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arXiv 2302.12925hep-phnucl-th
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通过低动量截断研究扩展线性σ模型中的有限体积效应

Finite volume effects in the extended linear sigma model via low momentum cutoff

Győző Kovács, Péter Kovács, Pok Man Lo, Krzysztof Redlich, György Wolf

AI总结:

针对重离子碰撞的有限尺寸效应问题,采用低动量截断方法在矢量介子扩展Polyakov夸克-介子模型中开展研究,发现有限体积会显著改变强相互作用物质的热力学性质、相变及临界端点位置。

摘要:

与假设体积无穷大的热力学极限下的场论计算不同,重离子碰撞始终带有有限尺寸效应。预期足够小的系统尺寸会影响强相互作用物质的热力学量和相图。为研究这些效应,也可在有效模型框架内考虑系统的有限空间范围,方法是通过离散化限制动量积分,或在简化情形下使用低动量截断。我们在矢量介子扩展的Polyakov夸克-介子模型(Polyakov quark-meson model)中研究了有限体积的效应,发现热力学性质和相变,尤其是临界端点的位置,发生了显著变化。

英文摘要:

Contrary to field theoretical calculations in the thermodynamic limit where the volume is assumed to be infinitely large, the heavy-ion collisions always carry the effects of finite size. A sufficiently small system size is expected to affect the thermodynamic quantities and the phase diagram of the strongly interacting matter. To study these effects one can take into account the finite spatial extent of the system within the framework of an effective model too, via the restriction of the momentum integrals using discretization or in a simplified case using a low momentum cutoff. We investigated the effects of the finite volume in a vector meson extended Polyakov quark-meson model and found a remarkable change in the thermodynamics and the phase transition, especially in the location of the critical endpoint.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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