= Late-time CMB-matter cross correlation
Cross-correlating a cosmic microwave background <temperature> map with a low-redshift matter tracer can isolate a late gravitational contribution from the much larger primordial anisotropy. Decaying potential wells generally produce a positive correlation of matter overdensity with <temperature>. Tracer bias, overlapping redshift distributions, foreground emission, masks and chance correlations limit the inference. Potential evolution also depends on <curvature> and gravity assumptions, so this is not a dark-energy measurement independent of a cosmological model.
Back to article page
