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Pastimes : IT CAME FROM OUTER SPACE -- Ignore unavailable to you. Want to Upgrade?

To: kinkblot who wrote (338)	11/21/2000 12:46:53 AM
From: Volsi Mimir	Respond to of 480

The Flow Chart that explains EVERYTHING: (well, maybe not like Stephan Wolfram) cfpa.berkeley.edu -------------------------------------------------- Dark Matter zebu.uoregon.edu 4) Large scale structure (e.g. the distribution of galaxies) is very hard to understand, particularly in light of the relatively smooth microwave background as measured by the COBE satellite. There is way too much power on large scales. One way to accomodate this is to go to a mixed dark matter model in which you have some hot dark matter (for the large scale power) and some cold dark matter (wimps, axions, photinos, supersymmetric particles, etc) to act as a seed for galaxy formation. None of those models, however, fit the data using the critical density. The best models to date (you can see a diagram in the http document referenced above) suggest mixed dark matter and an overall cosmological mass density of 20-30% of closure. Hence, to retain inflation, with its inescapable prediction that the Universe must be flat, requires re-invoking Einstein's cosmological constant - meaning the universe has vacuum energy (negative pressure) and is currently accelerating. This makes our cosmology complicated but much data is pointing this way. 5) Finally, there have been speculative papers that if the dark matter is really something toally new and mysterious then maybe it communicates with itself over some long range force (either attractive or repulsive). An intriguing idea as that would mess up all the comoslogical dynamics - but given the really surprising nature of the galaxy distribution - something clearly very funny is going on. from Dr.greg Bothun's University of Oregon site: zebu.uoregon.edu