DECAYING DARK MATTER,
NEUTRINO MASSES AND
LEPTOGENESIS
Dmitry Zhuridov
(NTHU, Hsinchu)
International Workshop on Dark Matter, Dark Energy
and Matter-Antimatter Asymmetry
November 20-21, 2009
Hsinchu, Taiwan
In collaboration with: Chao-Qiang Geng (NTHU)
Chuan-Hung Chen (NCKU & NCTS)
Outline
Brief introduction and motivation
Non-degenerate Low
Energy LG
•
•
•
•
•
•
Neutrino Masses, LG
and Decaying DM
Model definition
LG realization. Neutrino masses generation
DM and Li problems solvation
Possible Colliders signatures and EW precision tests
Model (LG, nu masses & DM)
Results
Conclusion
Brief introduction and motivation
Properties of the universe
Evidence of incompleteness of the
SM
Experiment:
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•
Theory:
•
•
(particles) Neutrino Masses
(astro-ph) DM?
(particles) Quadratically divergent Higgs mass
at the one-loop level
(astro-ph) Baryon asymmetry. Li problems?
Possible solutions
+ NR :
Small neutrino masses
Standard LG
+ SUSY :
}
MR > 10^9 GeV
(Davidson-Ibarra bound)
Higgs mass is not quadratically
divergent
TR < 10^7 GeV for the gravitino LSP
Gravitino problem arise! How to produce NR?
We are searching for alternative solutions with
no NR and no SUSY.
Non-degenerate Low Energy LG
Positive reply from Phys.Rev.D
Basic ideas come from
•
Ernest Ma (2006): Verifible Radiative Seesaw
Mechanizm of Neutrino masses and DM
(Z2 odd HMNs and new scalardoublet
η
•
)
Pei-Hong Gu and Utpal Sarkar (2008):
Pathways to tastable LG
η masses is needed to satisfy
(Degeneracy of N and
the out-of-equilibrium condition)
Model definition
Leptogenesis realization
Neutrino Masses generation
2
Modified Davidson-Ibarra bound
Dark Matter generation
Li problems solvation
Possible Collider Signatures
Electroweak Precision Tests
satisfaction
• Remark:
The considered model may avoid
the problem of the inert doublet one, which
suffers from the inconsistency of the vacuum
stability conditions with the requirement of
cancellation of quadratic divergences.
Model
Results
Conclusion
We have investigated a simple extension of the SM to
explain the neutrino masses, the observed BAU, DM and
lithium abundances in the universe. The proposed model
satisfies the electroweak precision constraints and is
testable in the forthcoming collider experiments.
We have separated the new fermions in this model into
two classes under the Z2 transformations to explain the
PAMELA/Fermi positron/electron excesses in cosmic
rays.
We note that in the considered class of models it is
possible to explain the measured value of the muon g-2.