A Tour through N = 2 Strings
Abstract
I give an overview of open, closed and heterotic N=2 strings. At the tree level I derive the effective field theories of all the strings, and discuss the group theory of the N=2 open string and the interaction between its open and closed sectors. At one loop N=2 string loop amplitudes and partition functions have incurable infra-red divergences, and show puzzling disagreements on the dimension of spacetime when compared to their effective field theories. I show that the closed-string three-point amplitude can be written directly in terms of a Schwinger parameter, so explicitly exhibiting the inconsistency. I finally discuss the possibility that the puzzles posed by the loop amplitudes could be solved if the N=2 theories were Lorentz invariant and supersymmetric, and I speculate on possible modifications of the string calculations.
- Publication:
-
String Theory, Quantum Gravity, and the Unification of the Fundamental Interactions
- Pub Date:
- 1993
- DOI:
- 10.48550/arXiv.hep-th/9211059
- arXiv:
- arXiv:hep-th/9211059
- Bibcode:
- 1993stqu.conf..391M
- Keywords:
-
- High Energy Physics - Theory
- E-Print:
- 24 Pages (LaTeX) (Revision: History updated, reference fixed.), Rome String Theory Workshop 1992 (Talk presented at the Rome conference on ``String theory, quantum gravity and the unification of fundamental interactions'', Sept 1992.)