UC Santa Cruz Physicist Applies Rigorous Test to Dark Matter Theories, Challenging Assumptions
Stefano Profumo, a professor of physics at the University of California, Santa Cruz, is employing a rigorous mathematical tool called the Barbieri-Giudice measure to assess the 'naturalness' of various dark matter candidates. This method quantifies how sensitive a model's predictions are to slight changes in its initial parameters, providing an objective standard for evaluating theories. Profumo's research challenges the long-held assumption that particle dark matter is inherently more 'natural' than other candidates, such as primordial black holes. His analysis of 12 scenarios revealed that some primordial black hole formations are as natural as the most robust particle models, while certain widely studied particle scenarios, like dark matter annihilation linked to the Higgs boson, were found to be highly 'fine-tuned,' requiring extremely precise parameter constraints. This work suggests that the naturalness of a dark matter candidate is determined by its mathematical structure, not its fundamental compos...
