By assuming that only gravitation exists between dark matter (DM) and normal
matter (NM), we study the effects of fermionic DM on the properties of neutron
stars using the two-fluid Tolman-Oppenheimer-Volkoff formalism. It is found
that the mass-radius relationship of the DM admixed neutron stars (DANSs)
depends sensitively on the mass of DM candidates, the amount of DM, and
interactions among DM candidates. The existence of DM in DANSs results in a
spread of mass-radius relationships that cannot be interpreted with a unique
equilibrium sequence. In some cases, the DM distribution can surpass the NM
distribution to form DM halo. In particular, it is favorable to form an
explicit DM halo, provided the repulsion of DM exists. It is interesting to
find that the difference in particle number density distributions in DANSs and
consequently in star radii caused by various density dependencies of nuclear
symmetry energy tends to disappear as long as the repulsion of accumulated DM
is sufficient. These phenomena indicate that the admixture of DM in neutron
stars can significantly affect the astrophysical extraction of nuclear equation
of state by virtue of neutron star measurements. In addition, the effect of the
DM admixture on the star maximum mass is also investigated.Comment: to be published in Phys. Rev. C (2014
We study the impact of fermionic dark matter (DM) on projected Higgs precision measurements at the Circular Electron Positron Collider (CEPC), including the one-loop effects on the e þ e − → Zh cross section and the Higgs boson diphoton decay, as well as the tree-level effects on the Higgs boson invisible decay. As illuminating examples, we discuss two UV-complete DM models, whose dark sector contains electroweak multiplets that interact with the Higgs boson via Yukawa couplings. The CEPC sensitivity to these models and current constraints from DM detection and collider experiments are investigated. We find that there exist some parameter regions where the Higgs measurements at the CEPC will be complementary to current DM searches.
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