Abstract
The momentum dependence of the nuclear matter isovector symmetry energy coefficient [Formula: see text] is presented in the framework of the nuclear matter polarizability with Skyrme interactions, as worked out in Refs. 1, 2. A slightly more complete account is presented for the spin-isovector symmetry energy [Formula: see text] as function of the temperature and momentum exchange and it is found to have a quite similar behavior to the isovector one [Formula: see text]. The variation of [Formula: see text] with temperature is quite soft and decreasing whereas the dependence on exchanged momentum can make [Formula: see text] to be close to zero, although it does not reach negative values.
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