Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987tex..symp.....s&link_type=abstract
Presented at the Texas Symposium, Chicago, Ill., 14 Dec. 1986
Physics
Cosmology, Galactic Evolution, String Theory, Angular Momentum, Galaxies, Gravitational Fields, Rotation
Scientific paper
Successes and remaining problems with cosmic string theories of galaxy formation are outlined. Successes of the theory include predictions for the correct amplitude of initial inhomogeneities leading to galaxy formation, the distribution of observed inhomogeneities, the observed correlation function of clusters, and the density profiles of dark matter halos. Potentially serious problems which have been raised are the biased galaxy production (why do galaxies occur in clusters), the core radius problem (density profiles of galactic halos do not match predictions), the maximal rotation velocity problem (why is there a sharp cutoff in observed rotational velocity of galaxies), the small galaxy problem (why are all the galaxies relatively small structures), the angular momentum problem (where do baryons acquire their angular momentum in order to form spirals), and the large-scale structure problem (why do most galaxies appear to lie on surfaces surrounding voids). Possible approaches to each of these problems are suggested and the future of cosmic string theory is discussed.
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