Almost a quarter of the universe stands literally in the shadows. According to cosmologists’ theories, 25.8% of it is made up of dark matter, whose presence is signaled essentially only by its gravitational pull. What this substance consists of remains a mystery. Hermann Nicolai, Director at the Max Planck Institute for Gravitational Physics in Potsdam, and his colleague Krzysztof Meissner from the University of Warsaw have now proposed a new candidate - a superheavy gravitino.

https://www.aei.mpg.de/2325660/dark-matter

Interesting stuff from the University of Warsaw. I wonder if this implies anything special about black holes?