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New probes of initial state of quantum fluctuations during inflation

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Chemical potential from<br />

energy injection<br />

• For ze –<br />

+2γ, freezes out.<br />

• However, the elastic scattering, e – +γ->e – +γ, remains<br />

effective [until zf=5x10 4 ]<br />

• Black-body spectrum is not restored, but the spectrum<br />

relaxes to a Bose-Einstein spectrum with a non-zero<br />

chemical potential, μ, for zf

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