标题： 全息零声对于4d中的$\mathcal{N}=2$SCFTs 显示英文标题

标题： Holographic zero sound for $\mathcal{N}=2$ SCFTs in 4d

摘要： 我们为四维的$\mathcal{N}=2$ SCFTs 建立了金属全息理论，在存在有限$U(1)$化学势的情况下。 我们计算了两点关联函数，并在低频和低动量的区域内研究了它们的性质。 颜色部分揭示了无能隙激发，其中一种以有限的相速度传播，而另一种模式则通过散射衰减。 另一方面，味部分揭示了包含准粒子激发的谱，这些激发以确定的相速度传播，同时还包含以有限群速度传播且量子衰减的模式，这在精神上与 Landau 的零声模式非常相似。 我们还计算了相关的交流电导率，这些电导率在$\mathcal{N}=2$ SCFTs 的不同（颜色和味）部分表现出不同的特性。 显示英文摘要

摘要： We build up the notion of metallic holography for $\mathcal{N}=2$ SCFTs in four dimensions, in the presence of a finite $U(1)$ chemical potential. We compute two point correlation functions and study their properties in the regime of low frequency and low momentum. The color sector reveals gapless excitations, one of which propagates with a finite phase velocity while the other mode attenuates through scattering. The flavour sector, on the other hand, reveals spectrum that contains quasiparticle excitations which propagate with a definite phase velocity together with modes that propagate with a finite group velocity which quantum attenuates quite similar in spirit as that of Landau's zero sound modes. We also compute associated AC conductivities, which exhibit different characteristics for different (color and flavour) sectors of $\mathcal{N}=2$ SCFTs.