Impact of inhomogeneous reionization on cosmic microwave background anisotropy

Lloyd Knox, Román Scoccimarro, Scott Dodelson

    Research output: Contribution to journalArticlepeer-review


    It is likely that the reionization of the Universe did not occur homogeneously. Using a model that associates ionized patches with overdense regions, we find that the resulting cosmic microwave background (CMB) anisotropy power spectrum peaks at angular scales corresponding to the extent of the ionized regions, and has a width that reflects the correlations between them. There is considerable uncertainty in the amplitude. Neglecting inhomogeneous reionization in the determination of cosmological parameters from high resolution CMB maps may cause significant systematic error.

    Original languageEnglish (US)
    Pages (from-to)2004-2007
    Number of pages4
    JournalPhysical Review Letters
    Issue number10
    StatePublished - Sep 7 1998

    ASJC Scopus subject areas

    • General Physics and Astronomy


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