Quantum field theories on null surfaces

Authors
Citation
Ks. Gupta et B. Ydri, Quantum field theories on null surfaces, INT J MOD P, 16(10), 2001, pp. 1789-1808
Citations number
13
Categorie Soggetti
Physics
Journal title
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
ISSN journal
0217751X → ACNP
Volume
16
Issue
10
Year of publication
2001
Pages
1789 - 1808
Database
ISI
SICI code
0217-751X(20010420)16:10<1789:QFTONS>2.0.ZU;2-T
Abstract
We study the behavior of quantum field theories defined on a surface S as i t tends to a null surface S-n. In the case of a real, free scalar field the ory the above limiting procedure reduces the system to one with a finite nu mber of degrees of freedom. This system is shown to admit a one parameter f amily of inequivalent quantizations. A duality symmetry present in the mode l can be used to remove the quantum ambiguity at the self-dual point. In th e case of the nonlinear sigma -model with the Wess-Zumino-Witten term a sim ilar limiting behavior is obtained. The quantization ambiguity in this case however cannot be removed by any means.