Cosmological Perturbations from Non-Equilibrium Quantum Fields
Cosmological Perturbations from Non-Equilibrium Quantum Fields
Cosmological Perturbations from Non-Equilibrium Quantum Fields
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Massless Preheating<br />
δN = ln(a end /a ref ) * 10 5<br />
12.0<br />
10.0<br />
8.0<br />
6.0<br />
4.0<br />
2.0<br />
0.0<br />
broadened transfer function<br />
quadratic fit for small χ values<br />
raw Monte-Carlo samples<br />
µ 0 T periodicity and its harmonics<br />
fluctuations<br />
-2.0<br />
0.1 1 10 100<br />
(χ ini /M P ) * 10 7<br />
(Bond et al 2009)<br />
Chaotic behaviour: Highly non-Gaussian (Chambers&AR 2007)<br />
Not well approximated by a quadratic f NL<br />
Amplitude ∼ 10 −4 – Observable!<br />
Arttu Rajantie<br />
<strong>Cosmological</strong> <strong>Perturbations</strong> <strong>from</strong> <strong>Non</strong>-<strong>Equilibrium</strong> <strong>Quantum</strong> <strong>Fields</strong> – SEWM 2012
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