Robert Crittenden co-authored an analysis of the cross-correlation between cosmic microwave background maps from WMAP and cosmic X-ray background maps from HEAO 1. Such a comparison tests whether angular variations measured in different radiation bands share a physical origin.
The paper examined possible foreground explanations for the correlation before interpreting it as evidence consistent with the Integrated Sachs-Wolfe effect. This is an example of testing a cosmological signal through independently measured maps and explicit alternative sources of correlation.[ref]
Investigating the origins of the CMB-XRB cross correlation by Stephen Boughn and Robert Crittenden. Abstract: WMAP/HEAO1 cross-correlation and tests of foreground origins
Portrait of Robert Crittenden
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