The Delta-Hole model at Finite Temperature
arXiv:nucl-th/9304005 · doi:10.1016/0375-9474(94)90713-7
Abstract
The spectral function of pions interacting with a gas of nucleons and Delta-33-resonances is investigated using the formalism of Thermo Field Dynamics. After a discussion of the zero Delta-width approximation at finite temperature, we take into account a constant width of the resonance. Apart from a full numerical calculation, we give analytical approximations to the pionic spectral function including such a width. They are found to be different from previous approximations, and require an increase of the effective Delta-width in hot compressed nuclear matter. The results are summarized in an effective dispersion relation for interacting pions.
34 pages in standard LaTeX GSI-preprint No. GSI-93-23
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