Two Double String Theory Actions: Non-Covariance vs. Covariance
arXiv:1503.01709
Abstract
The aim of this work is to achieve a formulation of the bosonic string theory in which T-duality appears as a manifest symmetry. Two models exhibiting this property are discussed. The first is based on the stringy extension of the Floreanini-Jackiw Lagrangians for chiral fields and is characterized by the loss of manifest covariance on the world-sheet, recovered on mass-shell. The second model exhibits two-dimensional covariance while doubling a priori the string coordinates in the target space. They are shown to be equivalent.
19 pages. Talk presented at the "2014 Corfu Summer Institute - Workshop on Quantum Fields and Strings" (Corfu -Greece, September 14-21 2014). Contribution to the proceedings. Typos fixed, minor changes, references added