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The four basic degrees of freedom of homogeneous INM are the
isoscalar scalar density
,
the isovector scalar density ,
the isoscalar
vector density *s*_{0}, and the isovector vector density *s*_{1}.
They can be expressed through the usual neutron and proton,
spin-up, and spin-down densities in the following way.

Similarly, densities of protons and neutrons
with spin up and down can be expressed as:

where
is the relative isospin excess,
is the relative spin excess, and
is the relative spin-isospin excess,
with
.
In symmetric unpolarized INM *I*_{i} = 0, while in asymmetric INM
.
Polarized INM has ,
and
spin-isospin polarized nuclear matter has .

** Next:** Fermi surfaces and kinetic
** Up:** Infinite Nuclear Matter
** Previous:** Introduction
*Jacek Dobaczewski*

*2002-03-15*