and the sum-rule enhancement factor,
are related to excitations and can be used as
pseudo-observables to compare with predictions of nuclear forces.
INM properties are also often used to adjust the parameters
of effective interactions for self-consistent calculations.
These properties at large asymmetry are key ingredients for
the description of neutron stars. (See, e.g., Refs. [23,69]
for a discussion on the mean-field level.)
Most papers deal with spin-saturated INM, in which the time-odd
channels of the interaction discussed here do not contribute.
Nothing is known about spin-polarized INM, which
actually may play some role in neutron stars.
A stability criterion for this exotic system, derived in
Ref. [70], was even used to adjust the parameters
of the SLyx forces in Ref.[23,24].
We do not consider tensor forces in this work. Their contribution
to the properties of polarized INM were explored, e.g., in
Ref. [71].