P. de Bernardis coauthored maps of cosmic microwave background temperature variations at four observing frequencies. Their angular power spectrum peaked near multipole , supporting a spatially flat cosmological model within the paper's cold dark matter interpretation.[ref]
A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation by P. de Bernardis and others. Author list and abstract, corresponding to Nature 404 (2000), pp. 955–959: four-frequency maps, peak multipole and qualified flat-universe interpretation.
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