スピーカー：藤原 素子 (東大本郷==>ミュンヘン工科大学)

タイトル：Capture of Electroweak Multiplet Dark Matter in Neutron Stars

アブストラクト：
If Dark Matter (DM) has a sizable scattering cross section with nucleons,
it can efficiently be captured by a neutron star. Its energy is then
transferred to the neutron star as heat through the scattering and
annihilation inside the star. This heating effect may be detectable via
dedicated temperature observations of nearby old pulsars, providing an
alternative method for DM searches. We show that, for electroweak multiplet
DM, this search strategy can probe the parameter region that is out of
reach of future DM direct detection experiments. To see this
systematically, we classify such DM candidates in terms of their
electroweak charges and investigate the effect of ultraviolet physics using
higher-dimensional effective operators. We then show that if the effect of
ultraviolet physics is sizable, the DM-nucleon elastic scattering cross
section becomes sufficiently large, whilst if it is suppressed, then the
mass splittings among the components of the DM multiplet get small enough
so that the inelastic scattering processes are operative. In any case, the
electroweak multiplet DM particles are efficiently captured in neutron
stars, making the search strategy with the temperature observation of old
neutron stars promising.