Cosmic voids and induced hyperbolicity

TL;DR

This paper explores how cosmic voids exhibit hyperbolic properties affecting photon beams, revealing that anisotropy also influences hyperbolicity beyond underdensity and negative curvature effects.

Contribution

It demonstrates that hyperbolicity in cosmic voids is influenced by anisotropy of photon beams, expanding understanding beyond traditional negative curvature explanations.

Findings

Hyperbolicity depends on void underdensity and negative curvature.

Photon beam anisotropy affects hyperbolic behavior.

Results enhance understanding of light propagation in cosmic structures.

Abstract

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.