Thermal photon emission from quark-gluon plasma: 1+1D magnetohydrodynamics results
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| Format: | Preprint |
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2025
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| author | Xiong, Jie Fan, Xiang Jing, Jing Yang, Weishan She, Duan Jiang, Ze-Fang |
| author_facet | Xiong, Jie Fan, Xiang Jing, Jing Yang, Weishan She, Duan Jiang, Ze-Fang |
| contents | We investigate thermal photon production in the quark-gluon plasma (QGP) under strong magnetic fields using a magnetohydrodynamic (MHD) framework. Adopting the Bjorken flow model with power-law decaying magnetic fields $\mathbf{B}(τ) = \mathbf{B}_0 (τ_0/τ)^a$ (where $a$ controls the decay rate, $B_0 = \sqrtσ T_0^2$, and $σ$ characterizes the initial field strength), we employ relativistic ideal fluid dynamics under the non-resistive approximation. The resulting QGP temperature evolution exhibits distinct $a$- and $σ$-dependent behaviors. Thermal photon production rates are calculated for three dominant processes: Compton scattering with $q\bar{q}$ annihilation (C+A), bremsstrahlung (Brems), and $q\bar{q}$ annihilation with additional scattering (A+S). These rates are integrated over the space-time volume to obtain the photon transverse momentum $(p_T)$ spectrum. Our results demonstrate that increasing $a$ enhances photon yields across all $p_T$, with $a \to \infty$ (super-fast decay) providing an upper bound. For $a = 2/3$, larger $σ$ suppresses yields through accelerated cooling, whereas for $a \to \infty$, larger $σ$ enhances yields via prolonged thermal emission. Low-$p_T$ photons receive significant contributions from all QGP evolution stages, while high-$p_T$ photons originate predominantly from early times. The central rapidity region $(y=0)$ dominates the total yield. This work extends photon yield studies to the MHD regime under strong magnetic fields, elucidating magnetic field effects on QGP electromagnetic signatures and establishing foundations for future investigations of magnetization and dissipative phenomena. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_06604 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Thermal photon emission from quark-gluon plasma: 1+1D magnetohydrodynamics results Xiong, Jie Fan, Xiang Jing, Jing Yang, Weishan She, Duan Jiang, Ze-Fang High Energy Physics - Phenomenology We investigate thermal photon production in the quark-gluon plasma (QGP) under strong magnetic fields using a magnetohydrodynamic (MHD) framework. Adopting the Bjorken flow model with power-law decaying magnetic fields $\mathbf{B}(τ) = \mathbf{B}_0 (τ_0/τ)^a$ (where $a$ controls the decay rate, $B_0 = \sqrtσ T_0^2$, and $σ$ characterizes the initial field strength), we employ relativistic ideal fluid dynamics under the non-resistive approximation. The resulting QGP temperature evolution exhibits distinct $a$- and $σ$-dependent behaviors. Thermal photon production rates are calculated for three dominant processes: Compton scattering with $q\bar{q}$ annihilation (C+A), bremsstrahlung (Brems), and $q\bar{q}$ annihilation with additional scattering (A+S). These rates are integrated over the space-time volume to obtain the photon transverse momentum $(p_T)$ spectrum. Our results demonstrate that increasing $a$ enhances photon yields across all $p_T$, with $a \to \infty$ (super-fast decay) providing an upper bound. For $a = 2/3$, larger $σ$ suppresses yields through accelerated cooling, whereas for $a \to \infty$, larger $σ$ enhances yields via prolonged thermal emission. Low-$p_T$ photons receive significant contributions from all QGP evolution stages, while high-$p_T$ photons originate predominantly from early times. The central rapidity region $(y=0)$ dominates the total yield. This work extends photon yield studies to the MHD regime under strong magnetic fields, elucidating magnetic field effects on QGP electromagnetic signatures and establishing foundations for future investigations of magnetization and dissipative phenomena. |
| title | Thermal photon emission from quark-gluon plasma: 1+1D magnetohydrodynamics results |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2510.06604 |