Abstract
We show that there exists a nontrivial contribution on the Witten covariant phase space when the Gauss–Bonnet topological term is added to the Dirac–Nambu–Goto action describing strings, because the geometry of deformations is modified, and on such space we construct a symplectic structure. Future extensions of the present results are outlined.
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Escalante, A. Deformation Dynamics and the Gauss–Bonnet Topological Term in String Theory. International Journal of Theoretical Physics 43, 1491–1502 (2004). https://doi.org/10.1023/B:IJTP.0000048633.32391.fd
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DOI: https://doi.org/10.1023/B:IJTP.0000048633.32391.fd