1998/11/16 by R. Parthasarathy, K. S. Viswanathan
Physics and Astronomy · #hep-th
published as Lett.Math.Phys. 48 (1999) 243-250 · 9 pages
arxiv created 1998/11/16 · arxiv updated 2009/11/30
From the Dirac action on the world sheet, an effective action is obtained by integrating over the 4-dimensional fermion fields pulled back to the world sheet. This action consists of the Nambu-Goto area term with right dimensionful constant in front, extrinsic curvature action and the topological Euler characteristic term.