66 research outputs found
Q-ball dark matter and baryogenesis in high-scale inflation
We investigate the scenario that one flat direction creates baryon asymmetry
of the unverse, while Q balls from another direction can be the dark matter in
the gauge-mediated supersymmetry breaking for high-scale inflation.
Isocurvature fluctuations are suppressed by the fact that the Affleck-Dine
field stays at around the Planck scale during inflation. We find that the dark
matter Q balls can be detected in IceCube-like experiments in the future.Comment: 9 pages, 3 figures, published versio
Gravitino dark matter and baryon asymmetry from Q-ball decay in gauge mediation
We investigate the Q-ball decay in the gauge-mediated SUSY breaking. Q balls
decay mainly into nucleons, and partially into gravitinos, while they are
kinematically forbidden to decay into sparticles which would be cosmologically
harmful. This is achieved by the Q-ball charge small enough to be unstable for
the decay, and large enough to be protected kinematically from unwanted decay
channel. We can then have right amounts of the baryon asymmetry and the dark
matter of the universe, evading any astrophysical and cosmological
observational constraints such as the big bang nucleosynthesis, which has not
been treated properly in the literatures.Comment: 7 pages, 6 eps figures, footnote adde
Towards the robustness of the Affleck-Dine baryogenesis
We study the Affleck-Dine mechanism with various types of the Kahler
potential, and investigate whether or not the Affleck-Dine field could acquire
a large VEV as an initial condition for successful baryogenesis. In addition to
a negative Hubble-induced mass term, we find that large enough Hubble-induced
A-terms could also develop the minimum at large amplitude of the field.
Therefore, the Affleck-Dine mechanism works for broader classes of the
theories.Comment: 6 page
511 keV line and diffuse gamma rays from moduli
We obtain the spectrum of gamma ray emissions from the moduli whose decay
into accounts for the 511 keV line observed by SPI/INTERGRAL. The
moduli emit gamma rays through internal bremsstrahlung, and also decay directly
into two gammas via tree and/or one-loop diagrams. We show that the internal
bremsstahlung constrains the mass of the moduli below MeV
model-independently. On the other hand, the flux of two gammas directly decayed
from the moduli through one loop diagrams will exceed the observed galactic
diffuse gamma-ray background if the moduli mass exceeds MeV in the
typical situation. Moreover, forthcoming analysis of SPI data in the range of
1-8 MeV may detect the line emisson with the energy half the moduli mass in the
near future, which confirms the decaying moduli scenario.Comment: 6 pages, 5 figures, published versio
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