Signs of extra neutron star and white drawf cooling.

Any light new boson coupling to matter, would lead to extra cooling of white drawfs and neutron stars. And this has been used to limit parameters of extra forces. Quanta Magazine, reports that signs of such cooling have been found . The most popular candidate is the one they mentioned the axion, but any boson might of low mass might be responseable.

Sterile Neutrino Oscillations Found at Baksan

Baksan Experiment on Sterile Transitions (BEST) https://arxiv.org/abs/2109.14654 found results pointing to a sterile neutrino, produced from oscillating electron neutrinos, squared mass difference 7.3 ev^2. The Axial force force predicts right handed neutrinos, (wouldn't be called sterile if they have another force), but not oscillation, but does predict conversion via scatterin so as would oscillation in matter would be predicted. I could not tell from the paper, weather they was a vacuum or material between the neutrino source.

CONUS Experiment probes nucleus neutrino non standard interactions.

CONUS yesterday, released results on non standard neutrino interactions, Arxiv link. As usual they ignore axial-vector interaction. But they can limit vector interaction to 5*10^-5 force constant for low (<1Mev) mass mediates. If that maps exactly to axial vector, its limits a new force constant to half as much i my estimate, 10^-4 of the new interaction strength. However axial vector interaction seems to be weaker as the neutrino energy increase. CONUS's neutrinos top out 1.8MeV. I need to take the time to calculate how much weaker the neutrino scattering is at these energies.