School of Astronomy

School of Astronomy (SoA) Weekly Seminar

Tachyonic Resonance Preheating in Expanding Universe

Ali Akbar Abolhasani (SUT & IPM)

Abstract:

In my talk I'll briefly review general aspects of "Reheating" .

After that I'll go on to our recent paper "Tachyonic Resonance Preheating in
Expanding Universe". In this paper the tachyonic resonance preheating
generated from the bosonic trilinear \phi \chi^2 interactions in an expanding
Universe is studied. We find that the occupation number of the produced
particles has a non-linear exponential growth with exponent ~ x3/2, where x
is the conformal time. This should be contrasted with preheating from a
periodic resonant source, where the occupation number has a linear exponential
growth.

Wednesday / 3-Feb.-2010 / 14-Bahman-1388/ 2:00 PM

IPM Larak Building, School of Astronomy
Address: Larak Garden, opposite Araj, Artesh Highway,Tehran, Iran
E-mail: astro(at)ipm.ir