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2019

Electron-Positron Annihilation Freeze-Out in the Early Universe

Thomas, Luke C., Dezen, Ted, Grohs, Evan B. et al.

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Electron-positron annihilation largely occurs in local thermal and chemical equilibrium after the neutrinos fall out of thermal equilibrium and during the Big Bang Nucleosynthesis (BBN) epoch.

The effects of this process are evident in BBN yields as well as the relativistic degrees of freedom.
We self-consistently calculate the collision integral for electron-positron creation and annihilation using the Klein-Nishina amplitude and appropriate statistical factors for Fermi-blocking and Bose-enhancement.
Our calculations suggest that this annihilation freezes out when the photon-electron-positron-baryon plasma temperature is approximately 16 keV, after which its rate drops below the Hubble rate.

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