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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Calculating the Perturbation<br />
Solve Friedmann+field eqs for each separate universe<br />
(ȧ ) 2<br />
H 2 = =<br />
a<br />
ρ(φ, χ)<br />
3M 2 P l<br />
Gives a(t), ρ(t)<br />
<strong>Non</strong>-linear, includes gravity, valid at d ≫ H −1<br />
Pick ρ ∗ < ρ therm , and calculate ζ = δ ln a| ρ=ρ∗<br />
⇒ Gives curvature perturbation for given φ 0 , χ 0<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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