A MORPHOLOGICAL INDICATOR FOR COMPARING SIMULATED COSMOLOGICAL SCENARIOS WITH OBSERVATIONS

We propose a morphological multi-scale analysis of large scale structu res obtained by computer simulations and by observations. Structures a re obtained at different scales by applying a wavelet transform on the observed and simulated data. Application of a segmentation algorithm allows a quantitative morphological description of the structures at e ach scale. The morphological parameter which we propose represents the deviation of a structure from sphericity. The dependence on scale of this simple parameter is shown to characterize, in simulations, the un derlying cosmological model. We compare the HDM, CDM and mixed models with the CfA catalogue. This comparison favours a mixed model containi ng 65% of CDM, 30% of HDM, and 5% of baryonic matter.