Lighting the Dark Ages

The visible universe has grown at least 1060 times larger since the Big Bang. Half of these would be accounted for by the hypothetical inflationary phase, a period of accelerated growth that happens in a eye-blink just after the Big Bang itself. The next 15 factors of...
Stellar Accelerations and Dark Matter

Stellar Accelerations and Dark Matter

For astronomers, looking at the sky can be like watching an unfamiliar sport on TV. We can’t make sense of what we see, but is it because we don’t know the rules, or that we can’t see all the players? (Or, worst case, we can’t see the players...
PyUltraLight

PyUltraLight

In the simplest models (and thus best-studied) models, gravity is the only interaction that plays a role in the overall astrophysical predictions of the dark matter. However, many models that have interesting connections to particle physics have more complicated...
Two-scale Oscillons

Two-scale Oscillons

Oscillons are spatially stationary, quasi-periodic solutions of nonlinear field theories. (Informal version: oscillons are what would happen if a stone was thrown into a pond and, rather than creating ripples, the water bounced up and down at the point...