Determine the timescales for differential-rotation loss and neutrino escape

Determine the timescales governing the loss of differential rotation and the escape of neutrinos from remnants formed in binary neutron-star mergers or core-collapse supernovae, in order to establish which quasi-adiabatic evolutionary path the remnant follows.

Background

The proposed remnant-evolution scheme depends on the ordering of differential-rotation loss, neutrino escape, and cooling. Different orderings lead to distinct sequences of equilibrium configurations and can alter whether a remnant becomes a stable neutron star or collapses to a black hole.

The paper does not calculate these processes dynamically. It emphasizes that the relevant timescales are controlled by simultaneous physical mechanisms, including angular-momentum transport and neutrino interactions, and that the uncertainty is particularly significant for the loss of differential rotation.

References

Unfortunately, these timescales, particularly that governing the loss of differential rotation, remain poorly known due to the complexity of the simultaneous processes involved.

— Adiabatic evolution of hadronic neutron stars  (2610.13926 - Logoteta et al., 9 Oct 2026) in Section 5, subsection “Remnant evolution”