Black holes come in many different sizes. But is there a mass limit? The authors of today’s paper investigate the possibility of black holes a trillion times as massive as the sun. Surprisingly, they could also help explain the mysterious dark matter!
The Hubble tension is one of the biggest issues in modern cosmology. Why can we not agree on the expansion rate of the Universe? Today’s authors propose a solution: The actual disagreement might be in the assumed mean temperature of the cosmic microwave background.
Modern cosmology relies on large numerical simulations. However, creating them requires a lot of memory and computational time. Today’s paper describes a technique that can dramatically decrease the computational cost of simulations – by focusing on the most important parts of the simulation and reducing waste!
Interstellar travel is difficult with traditional fuel-powered rockets. Today’s paper explores how we could instead use sailing space ships, propelled by photons and particles from astrophysical sources. Spoiler alert: Sailing ships could almost reach the speed of light!
The Hubble constant describes the rate at which the universe expands. But different measurements of it yield different results – a problem for the cosmic standard model. Today’s paper discusses new Cepheid observations, which increase the problem – so, are we on the brink of new physics?