Large--Scale Angular Correlations in CDM Models

We generate artificial Lick maps using $N$–body simulations and compare the angular correlation function, $w(\vartheta )$, measured from the simulations with the APM correlation. For the Gaussian CDM model, neither the standard biassed model nor a more evolved model (as suggested by the COBE data), reproduce the correlations on large angular scales. We come to a similar conclusion about CDM models with positively skewed initial fluctuation distributions. In contrast, models with initially negatively skewed fluctuations produce a $w(\vartheta )$ that declines much more gently on large scales. Such models are therefore in principle capable of reconciling the lack of large–scale power of the CDM spectrum with the observed clustering of APM galaxies.