The Orbifolds of Permutation-Type as Physical String Systems at Multiples of c=26. I.Extended Actions and New Twisted World-Sheet Gravities

Abstract

This is the first in a series of papers in which I investigate the orbifolds of permutation-type as candidates for {\it new physical string systems} at multiples of critical closed-string central charges. Examples include the bosonic orientation orbifolds, the bosonic permutation orbifolds and others, as well as superstring extensions. In this paper I use the extended (twisted) Virasoro algebras of these orbifolds to construct the corresponding extended action formulations of the twisted open- and closed-string sectors of all the bosonic orbifolds at $\hatc=26K$. The extended actions exhibit a large set of {\it new twisted world-sheet gravities}, whose extended diffeomorphism groups clearly indicate that the associated operator-string theories can be free of negative- norm states at higher central charge.

54 pages

References in corpus (7)

• Matrix factorisations and permutation branes
• Permutation branes and linear matrix factorisations
• Generalised permutation branes
• The General Twisted Open WZW String
• Twisted boundary states and representation of generalized fusion algebra
• Matrix model eigenvalue integrals and twist fields in the su(2)-WZW model
• Level-rank duality of untwisted and twisted D-branes

Cited by in corpus (5)

• Diagrams for Symmetric Product Orbifolds
• The Orbifolds of Permutation-Type as Physical String Systems at Multiples of c=26 IV. Orientation Orbifolds Include Orientifolds
• The Orbifolds of Permutation-Type as Physical String Systems at Multiples of $c=26$ III. The Spectra of $\hat{c}=52$ Strings
• The Orbifold-String Theories of Permutation-Type: I. One Twisted BRST per Cycle per Sector
• DLCQ Strings, Twist Fields and One-Loop Correlators on a Permutation Orbifold