) Phase 2, we demonstrate that this cross-correlation technique provides a promising and complementary approach to searching for ALP DM signals. This study establishes a new proof-of-concept for utilizing next-generation radio telescopes to probe ALP dark matter on cosmic scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_05906 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Axion-Like Particle Dark Matter Intensity Mapping: A New Probe via Cross-Correlation with Galaxy Surveys Guo, Wen-Qing Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena The particle nature of dark matter (DM) remains one of the most significant enigmas in modern cosmology. Axion-like particles (ALPs), as well-motivated candidates for cold dark matter, can undergo radiative decay into photon pairs, a process that is significantly enhanced in the presence of ambient radiation fields. In this work, we propose a novel probe of $μ{\rm eV}$-scale ALP DM by cross-correlating radio intensity mapping (IM) with the large-scale galaxy distribution from the 2MASS Redshift Survey (2MRS) in the local universe ($z\leq 0.1$). We develop a comprehensive theoretical framework that incorporates stimulated decay effects driven by both the Cosmic Microwave Background (CMB) and a bottom-up modeled extragalactic radio background (ERB). By forecasting the sensitivity of the Square Kilometre Array (SKA) Phase 2, we demonstrate that this cross-correlation technique provides a promising and complementary approach to searching for ALP DM signals. This study establishes a new proof-of-concept for utilizing next-generation radio telescopes to probe ALP dark matter on cosmic scales. |
| title | Axion-Like Particle Dark Matter Intensity Mapping: A New Probe via Cross-Correlation with Galaxy Surveys |
| topic | Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2605.05906 |