New probes of initial state of quantum fluctuations during inflation

Bottom Line
• Therefore, the chemical potential is generated by
the photon density perturbation squared.
• At what scale? The diffusion damping occurs at
the mean free path of photons. In terms of the
wavenumber, it is given by:
It’s a very small scale!
(compared to the large-scale structure, k~1 Mpc –1 )
;
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