Let $\Gamma$ be a finite reductive group with defining characteristic $p$. We state a conjecture on the reduction modulo $p$ of unipotent (complex) representations of $\Gamma$.
Links:
[1] https://www.mpim-bonn.mpg.de/taxonomy/term/39
[2] https://www.mpim-bonn.mpg.de/node/3444
[3] https://www.mpim-bonn.mpg.de/node/8209