Tootfinder

My email address has been the same since 1992, when Ross Perot was in presidential debates with Bill Clinton and George H. W. Bush.
That does come with some challenges: desirable email can get overwhelmed within the constant firehose of unwanted email. (So if I've overlooked email from you, please don't hesitate to let me know!)
But overall I'm really glad to have had a stable address where people have been able to reach me for more than 32 years. I can't say that…

Effective Viscosity in the Intracluster Medium During Magnetic Field Amplification via Turbulent Dynamo
S. Adduci Faria, R. Santos-Lima, E. M. de Gouveia Dal Pino
https://arxiv.org/abs/2506.12221

Effective Viscosity in the Intracluster Medium During Magnetic Field Amplification via Turbulent Dynamo
Galaxy clusters host a hot, diffuse plasma with poorly understood viscosity and magnetic field amplification. Astrophysical plasmas are often modeled with magnetohydrodynamics (MHD), but low collision rates in environments like the intracluster medium (ICM) hinder thermodynamic equilibrium, causing pressure anisotropies and high viscosity. High-$β$ plasmas, dominated by thermal pressure, are prone to instabilities (e.g., firehose, mirror) that limit anisotropy, reduce viscosity, and enable sma…