3,879 research outputs found
Index Theory, Gerbes, and Hamiltonian Quantization
We give an Atiyah-Patodi-Singer index theory construction of the bundle of
fermionic Fock spaces parametrized by vector potentials in odd space dimensions
and prove that this leads in a simple manner to the known Schwinger terms
(Faddeev-Mickelsson cocycle) for the gauge group action. We relate the APS
construction to the bundle gerbe approach discussed recently by Carey and
Murray, including an explicit computation of the Dixmier-Douady class. An
advantage of our method is that it can be applied whenever one has a form of
the APS theorem at hand, as in the case of fermions in an external
gravitational field.Comment: 16 pages, Plain TeX inputting AMSTe
Interview with Carey A. Moore, December 30, 2003
Carey A. Moore was interviewed on December 30, 2003 by Michael Birkner about his experiences after leaving Gettysburg College and moving on ultimately toward a Ph.D and then a teaching career.
Length of Interview: 94 minutes
Collection Note: This oral history was selected from the Oral History Collection maintained by Special Collections & College Archives. Transcripts are available for browsing in the Special Collections Reading Room, 4th floor, Musselman Library. GettDigital contains the complete listing of oral histories done from 1978 to the present. To view this list and to access selected digital versions please visit -- http://gettysburg.cdmhost.com/cdm/landingpage/collection/p16274coll
Orthogonal multiplexing techniques for switching in a digital local telephone exchange
Imperial Users onl
Principal Bundles and the Dixmier Douady Class
A systematic consideration of the problem of the reduction and extension of
the structure group of a principal bundle is made and a variety of techniques
in each case are explored and related to one another. We apply these to the
study of the Dixmier-Douady class in various contexts including string
structures, U-res bundles and other examples motivated by considerations from
quantum field theory.Comment: 28 pages, latex, no figures, uses amsmath, amsthm, amsfonts. Revised
version - only change a lot of irritating typos remove
The caloron correspondence and higher string classes for loop groups
We review the caloron correspondence between -bundles on
and -bundles on , where is the space of smooth loops in
the compact Lie group . We use the caloron correspondence to define
characteristic classes for -bundles, called string classes, by
transgression of characteristic classes of -bundles. These generalise the
string class of Killingback to higher dimensional cohomology.Comment: 21 pages. Author addresses adde
The basic bundle gerbe on unitary groups
We consider the construction of the basic bundle gerbe on SU(n) introduced by
Meinrenken and show that it extends to a range of groups with unitary actions
on a Hilbert space including U(n), diagonal tori and the Banach Lie group of
unitary operators differing from the identity by an element of a Schatten
ideal. In all these cases we give an explicit connection and curving on the
basic bundle gerbe and calculate the real Dixmier-Douady class. Extensive use
is made of the holomorphic functional calculus for operators on a Hilbert
space
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