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arXiv · 2009.05661

Reactions Governing Strangeness Abundance in Primordial Universe

Johann Rafelski·Cheng Tao Yang
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Abstract

Strangness production processes can balance natural strangeness decay in the early hadronic Universe. Comparing to the characteristic Hubble time $1/H$, the reaction rates for $\mu^\pm+\nu_{\mu}\rightarrow K^\pm$, $l^-+l^+\rightarrow\phi$, and $\pi+\pi\rightarrow K$ in sequence become slower than expansion rate at $T=33.9\,\mathrm{MeV}$, $T=25\,\mathrm{MeV}$ and $T=20\,\mathrm{MeV}$ respectively. This means that in the antibaryon annihilation epoch near to $T\simeq 40\,\mathrm{MeV}$ strangeness is in chemical equilibrium.

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Johann Rafelski, Cheng Tao Yang. 2020-09-11. Reactions Governing Strangeness Abundance in Primordial Universe. https://doi.org/10.1051/epjconf/202225913001

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