Lopes, Ilidio and Silk, Joseph (2012), "SOLAR CONSTRAINTS ON ASYMMETRIC DARK MATTER", ASTROPHYSICAL JOURNAL, 757, 2.
Abstract: The dark matter content of the universe is likely to be a mixture of
matter and antimatter, perhaps comparable to the measured asymmetric
mixture of baryons and antibaryons. During the early stages of the
universe, the dark matter particles are produced in a process similar to
baryogenesis, and dark matter freezeout depends on the dark matter
asymmetry and the annihilation cross section (s-wave and p-wave
annihilation channels) of particles and antiparticles. In these
eta-parameterized asymmetric dark matter (eta ADM) models, the dark
matter particles have an annihilation cross section close to the weak
interaction cross section, and a value of dark matter asymmetry eta
close to the baryon asymmetry eta(B). Furthermore, we assume that dark
matter scattering of baryons, namely, the spin-independent scattering
cross section, is of the same order as the range of values suggested by
several theoretical particle physics models used to explain the current
unexplained events reported in the DAMA/LIBRA, CoGeNT, and CRESST
experiments. Here, we constrain eta ADM by investigating the impact of
such a type of dark matter on the evolution of the Sun, namely, the flux
of solar neutrinos and helioseismology. We find that dark matter
particles with a mass smaller than 15 GeV, a spin-independent scattering
cross section on baryons of the order of a picobarn, and an
eta-asymmetry with a value in the interval 10(-12)-10(-10), would induce
a change in solar neutrino fluxes in disagreement with current neutrino
flux measurements. This result is also confirmed by helioseismology
data. A natural consequence of this model is suppressed annihilation,
thereby reducing the tension between indirect and direct dark matter
detection experiments, but the model also allows a greatly enhanced
annihilation cross section. All the cosmological eta ADM scenarios that
we discuss have a relic dark matter density Omega h(2) and baryon
asymmetry eta(B) in agreement with the current WMAP measured values,
Omega(DM)h(2) = 0.1109 +/- 0.0056 and eta(B) = 0.88 x 10(-10).
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