论文标题
在磁场存在下,无质量夸克物质和强子共振气体的电导率的量子表达
Quantum expression for the electrical conductivity of massless quark matter and of the hadron resonance gas in the presence of a magnetic field
论文作者
论文摘要
我们已经研究了在存在强子共振气体(HRG)和无质量夸克物质的磁场的情况下,电导率的经典和量子表达式及其数值估计。 Dash等人先前研究了HRG物质运输系数的经典结果。 [物理。 Rev. D 102,016016(2020)]使用Boltzmann方程中的标准松弛时间近似。在同一参考文献中,还估计了无质量和HRG物质在磁场存在下从各向同性转运系数到各向异性系数的过渡。这导致了上限或Stefan-Boltzmann(SB)类型限制到运输系数的非扰动域转变。在类似的情况下,目前的工作集中在HRG从高温和低磁场域到低温和高磁场的经典转变。我们还将HRG结果的量子修饰与无质量夸克物质进行了比较,在那里我们观察到了相反的趋势。由于介子分布的不同,介子和重子之间也发现了类似的量子效应。尽管HRG同时包含介子和重子,但其净磁透明学相空间的兰道量化揭示了介子或玻色子为主的量子修饰。这就是为什么HRG结果的量子修改揭示了与无质量夸克物质的趋势相反的趋势,而夸克物质面临费米子量子修饰的原因。
We have studied the classical and quantum expressions of electrical conductivity and their numerical estimation in the presence of a magnetic field for hadron resonance gas (HRG) and massless quark matter. Classical results of transport coefficients of HRG matter in the presence of a magnetic field were studied previously by Dash et al. [Phys. Rev. D 102, 016016 (2020)] using the standard relaxation time approximation in the Boltzmann equation. In the same reference, the transition from isotropic transport coefficients to anisotropic coefficients in the presence of a magnetic field was also estimated for massless and HRG matter. This led to an upper limit or Stefan-Boltzmann (SB) type limit to the nonperturbative domain transition of transport coefficients. In a similar context, the present work has concentrated on the classical to quantum transition of HRG transport from the domain of high temperature and low magnetic field to that of low temperature and high magnetic field. We have also compared the quantum modification of HRG results with that of massless quark matter, where we observed an opposite trend. A similar kind of quantum effect is also noticed between mesons and baryons due to their different particle distribution functions. Despite the fact that HRG contains both mesons and baryons, Landau quantization of its net magnetothermodynamic phase space reveals meson- or boson-dominated quantum modification. That is why the quantum modification of HRG results reveals the opposite trend from that of massless quark matter, which faces fermionic quantum modification.