| DATE: |
2006-12-19 11:00 - 12:00 |
| PLACE: |
Kenkyu Honkan 2F RM 220 |
| TITLE: |
New Covariant Gauges in String Field Theory and Tachyon Potential |
| CONTACT: |
tsuda |
| SPEAKER: |
Mitsuhiro Kato (University of Tokyo) |
| LANGUAGE: |
Japanese |
| ABSTRACT: |
A single-parameter family of covariant gauge fixing conditions in bosonic string field theory is proposed. It is a natural string field counterpart of the covariant gauge in the conventional gauge theory, which includes the Landau gauge as well as the Feynman (Siegel) gauge as special cases. The action in the Landau-type gauge is largely simplified in such a way that numerous component fields have no derivatives in their kinetic terms and appear in at most quadratic in the vertex. Then new gauges are applied to the level truncated analysis of tachyon condensation. It is found that the only one real non-trivial extremum persists to appear in the well-defined region of the gauge parameter, while the other solutions are turned out to be gauge-artifacts. Contrary to the previously known pathology in the Feynman-Siegel gauge, tachyon potential is remarkably smooth enough around Landau-type gauge.
Refs: M. Asano and M. Kato, hep-th/0611189, hep-th/0611190.
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