# Eric Ling: Spacetime Extensions of the Big Bang

**Time: **
Tue 2019-10-15 11.00 - 12.00

**Lecturer: **
Eric Ling, KTH Royal Institute of Technology

**Location: ** Seminar Hall Kuskvillan, Institut Mittag-Leffler

### Abstract

n 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 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.