标题： 二极振子凝聚体中超越普朗克激发对黑洞辐射的影响 显示英文标题

标题： Impact of trans-Planckian excitations on black-hole radiation in dipolar condensates

摘要： 我们考虑一个准一维的偶极凝聚体，在类比黑洞设置中。结果表明，凝聚体色散关系中的罗顿最小值会在霍金辐射谱上留下深刻印记。特别是，发射的辐射可能更强烈或被抑制，这取决于激发谱中罗顿最小值的深度。此外，我们发现即使去除了视界，也会发生自发粒子产生。我们的结果表明，偶极凝聚体提供了一个更丰富和更灵活的环境，用于模拟存在视界界面时从量子真空中产生的粒子，这比接触相互作用的对应物更为优越。 显示英文摘要

摘要： We consider a quasi-one-dimensional dipolar condensate in an analogue black hole setup. It is shown that the existence of a roton minimum in the condensate dispersion relation leaves deep imprints onto the Hawking radiation spectrum. In particular, the emitted radiation can be either more intense or suppressed, depending on the depth of the roton minimum in the excitation spectrum. In addition, we find that spontaneous particle creation occurs even when the horizon is removed. Our results establish that dipolar condensates offer a richer and more versatile environment for the simulation of particle production from the quantum vacuum in the presence of horizon-interfaces than their contact-interaction counterparts.