Abstract
The speed of sound is calculated in both symmetric nuclear matter and neutron matter through equations of state using the finite-range effective interaction SEI suggested by Satpathy and collaborators. It is found that in symmetric nuclear matter, the speed of sound becomes superluminous far beyond the normal nuclear matter density π 0 for two given temperatures with internal energies of 100 and 200 MeV, unlike the Skyrme force (SK-III) where superluminosity occurs at density ∼ π 0. In neutron matter, the occurrence of superluminosity is further shifted from the region of the normal nuclear-matter density. These observations confirm the suitability of SEI for calculating properties of nuclei at finite temperatures and hence there is no need to either readjust the interaction parameters or to make them density dependent.
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