Speaker
Description
The idea of supernova remnants (SNRs) as Galactic PeVatrons is increasingly challenged by the lack of observational evidence, with current theory suggesting that only the most energetic SNRs in unusually dense environments can reach PeV energies. We approach this problem in two complementary ways. First, we rely on neutrinos as smoking-gun signatures of hadronic interactions and compile a theory-motivated catalog of the most promising Galactic SNRs for a stacking analysis with IceCube. Second, we use hybrid kinetic simulations with a faux-shock setup to probe the maximum energies achievable by CRs, finding that Emax(t) depends on both shock Mach number and transverse box size, and may involve physics beyond the Bell instability. Together, these two approaches help constrain the viability of SNRs as the sources of Galactic PeV cosmic rays.
