The ZZ annulus one-point function in non-critical string theory: A string field theory analysis

Abstract

We compute the ZZ annulus one-point function of the cosmological constant operator in non-critical string theory, regulating divergences from the boundaries of moduli space using string field theory. We identify a subtle issue in a previous analysis of these divergences, which was done in the context of the c = 1 string theory, and where it had led to a mismatch with the prediction from the dual matrix quantum mechanics. After fixing this issue, we find a precise match to the expected answer in both the c < 1 and c = 1 cases. We also compute the disk two-point function, which is a quantity of the same order, and show that it too matches with the general prediction.