Vorträge in der Woche 08.06.2020 bis 14.06.2020

Mittwoch, 10.06.2020: Spacetime Extensions of the Big Bang

Dr. Eric Ling (KTH Stockholm)

In this talk we show that a large class of k = -1 inflationary FLRW spacetimes dubbed 'Milne-like' admit continuous spacetime extensions through the big bang. For these spacetimes the big bang is a coordinate singularity analogous to how the r = 2m event horizon in Schwarzschild is a coordinate singularity. The geometry of the big bang coordinate singularity for Milne-like spacetimes is that of a lightcone in a spacetime conformal to Minkowski space where Lorentz invariance holds at the origin. We discuss how the mathematics of these spacetimes may help provide connections to certain problems in cosmology.