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OATS-DAUT SEMINAR
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Speaker:
Maxim Yu. Khlopov (Moscow Engineering Physics Inst. and Center
for Cosmoparticle Physics, Moscow)
Title:
Nonstandard nucleosynthesis as cosmological consequence of particle
theory
Date: Monday, December 10th, 2007
Time: 12:00
Venue: Villa Bazzoni
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Abstract:
Cascades of energetic particles from decay of
metastable primordial particles in early Universe interact with nuclei
formed in SBBN and influence light element abundance. Negatively
charged metastable particles can bind with He-4 in atom-like ion,
strongly influencing the rate of SBBN nuclear reactions. It provides
constraints on on the particles and models, which predict them, from
observation of light element abundance. Composite dark matter hides
stable heavy charged particles in neutral atom-like states. Physical
examples of such stable particles are given. In the early Universe
formation of composite dark matter is accompanied by formation of
various fractions of exotic matter, which are severely constrained by
observations. Observational consequences of various composite dark
matter models (in particular, an interesting realization of warm dark
matter scenario) as well as the possibilities of direct search of its
charged constituents in cosmic rays and at accelerators are
discussed. The necessary prediction of such models is existence of an
atom like bound system of negatively charged particle Q^{-2} with He,
which catalyzes nuclear transformations and, in particular, gives rise
to formation of primordial heavy elements in the Universe after helium
is formed in SBBN.
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contact: Paolo Molaro (OATS)