标题： 宇宙空洞和诱导的双曲性 显示英文标题

标题： Cosmic voids and induced hyperbolicity

摘要： 宇宙空洞——宇宙中低密度区域——作为大尺度物质分布的特征，以其双曲特性而闻名。 后者意味着由于其低密度导致光子束的偏转，从而模拟了负曲率。 我们现在表明，双曲性不仅由负曲率或低密度引起，还取决于光子束的各向异性。 显示英文摘要

摘要： Cosmic voids - the low density regions in the Universe - as characteristic features of the large scale matter distribution, are known for their hyperbolic properties. The latter implies the deviation of photon beams due to their underdensity, thus mimicing the negative curvature. We now show that the hyperbolicity can be induced not only by negative curvature or underdensity but also depends on the anisotropy of the photon beams.