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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Particle Physics in the CMB<br />
Adiabatic evolution ⇒ Perturbation conserved<br />
⇒ We need non-equilibrium dynamics<br />
Horizon then ≪ Horizon now<br />
⇒ We need correlations over many, many horizon lengths<br />
Causality: Correlations cannot appear after inflation<br />
⇒ We need an isocurvature perturbation<br />
Simplest possibility: Light (m < H) scalar field<br />
Since last week we know such fields actually exist!<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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