Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-23
Nucl.Phys. A720 (2003) 189-206
Astronomy and Astrophysics
Astrophysics
19 pages, 8 figures, elsart class
Scientific paper
10.1016/S0375-9474(03)00748-6
The cooling of neutron stars by URCA processes in the kaon-condensed neutron star matter for various forms of nuclear symmetry energy is investigated. The kaon-nucleon interactions are described by a chiral lagrangian. Nuclear matter energy is parametrized in terms of the isoscalar contribution and the nuclear symmetry energy in the isovector sector. High density behaviour of nuclear symmetry energy plays an essential role in determining the composition of the kaon-condensed neutron star matter which in turn affects the cooling properties. We find that the symmetry energy which decreases at higher densities makes the kaon-condensed neutron star matter fully protonized. This effect inhibits strongly direct URCA processes resulting in slower cooling of neutron stars as only kaon-induced URCA cycles are present. In contrast, for increasing symmetry energy direct URCA processes are allowed in the almost whole density range where the kaon condensation exists.
Kubis Sebastian
Kutschera Marek
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