Searching for stringy topologies in the cosmic microwave background

Assaf Ben-David*, Ben Rathaus, Nissan Itzhaki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We consider a universe with a non-classical stringy topology that has fixed points. We concentrate on the simplest example, an orbifold point, and study its observable imprints on the cosmic microwave background (CMB). We show that an orbifold preserves the Gaussian nature of the temperature fluctuations, yet modifies the angular correlation function. A direct signature of an orbifold is a single circle in the CMB that is invariant under rotation by 180°. Searching the 7-year ILC map of WMAP, we find one candidate circle with high statistical significance. However, a closer look reveals that the temperature profile does not fit an orbifold. We place a lower bound on the distance to an orbifold point at ∼ 85% of the distance to the surface of last scattering.

Original languageEnglish
Article number020
JournalJournal of Cosmology and Astroparticle Physics
Issue number11
StatePublished - Nov 2012


  • CMBR theory
  • cosmology of theories beyond the SM
  • string theory and cosmology


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