Dirac Observables for Gowdy Cosmologies regular at the Big Bang
This paper constructs an infinite set of off-shell, gauge-invariant Dirac observables for toroidal Gowdy cosmologies that remain regular at the Big Bang and systematically connect the full gravitational dynamics to a simpler Carroll-type theory via an anti-Newtonian expansion, thereby generalizing the Asymptotic Velocity Domination property.