Neutrino Intensity Interferometry: Measuring Proto-neutron Star Radii During Core-Collapse Supernovae

Intensity interferometry is a technique that has been used to measure the size of sources ranging from the quark-gluon plasma formed in heavy ion collisions to the radii of stars. We investigate using the same technique to measure proto-neutron star (PNS) radii with the neutrino signal received from a core-collapse supernovae. Using a full wave-packet analysis, including the neutrino mass for the first time, we derive criteria where the effect can be expected to provide the desired signal, and find that neutrinos from the next Galactic supernova should contain extractable PNS radius information.
Comment: 5 pages, 3 figures, 1 ancillary file of derivations. Version updated to match PRL publication