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High Energy Theory Lunchtime Seminar


Jean-Francois Dufaux, University of Toronto will deliver a lunch seminar on Thursday June 14th at 12:15 p.m. in Room 435 physics. The title of his talk is, "Stochastic gravitational wave background from preheating after inflation."

The abstract of the Dufaux's talk is as follows.

"The origin of matter in the universe from a decaying inflaton
field is a basic feature of the inflationary paradigm. In many
models, the first stage of this process, called preheating, is
dominated by an explosive and non-perturbative production of highly
inhomogeneous, non-thermal field fluctuations. These act in
particular as a classical source for gravitational radiation.

In this talk, I will first review some aspects of preheating and

of the subsequent evolution of the inflaton decay products towards
thermal equilibrium. I will then discuss the computation of the
resulting background of gravitational waves. The corresponding
spectrum has a higher amplitude than the one generated during
inflation, and it may fall into the range accessible for direct
detection experiments (LIGO/VIRGO or BBO) if inflation occurs at a
low enough energy scale. The discovery of such a background would
open a new observational window into the dynamics of the very early

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