Abstract
The equation of state for neutron matter in the presence of a pion condensate is investigated at finite, but small temperature within the σ model. It is found that a transition of van der Waals type takes place at low temperature for sufficiently strong effective p-wave interaction, which disappears however beyond a critical temperature T c. Within a wide variety of model assumptions, an upper limit of about 50 MeV is found for T c.
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