J. Pando et al., EVIDENCE FOR SCALE-SCALE CORRELATIONS IN THE COSMIC MICROWAVE BACKGROUND-RADIATION, Physical review letters, 81(21), 1998, pp. 4568-4571
We perform a discrete wavelet analysis of the Cosmic Background Explor
er differential microwave radiometer (DMR) 4-yr sky maps and find a si
gnificant scale-scale correlation on angular scales from about 11 degr
ees to 22 degrees, only in the DMR face centered on the north galactic
pole. This non-Gaussian signature does not arise either from the know
n foregrounds or the correlated noise maps, nor is it consistent with
upper limits an the residual systematic errors in the DMR maps. Either
the scale-scale correlations are caused by an unknown foreground cont
aminate or systematic errors on angular scales as large as 22 degrees,
or the standard inflation plus cold dark matter paradigm is ruled out
at the >99% confidence level. [S0031-9007(98)07712-6].