From the string vacuum to FLRW or de Sitter via ${\alpha }^{\prime }$ corrections

P. Conzinu, G. Fanizza, M. Gasperini +3

We first make more precise a recent "Hamiltonian" reformulation of the Hohm-Zwiebach approach to the tree-level, $O(d,d)$-invariant string cosmology equations at all orders in the…