3 papers
hep-th2025
From the string vacuum to FLRW or de Sitter via 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, -invariant string cosmology equations at all orders in the…
hep-th2025
Non-singular pre-big bang scenarios from all-order corrections
M. Gasperini, G. Veneziano
We reformulate in Hamiltonian language the recent proposal by Hohm and Zwiebach of an action yielding the most general -symmetric string cosmology equations, at tree-level…
hep-th2024
The gravitational eikonal: from particle, string and brane collisions to black-hole encounters
Paolo Di Vecchia, Carlo Heissenberg, Rodolfo Russo +1
Motivated by conceptual problems in quantum theories of gravity, the gravitational eikonal approach, inspired by its electromagnetic predecessor, has been successfully applied to t…