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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2408.04551 |
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| _version_ | 1866909287473741824 |
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| author | Long, Andrew J. Schiappacasse, Enrico D. |
| author_facet | Long, Andrew J. Schiappacasse, Enrico D. |
| contents | In the strong magnetic field of a neutron star's magnetosphere, axions coupled to electromagnetism develop a nonzero probability to convert into photons. Past studies have revealed that the axion-photon conversion can be resonantly enhanced. We recognize that the axion-photon resonance admits two parametrically distinct resonant solutions, which we call the mass-matched resonance and the Euler-Heisenberg assisted resonance. The mass-matched resonance occurs at a point in the magnetosphere where the radially-varying plasma frequency crosses the axion mass $ω_\mathrm{pl} \approx m_a$. The Euler-Heisenberg assisted resonance occurs where the axion energy satisfies $ω\approx (2 ω_\mathrm{pl}^2 / 7 g_{γγγγ} \bar{B}^2 )^{1/2}$. This second resonance is made possible though the strong background magnetic field $\bar{B}$ as well as the nonzero Euler-Heisenberg four-photon self interaction, which has the coupling $g_{γγγγ} = 8 α^2 / 45 m_e^4$. We study the resonant conversion of relativistic axion dark radiation into photons via the Euler-Heisenberg assisted resonance, and we calculate the expected electromagnetic radiation assuming different values for the axion-photon coupling $g_{aγγ}$ and different amplitudes for the axion flux onto the neutron star $Φ_a$. We briefly discuss several possible sources of axion dark radiation. Achieving a sufficiently strong axion flux to induce a detectable electromagnetic signal seems unlikely. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04551 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Resonant conversion of axion dark radiation into terahertz electromagnetic radiation in a neutron star magnetosphere Long, Andrew J. Schiappacasse, Enrico D. High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics In the strong magnetic field of a neutron star's magnetosphere, axions coupled to electromagnetism develop a nonzero probability to convert into photons. Past studies have revealed that the axion-photon conversion can be resonantly enhanced. We recognize that the axion-photon resonance admits two parametrically distinct resonant solutions, which we call the mass-matched resonance and the Euler-Heisenberg assisted resonance. The mass-matched resonance occurs at a point in the magnetosphere where the radially-varying plasma frequency crosses the axion mass $ω_\mathrm{pl} \approx m_a$. The Euler-Heisenberg assisted resonance occurs where the axion energy satisfies $ω\approx (2 ω_\mathrm{pl}^2 / 7 g_{γγγγ} \bar{B}^2 )^{1/2}$. This second resonance is made possible though the strong background magnetic field $\bar{B}$ as well as the nonzero Euler-Heisenberg four-photon self interaction, which has the coupling $g_{γγγγ} = 8 α^2 / 45 m_e^4$. We study the resonant conversion of relativistic axion dark radiation into photons via the Euler-Heisenberg assisted resonance, and we calculate the expected electromagnetic radiation assuming different values for the axion-photon coupling $g_{aγγ}$ and different amplitudes for the axion flux onto the neutron star $Φ_a$. We briefly discuss several possible sources of axion dark radiation. Achieving a sufficiently strong axion flux to induce a detectable electromagnetic signal seems unlikely. |
| title | Resonant conversion of axion dark radiation into terahertz electromagnetic radiation in a neutron star magnetosphere |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2408.04551 |