Are nonperturbative AdS vacua possible in bosonic string theory?

Abstract

In this paper, following the work of Hohm and Zwiebach [arXiv:1905.06583], we show that in bosonic string theory nonperturbative anti-de Sitter (AdS) vacua could exist with all ${\alpha }^{\prime }$ corrections included. We also discuss the possibility of the coexistence of nonperturbative dS and AdS vacua.

V2: 14 pages, minor corrections, references added, published version, V3: typos corrected