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Hyperbolic universes with a horned topology and the cosmic microwave background anisotropy

Research output: Contribution to journalArticle

  • Ralf Aurich
  • Sven Lustig
  • Frank Steiner
  • Holger Then
Original languageEnglish
Pages (from-to)4901-4925
Number of pages25
JournalClassical and Quantum Gravity
Issue number21
Early online date7 Oct 2004
DateAccepted/In press - 2004
DateE-pub ahead of print - 7 Oct 2004
DatePublished (current) - 7 Nov 2004


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 paperis 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 asstated in the literature. On the other, 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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