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

TL;DR

This paper introduces extended actions for permutation-type orbifolds in string theory, revealing new twisted world-sheet gravities that suggest consistent higher central charge string models without negative-norm states.

Contribution

It constructs extended action formulations for permutation orbifolds at multiples of c=26, unveiling novel twisted world-sheet gravities and extended diffeomorphism groups.

Findings

Extended actions for orbifolds at c=26K are developed.

New twisted world-sheet gravities are identified.

Operator-string theories may be free of negative-norm states at higher central charge.

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.