Air-shower muon puzzle
Cosmic-ray air showers produce more muons than standard collision models predict. Which particle-production physics explains the excess?
Astrophysics
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Common-envelope ejection
Two stellar cores can spiral through one shared envelope. What determines whether that gas escapes and how close the surviving binary becomes?
Fermi bubbles
Giant gamma-ray lobes rise above and below the Milky Way’s center. Their formation history and radiation mechanisms remain debated.
Gamma-ray burst prompt emission
The first flash of a long gamma-ray burst reveals an ultra-relativistic jet releasing energy. Which radiation processes produce the photons, and how do their contributions change during the burst?