"Written about by several unrelated research groups and cited by _many_ unrelated research groups" would be a good start. This applies both to the concept of "process physics" itself, and to its viability as an explanation for dark matter, separately. Please see WP:UNDUE for additional information about weight, and WP:RS for a description of what sources are and aren't considered to have weight in a scientific context. Also please take a glance at WP:COI, as your first IP address suggests that you might have a vested interest in having PP prominently mentioned.