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arXiv 2104.10012hep-lathep-phhep-th
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有限密度SU中的静磁化率(2)格点规范理论

Static magnetic susceptibility in finite-density SU(2) lattice gauge theory

P. V. Buividovich, D. Smith, L. von Smekal

摘要:

我们在格点规范理论中用$SU(2)$在有限化学势$μ$下研究了静态磁化率$χ(T, μ)$。利用线性响应理论,我们发现$SU(2)$规范理论在高温退禁闭区和低温禁闭区都表现出顺磁行为。顺磁响应随温度的升高和化学势的增大而增强。对于我们的温度范围$0.727 \leq T/T_c \leq 2.67$,$χ(T, μ)$在$μ=0$周围的$μ/T$的偶次幂的第一膨胀系数接近于自由夸克的膨胀系数,并且位于范围$(2 \ldots 5) \cdot 10^{-3}$内。最强的顺磁响应发现在双夸克凝聚相在$μ> m_π/2$。

英文摘要:

We study static magnetic susceptibility $χ(T, μ)$ in $SU(2)$ lattice gauge theory with $N_f = 2$ light flavours of dynamical fermions at finite chemical potential $μ$. Using linear response theory we find that $SU(2)$ gauge theory exhibits paramagnetic behavior in both the high-temperature deconfined regime and the low-temperature confining regime. Paramagnetic response becomes stronger at higher temperatures and larger values of the chemical potential. For our range of temperatures $0.727 \leq T/T_c \leq 2.67$, the first coefficient of the expansion of $χ(T, μ)$ in even powers of $μ/T$ around $μ=0$ is close to that of free quarks and lies in the range $(2 \ldots 5) \cdot 10^{-3}$. The strongest paramagnetic response is found in the diquark condensation phase at $μ> m_π/2$.

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