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Arjun Berera
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Fluctuation-dissipation dynamics in the early universe
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I discuss the role of fluctuation-dissipation
dynamics
in the early universe, in particular during
inflation
and cosmological
phase transitions. Warm inflation was proposed
more
than 2 decades ago, which utilizes fluctuation-dissipation
dynamics
to give an alternative dynamical picture
of inflation.
Its been long viewed that warm inflation
would be very difficult to realize in a simple
first
principles
quantum field theory model. In this talk
I present
results of
a recent model we have developed in which
the inflaton
is
a pseudo Nambu-Goldstone boson of a broken
gauge symmetry
and its mass is naturally protected against
large quantum
and thermal corrections. The model is similar
to the
Little Higgs mechanism for electroweak symmetry
breaking.
Such a model
requires only a few fields to realize warm
inflation,
and so is
as simple as any cold inflation model. Predictions
and model
building prospects for the model are discussed.
Further
applications to cosmological phase transition
and baryogenesis
are discussed.
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