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One of the more challenging problems in cosmology is understanding the origin of galactic magnetic fields. Proposed seed mechanisms give large scale magnetic fields which are typically about 14 orders of magnitude weaker than currently observed. Moreover, observations at high redshift give no indication of systematically weaker galactic fields. This has led to a large number of proposals involving novel physics at very high temperatures and very early epochs in the universe. Here I will discuss progress in understanding large and small scale dynamo effects in highly conducting fluids. This leads to the prediction that galaxies will reach equipartition between disk turbulence and disordered magnetic fields within a few hundred million years. The long wavelength tail of these fields will be about 1.5 orders of magnitude below current values and should reach them within another few hundred million years.
Colloquia are usually preceded by coffee and followed by an informal reception (both in room CSS 0254). Anyone interested in having lunch or talking with the speaker should contact either of the colloquium coordinators (see below). The hour immediately after lunch will normally be reserved for the speaker to talk to graduate students. Students are urged to contact the coordinator to arrange this.
Request colloquia announcements by e-mail:
coll-request@astro.umd.edu
Colloquium Organizer:
Andrew Wilson (301) 405-1519
Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.
Parking for visitors is available in the Cashier-Attended Parking Lot at the intersection of Paint Branch & Technology Drive. It is a 5-10 minute walk from the parking lot to the Computer & Space Sciences building.
There are a limited number of parking meters in Lot DD; there are no parking meters in Parking Garage 2. Parking at non-metered spaces in Lot DD and PG2 is free after 4 pm and on weekends.
More information is available from the Department of Campus Parking.
Department of Astronomy, University of Maryland College Park, MD 20742-2421 Phone: (301) 405-3001 FAX: (301) 314-9067 Comments and questions may be directed to webmaster@astro.umd.edu
This page was automatically generated on:
20-Feb-2008.
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