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- From: ethanb@ptolemy.astro.washington.edu (Ethan Bradford)
- Newsgroups: sci.astro
- Subject: Re: Dark matter
- Date: 24 Jan 93 23:12:46
- Organization: U. of Washington
- Lines: 17
- Message-ID: <ETHANB.93Jan24231246@ptolemy.astro.washington.edu>
- References: <24JAN199319274130@pavo.concordia.ca>
- NNTP-Posting-Host: ptolemy.astro.washington.edu
- In-reply-to: jt_rask@pavo.concordia.ca's message of 25 Jan 93 00:27:00 GMT
- TO: jt_rask@pavo.concordia.ca (RASKU, JASON T.)
-
- The only recent news w.r.t. dark matter that I know of was the
- conclusion that there was a lot more dark matter than previously
- thought in a small (3 galaxy) cluster. If the cluster is typical, the
- universe is definitely closed. The evidence for the dark matter is
- still indirect; in this case it is necessary to confine the hot gas in
- the cluster.
-
- There are active direct searches for two different promising
- candidates. Subatomic Weakly Interacting Massive Particles (WIMPs)
- are being searched for in accelerator results and in direct-detection
- experiments (trying to see the heat they deposit when they interact
- with very cold germanium). Star-sized MACHOs (MAssive Compact Halo
- Objects) are being probed by looking for lensing of stars in the
- Mageleanic Clouds. Both searches should have significant results in
- a few years -- either they will find something, or the possibility of
- that kind of dark matter will be somewhat constrained. My favorite
- candidate, massive neutrinos, wouldn't show up in these searches.
-