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.
String cosmology: The Pre - big bang scenario,
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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.