磁场诱导的夸克物质中Urca辐射的增强与猝灭
Magnetic field-induced enhancement and quenching of Urca emission in quark matter
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中文总结 AI 辅助
该研究通过第一性原理场论方法，揭示强磁化致密夸克物质中Urca辐射随磁场变化的增强、振荡、共振及猝灭规律，还发现Urca共振磁场附近纵向动量辐射的各向异性。
中文摘要 AI 辅助
我们采用第一性原理场论方法，研究致密星相关条件下强磁化致密夸克物质的中微子辐射。我们考虑电子和夸克态的朗道能级量子化，发现其会强烈改变Urca过程的运动学特性。具体而言，夸克量子化限制了夸克和电子能量可同时处于各自费米面附近的可用相空间。在中等强度磁场下，夸克量子化尚未显著显现时，辐射率平均随场强增大而升高；而在极强磁场区域，日益受限的相空间首先引发舒布尼科夫-德哈斯型振荡，随后在一系列离散的Urca共振磁场值附近出现类共振尖峰，尖峰之间的区域辐射被强烈抑制。当|eB|≳6μ_eμ_u时，对应所考虑的代表性模型参数下B≳1.5×10^19 G，辐射率几乎完全猝灭。我们还发现，在Urca共振磁场值附近，纵向动量辐射存在显著各向异性。
英文摘要
Using first-principles field-theoretic methods, we investigate neutrino emission from strongly magnetized dense quark matter under conditions relevant to compact stars. We account for Landau-level quantization of both electron and quark states and show that it strongly modifies the kinematics of Urca processes. In particular, quark quantization restricts the available phase space in which both quark and electron energies can simultaneously lie near their respective Fermi surfaces. At moderately strong magnetic fields, before pronounced quark quantization sets in, the emission rate tends to increase on average with increasing field strength. In the regime of very strong fields, however, the increasingly restricted phase space first gives rise to Shubnikov--de Haas-type oscillations and then to resonance-like spikes near a discrete sequence of Urca-resonant magnetic field values, separated by regions of strong suppression. Finally, the emission rate becomes nearly completely quenched once $|eB| \gtrsim 6μ_{e}μ_{u}$, corresponding to approximately $B\gtrsim 1.5\times 10^{19}~\mbox{G}$ for the representative set of model parameters considered. We also find significant anisotropy in the longitudinal momentum emission near the Urca-resonant magnetic field values.
发表机构
- College of Integrative Sciences and Arts, Arizona State University（亚利桑那州立大学综合科学与艺术学院）
- Department of Physics, Arizona State University（亚利桑那州立大学物理系）
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