Springer Tracts in Modern Physics Volume 194 Managing Editor: G. Höhler, Karlsruhe Editors: J. Kühn, Karlsruhe Th. Müller, Karlsruhe A. Ruckenstein, New Jersey F. Steiner, Ulm J. Trümper, Garching P. Wölfle, Karlsruhe Starting with Volume 165, Springer Tracts in Modern Physics is part of the [SpringerLink] service. For all customers with standing orders for Springer Tracts in Modern Physics we offer the full text in electronic form via [SpringerLink] free of charge. Please contact your librarian who can receive a password for free access to the full articles by registration at: springeronline.com If you do not have a standing order you can nevertheless browse online through the table of contents of the volumes and the abstracts of each article and perform a full text search. There you will also find more information about the series. 3 Berlin Heidelberg New York Hong Kong London Milan Paris Tokyo Springer Tracts in Modern Physics Springer Tracts in Modern Physics provides comprehensive and critical reviews of topics of current interest in physics. The following fields are emphasized: elementary particle physics, solid-state physics, complex systems, and fundamental astrophysics. Suitable reviews of other fields can also be accepted. The editors encourage prospective authors to correspond with them in advance of submitting an article. For reviews of topics belonging to the above mentioned fields, they should address the responsible editor, otherwise the managing editor. See also springeronline.com Managing Editor Solid-State Physics, Editors Gerhard Höhler Andrei Ruckenstein Editor for The Americas Institut für Theoretische Teilchenphysik Universität Karlsruhe Postfach 69 80 76128 Karlsruhe, Germany Phone: +49 (7 21) 6 08 33 75 Fax: +49 (7 21) 37 07 26 Email:
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[email protected] www.physics.rutgers.edu/people/pips/ Ruckenstein.html Johann H. Kühn Peter Wölfle Institut für Theoretische Teilchenphysik Universität Karlsruhe Postfach 69 80 76128 Karlsruhe, Germany Phone: +49 (7 21) 6 08 33 72 Fax: +49 (7 21) 37 07 26 Email:
[email protected] www-ttp.physik.uni-karlsruhe.de/∼jk Institut für Theorie der Kondensierten Materie Universität Karlsruhe Postfach 69 80 76128 Karlsruhe, Germany Phone: +49 (7 21) 6 08 35 90 Fax: +49 (7 21) 69 81 50 Email: