The paper builds non-singular bouncing FLRW solutions in the O(d,d) invariant string cosmology action, but the higher-order coefficients are free inputs and the action consistency is unverified.
Are nonperturbative AdS vacua possible in bosonic string theory?
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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.
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Non-singular string cosmology via $\alpha^{\prime}$ corrections
The paper builds non-singular bouncing FLRW solutions in the O(d,d) invariant string cosmology action, but the higher-order coefficients are free inputs and the action consistency is unverified.