The Statistical Significance of the "Dark Flow"
Ryan Keisler
TL;DR
This paper reevaluates the statistical evidence for the 'dark flow' phenomenon, finding no significant detection when accounting for correlations across multiple CMB channels, thus challenging previous claims of its existence.
Contribution
The study critically reassesses prior claims of dark flow detection by analyzing CMB data correlations, reducing the significance to statistically insignificant levels.
Findings
Dark flow detection significance reduced to 0.7σ
CMB channel correlations weaken previous evidence
No statistically significant bulk flow detected
Abstract
We revisit the statistical significance of the "dark flow" presented in Kashlinsky et al. (2009). We do not find a statistically significant detection of a bulk flow. Instead we find that CMB correlations between the 8 WMAP channels used in this analysis decrease the inferred significance of the detection to 0.7\sigma.
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