Hyperbolic Universes with a Horned Topology and the CMB Anisotropy

Details Hyperbolic Universes with a Horned Topology and the CMB Anisotropy Hyperbolic Universes with a Horned Topology and the CMB Anisotropy

2004-03-25

arxiv.org/abs/astro-ph/0403597v2

Class.Quant.Grav. 21 (2004) 4901-4926

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1088/0264-9381/21/21/010

We analyse the anisotropy of the cosmic microwave background (CMB) in hyperbolic universes possessing a non-trivial topology with a fundamental cell having an infinitely long horn. The aim of this paper is twofold. On the one hand, we show that the horned topology does not lead to a flat spot in the CMB sky maps in the direction of the horn as stated in the literature. On the other hand, we demonstrate that a horned topology having a finite volume could explain the suppression of the lower multipoles in the CMB anisotropy as observed by COBE and WMAP.

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