In Figure 34 this EoS is compared with the SLy model of cold catalyzed matter described in
Section 5.1. At
both EoSs are very similar. The reason is that for
, as discussed in
Section 3.1, we have
with
and the ratio
is quite similar for both
accreted and ground state crusts. Large differences appear for
, where the EoS of
accreted matter is stiffer than that of cold catalyzed matter. One also notices well-pronounced density
jumps at constant pressure in the EoS of accreted matter. They are associated with discontinuous changes
in nuclear composition, an artifact of the one-component plasma approximation. The jumps are particularly
large for
.
The difference between the cold catalyzed and accreted matter EoSs decreases for large density. Both
curves are very close to each other for . This is because for such a high density the
pressure is mainly produced by the neutron gas and is not sensitive to the detailed composition of the
nuclear clusters. In view of this, one can use the EoS of the catalyzed matter for calculating the
hydrostatic equilibrium of the high-density (
) internal layer of the accreted
crust.
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