Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Nukleare Astrophysik II

HK 25.4: Vortrag

Dienstag, 22. März 2011, 17:30–17:45, HS3

Response functions of superfluid neutron matter — •Jochen Keller and Armen Sedrakian — Institut für Theoretische Physik, Goethe Universität Frankfurt/Main, 60438 Frankfurt/Main

We investigate the response of pair-correlated neutron matter under conditions relevant to neutron stars to external weak probes and compute its neutrino emissivity in vector and axialvector channels. To derive the response functions we sum up an infinite chain of particle-hole ladder diagrams within finite-temperature Green's function theory. The polarization tensor of matter is evaluated in the limit of small momentum transfers. The calculated neutrino emission via the weak neutral current processes of pair-breaking and recombination of Cooper-pairs in neutron stars causes a cooling of their baryonic interior, and represents an important mechanism for the thermal evolution of the star within a certain time domain.