标题： 声黑洞辐射的光谱性质：扩展视界 显示英文标题

标题： Spectral properties of acoustic black hole radiation: Broadening the horizon

摘要： 在原子玻色凝聚体的背景下研究了引入短程色散时黑洞光谱的灵敏度。通过考虑由几个长度尺度表征的流，我们表明，尽管光谱仍然保持显著的普朗克特性，但温度不再由表面引力固定。相反，它由穿过视界的流梯度的平均值决定，该平均值在一个由愈合长度和表面引力固定的区间内计算，就像视界被加宽了一样。只要流动不会诱导产生振荡或通量的一些参数放大等非绝热效应，这种情况就仍然成立。 显示英文摘要

摘要： The sensitivity of the black hole spectrum when introducing short distance dispersion is studied in the context of atomic Bose condensates. By considering flows characterized by several length scales, we show that, while the spectrum remains remarkably Planckian, the temperature is no longer fixed by the surface gravity. Rather it is determined by the average of the flow gradient across the horizon over an interval fixed by the healing length and the surface gravity, as if the horizon were broadened. This remains valid as long as the flow does not induce nonadiabatic effects that produce oscillations or some parametric amplification of the flux.