Neutrino Flavor Changes May Explain Supernova Discrepancies

Supernova Model Inconsistencies

Current core-collapse supernova models, which describe how large stars collapse into neutron stars or black holes, have remained largely unchanged for decades. However, observational data on supernovae, such as their frequency and the types of progenitor stars, indicate that these models may be incomplete. There is a discrepancy between the rate of star formation and the observed frequency of supernovae, suggesting fewer supernovae occur than expected.

Black Hole Mass Gap

Further issues arise from observations of gravitational waves from black hole mergers, which reveal a 'mass gap' in black hole formation. This gap represents a range of masses where fewer black holes are observed than predicted by an even distribution. The exact conditions under which a neutron star becomes a black hole are not yet definitively understood, complicating this data.

Role of Neutrino Flavor Changes

A paper published in Physical Review D proposes that neutrino flavor changes could provide an explanation for these discrepancies. Neutrinos are crucial to supernova models, but existing models do not incorporate their ability to change identity, known as flavor oscillation. Incorporating this characteristic into supernova simulations may reconcile the theoretical models with observational data.