Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9211946s&link_type=abstract
Presented at the Second International Symposium on Particles, Strings, and Cosmology, Boston, MA, Mar. 1991
Astronomy and Astrophysics
Astrophysics
Astrophysics, Baryons, Cosmology, Galactic Clusters, Galactic Evolution, Galactic Structure, Universe, Background Radiation, Isotropy, Microwaves
Scientific paper
A summary of the current forefront problem of physical cosmology, the formation of structures (galaxies, clusters, great walls, etc.) in the universe is presented. Solutions require two key ingredients: (1) matter; and (2) seeds. Regarding the matter, it now seems clear that both baryonic and non-baryonic matter are required. Whether the non-baryonic matter is hot or cold depends on the choice of seeds. Regarding the seeds, both density fluctuations and topological defects are discussed. The combination of isotropy of the microwave background and the recent observations indicating more power on large scales have severly constrained, if not eliminated, Gaussian fluctuations with equal power on all scales, regardless of the eventual resolution of both the matter and seed questions. It is important to note that all current structure formation ideas require new physics beyond SU(3) x SU(2) x U(1).
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