Polarized electromagnetic radiation by chiral media with time-dependent chiral chemical potential
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911110057164800 |
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| author | Tuchin, Kirill |
| author_facet | Tuchin, Kirill |
| contents | We investigate photon production from media characterized by a time-dependent chiral chemical potential $μ_5(t)$. We first consider the chiral anomaly as a small perturbation and show that $μ_5\to 2γ$ process generates non-polarized radiation, as the probabilities of producing right and left-handed photons are equal. In chiral semimetal with a vanishing chiral chemical potential but a finite separation of Weyl nodes, ${\bf Δ}(t)$, the photon production vanishes at the leading order of perturbation theory. We then employ the method of Bogolyubov transformation to obtain the photon spectrum that sums up all powers of $μ_5$. Employing the exactly solvable model $μ_5(t) \propto A+B\tanh(t/τ)$, we demonstrate that the spectrum exhibits strong circular polarization, whose direction is determined by the sign of $μ_5$. The spectrum contains resonances associated with the instability of the electromagnetic field in chiral media. We discuss potential phenomenological applications of these findings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_12923 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polarized electromagnetic radiation by chiral media with time-dependent chiral chemical potential Tuchin, Kirill High Energy Physics - Phenomenology Materials Science Nuclear Theory We investigate photon production from media characterized by a time-dependent chiral chemical potential $μ_5(t)$. We first consider the chiral anomaly as a small perturbation and show that $μ_5\to 2γ$ process generates non-polarized radiation, as the probabilities of producing right and left-handed photons are equal. In chiral semimetal with a vanishing chiral chemical potential but a finite separation of Weyl nodes, ${\bf Δ}(t)$, the photon production vanishes at the leading order of perturbation theory. We then employ the method of Bogolyubov transformation to obtain the photon spectrum that sums up all powers of $μ_5$. Employing the exactly solvable model $μ_5(t) \propto A+B\tanh(t/τ)$, we demonstrate that the spectrum exhibits strong circular polarization, whose direction is determined by the sign of $μ_5$. The spectrum contains resonances associated with the instability of the electromagnetic field in chiral media. We discuss potential phenomenological applications of these findings. |
| title | Polarized electromagnetic radiation by chiral media with time-dependent chiral chemical potential |
| topic | High Energy Physics - Phenomenology Materials Science Nuclear Theory |
| url | https://arxiv.org/abs/2508.12923 |