Exotic solutions in string theory

TL;DR

This paper explores classical string theory solutions involving folds that lead to processes like string creation, recombination, and annihilation, highlighting their violations of standard physical conditions and their quantum counterparts.

Contribution

It introduces and analyzes classical string solutions with folds that violate positivity and Regge conditions, connecting them to quantum states with non-zero spurious components.

Findings

Solutions involve string creation, recombination, annihilation

Violations of mass positivity and Regge conditions identified

Quantum states correspond to these classical solutions with spurious components

Abstract

Solutions of classical string theory, correspondent to the world sheets, mapped in Minkowsky space with a fold, are considered. Typical processes for them are creation of strings from vacuum, their recombination and annihilation. These solutions violate positiveness of square of mass and Regge condition. In quantum string theory these solutions correspond to physical states |DDF>+|sp> with non-zero spurious component.