Perspectives of TFD on String Theory

TL;DR

This paper explores the application of Thermo Field Dynamics to type IIB superstring theory in a pp wave background, proposing a finite temperature framework and interpreting the thermal vacuum as a string boundary state.

Contribution

It introduces a thermal Fock space and thermal vacuum as a boundary state, extending the BMN correspondence to finite temperatures within Thermo Field Dynamics.

Findings

Thermal Fock space constructed for superstring in pp wave background

Thermal vacuum identified as a string boundary state

Thermal torus interpretation generalized for closed bosonic strings

Abstract

Considering the type IIB superstring in a pp wave background some recent ideas and perspectives of Thermo Field Dynamics on string theory are presented. The thermal Fock space is constructed attempting to consider a possible finite temperature version of the BMN correspondence in this framework. Also, the thermal vacuum is identified as a string boundary state realizing the thermal torus interpretation in the ambit of Thermo Field Dynamics. Such a interpretation consists of a generalization of some recent analysis for the closed bosonic string.