Emission of fermions in little string theory

TL;DR

This paper investigates fermion emission from little string theory black holes, extending previous scalar field studies, and finds that the thermal emission characteristics are consistent across different particle types, impacting the understanding of information loss.

Contribution

It extends the analysis of black hole radiation in LST to fermions, calculating emission probability, flux, and greybody factors for fermionic fields.

Findings

Fermion emission in LST black holes is consistent with scalar emission results.

The emission spectrum remains thermal and uncorrelated, supporting the information loss hypothesis.

Calculated greybody factors for fermions in LST background.

Abstract

It is well-known that little string theory (LST) black holes radiate a purely thermal spectrum of scalar particles. This theory lives in a Hagedorn phase with a fixed Hagedorn temperature that does not depend on its mass. Therefore, the theory keeps a thermal profile even taking into account self-gravitating effects and the back-reaction of the metric. This has implications concerning the information loss paradox; one would not be able to recover any information from the LST black hole since the emission of scalar particles is totally uncorrelated. Several studies of the emission spectrum in LST concern scalar fields; it is our aim in this work to extend the study to the emission of fermions in order to verify that the most relevant conclusion for the scalar field remains valid for the fermions fields. Thus, we have calculated the emission probability, the flux, and also the greybody factor corresponding to a fermion field in LST background.