Giant rings in the cosmic microwave background sky

Ely D. Kovetz, Assaf Ben-David, Nissan Itzhaki

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


We find a unique direction in the cosmic microwave background sky around which giant rings have an anomalous mean temperature profile. This direction is in very close alignment with the afore measured anomalously large bulk flow direction. Using Monte Carlo simulations, we estimate the significance of the giant rings at the 3σ level and the alignment with the bulk flow at 2.5σ. We argue that a cosmic defect seeded by a pre-inflationary particle could explain the giant rings, the large bulk flow, and their alignment.

Original languageEnglish
Pages (from-to)374-378
Number of pages5
JournalAstrophysical Journal
Issue number1
StatePublished - 20 Nov 2010
Externally publishedYes


  • Cosmic background radiation
  • Early universe
  • Inflation
  • Large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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