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A D=4 N=1 Orbifold of Type I Strings

M. Berkooz, R. G. Leigh

Abstract

We consider the propagation of Type I open superstrings on orbifolds with four non-compact dimensions and $N=1$ supersymmetry. In this paper, we concentrate on a non-trivial Z_2xZ_2 example. We show that consistency conditions, arising from tadpole cancellation and algebraic sources, require the existence of three sets of Dirichlet 5-branes. We discuss fully the enhancements of the spectrum when these 5-branes intersect. An amusing attribute of these models is the importance of the tree-level (in Type I language) superpotential to the consistent relationship between Higgsing and the motions of 5-branes.

A D=4 N=1 Orbifold of Type I Strings

Abstract

We consider the propagation of Type I open superstrings on orbifolds with four non-compact dimensions and supersymmetry. In this paper, we concentrate on a non-trivial Z_2xZ_2 example. We show that consistency conditions, arising from tadpole cancellation and algebraic sources, require the existence of three sets of Dirichlet 5-branes. We discuss fully the enhancements of the spectrum when these 5-branes intersect. An amusing attribute of these models is the importance of the tree-level (in Type I language) superpotential to the consistent relationship between Higgsing and the motions of 5-branes.

Paper Structure

This paper contains 18 sections, 64 equations, 4 figures.

Table of Contents

  1. Introduction
  2. The Orientifold Group and the Spectrum
  3. Closed String Spectrum
  4. Open string states
  5. Worldsheet Consistency and Tadpole cancellation
  6. The Klein Bottle
  7. The Möbius Strip
  8. The Annulus
  9. The Full Tadpole
  10. Chan-Paton Representation of $\Omega,R_i$
  11. A definite choice
  12. The Spectrum
  13. 99-sector
  14. $5_i5_i$-sector
  15. $95$- and $55$-sectors
  16. ...and 3 more sections

Figures (4)

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