The nature of ZZ branes

TL;DR

This paper demonstrates that in minimal non-critical string theory, all principal ZZ branes can be constructed from a fundamental (1,1) boundary state combined with (r,s) Cardy states, simplifying their classification.

Contribution

It reveals that all principal ZZ branes are derived from a single basic boundary state, unifying their description in minimal non-critical string theory.

Findings

All principal ZZ branes are tensor products of the (1,1) boundary state with (r,s) Cardy states.

There exists effectively only one fundamental ZZ boundary state.

The classification of ZZ branes can be reduced to the basic (1,1) state.

Abstract

In minimal non-critical string theory we show that the principal (r,s) ZZ brane can be viewed as the basic (1,1) ZZ boundary state tensored with the (r,s) Cardy boundary state. In this sense there exists only one ZZ boundary state, the basic (1,1) boundary state.