| Citation | Davies has made major contributions to our understanding of the large scale structure of the Universe. His studies of the line emission from neutral hydrogen in samples of galaxies to redshifts of 6000 km s^-1 have given important data about departures from the smooth Hubble flow. His spectral measurements of the cosmic microwave background (CMB) show that on the 5 to 8 degree angular scale the background is smooth at least to a level of delta-T/T = 2*10^-5 and that any detectable fluctuations are galactic in origin. On the arc-minute angular scale he has shown that the CMB is smooth to a level of delta-T/T = 6*10^-5. These results on the Hubble flow and CMB place critical constraints on the theories of galaxy formation in the evolving Universe. Davies is also well known for his pioneering research on the hydrogen line emission which has had an important bearing on the understanding of the magnetic field structure and tidal processes in galaxies. He made the first long baseline interferometer studies of the line emission from the hydroxyl radical which revealed that the brightness temperature was 10^12 to 10^14K thereby stimulating the belief that maser processes were operative in the galactic hydroxyl clouds. |