Sharp changes in the density of a neutron star are literally ripping neutrino particles out of the vacuum of space.
April 29, 2026
Original Paper
Gradient-Produced Neutrinos
arXiv · 2604.21968
The Takeaway
Neutrinos are usually created by intense heat or nuclear reactions inside stars. This research identifies a new method where the sheer steepness of matter density creates a gradient effect that generates particle pairs. It is very similar to how intense electricity can pull matter from empty space. This process happens even when the star is relatively cool and stable. Knowing this helps astronomers better track the cooling cycles and lifespans of dead stars across the galaxy.
From the abstract
Sufficiently strong electric fields can produce charged-particle pairs via the Schwinger effect. We argue that steep matter-density gradients, as can arise in neutron star interiors, would analogously produce neutrino-antineutrino pairs. We then discuss observational signatures of these gradient-produced (anti)neutrinos and how they could provide new probes of neutron-star structure and baryon-dense QCD.