Measurements of the early universe show that space appears flat across the observable cosmos. But beyond our horizon, the universe could still curve, loop, or connect in surprising ways, leaving its ...

We point out a new phenomenon which seems to be generic in 4d effective theories of scalar fields coupled to Einstein gravity, when applied to cosmology. A lift of such theories to a Weyl-invariant ...

Last year, cosmologists working on the Dark Energy Spectroscopic Instrument (DESI) reported hints that the mysterious dark energy thought to be driving the expansion of the universe may be weakening ...

This event was recorded on February 25, 2026 at Flug Forum, produced by Aspen Center for Physics, in partnership with Aspen Public Radio. A hundred years ago, we did not know what atoms were really ...