The expanding Universe, full of galaxies and complex structure we see today, arose from a smaller, hotter, denser, more uniform state. Image credit: C. Faucher-Giguère, A. Lidz, and L. Hernquist, Science 319, 5859 (47).

Is the inflationary Universe a scientific theory? Not anymore

One of inflation’s cofounders has turned his back on the idea. But practically no one else is following him. Is he right?

This article was written by Sabine Hossenfelder. Sabine is a theoretical physicist specialized in quantum gravity and high energy physics. She also freelance…