来自AdS/CFT的非对角风味敏感性
Off-diagonal Flavour Susceptibilities from AdS/CFT
摘要：
利用引力对偶研究了强耦合和大$N$下与两种夸克味耦合的${\cal N}=4$ SU（N）超Yang-Mills等离子体的味耦合度.非对角磁化率是1/N抑制的，我们将其计算为重力侧的单圈效应。相反，天真的外推从微扰的结果，它达到一个有限的值在无限耦合的限制。此外，它的参数形式与等离子体中是否存在介子束缚态无关。我们的结论是，必须谨慎行使时，得出结论的QCD等离子体从晶格计算的夸克介电常数。
英文摘要：
We study flavour susceptibilities in the ${\cal N}=4$ SU(N) super Yang-Mills plasma coupled to two quark flavours at strong coupling and large $N$ by means of its gravity dual. The off-diagonal susceptibility is 1/N-suppressed and we compute it as a one-loop effect on the gravity side. Contrary to naive extrapolation from perturbative results, it attains a finite value in the infinite-coupling limit. Moreover, its parametric form is independent of whether or not meson bound states exist in the plasma. We conclude that caution must be exercised when drawing conclusions about the QCD plasma from lattice calculations of quark susceptibilities.
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