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5 papers · 2 filters
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…
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…
Asymptotic symmetry algebra of Einstein gravity and Lorentz generators
Oscar Fuentealba, Marc Henneaux, Cédric Troessaert
The asymptotic symmetry algebra of four-dimensional Einstein gravity in the asymptotically flat context has been shown recently to be the direct sum of the Poincaré algebra and of…
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…
A note on the asymptotic symmetries of electromagnetism
Oscar Fuentealba, Marc Henneaux, Cédric Troessaert
We extend the asymptotic symmetries of electromagnetism in order to consistently include angle-dependent gauge transformations that involve terms growing at spatial infi…