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Events on Thursday, October 30th, 2008

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Thermal inflation, gravitational waves, baryogenesis and dark matter
Time: 4:00 pm
Place: 4274 Chamberlin
Speaker: Wan-Il Park, KAIST
Abstract: We propose a simple extension of the Minimal Supersymmetric Standard Model which
gives rise to thermal inflation, baryogenesis and dark matter in a natural and
remarkably consistent way.
We consider the $lambda_phi = 0$ special case of our previous model, which is the
minimal way to incorporate a Peccei-Quinn symmetry.
The axino becomes the lightest supersymmetric particle with $m_{ ilde{a}} sim 1
extrm{ to } 10 GeV$ and is typically over-produced during the flaton decay.
Interestingly though, the dark matter abundance is minimized for $m_{ ilde{a}} sim
1 GeV$, $f_a sim 10^{11} extrm{ to } 10^{12} GeV$ and $|mu| sim 400 GeV
extrm{ to } 1 TeV$ at an abundance coincident with the observed abundance and
with significant amounts of both axions and axinos.
Futhermore, for these values the baryon abundance naturally matches the observed
abundance.
As an observable, thermal inflation which is the key idea of the model produces a
background of gravitational waves.
It is likely to be detected at BBO and DECIGO style direct detection experiments.
Host: Dan Chung
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Graduate Introductory Seminar
Atomic and Molecular Intro Seminar
Time: 5:30 pm
Place: 2223 Chamberlin Hall
Speaker: Atomic & Molecular Group, Physics Department
Abstract: Introductory Seminar for first year Grad Students (others welcome)
Host: Atomic & Molecular Group
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