The muon abundance in the primordial universe

Jan Rafelski; Cheng Tao Yang

doi:10.5506/APHYSPOLB.52.277

The muon abundance in the primordial universe

Jan Rafelski, Cheng Tao Yang

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Muon abundance is required for the understanding of several fundamental questions regarding properties of the primordial Universe. In this paper, we evaluate the production and decay rates of muons in the cosmic plasma as a function of temperature. This allows us to determine when exactly the muon abundance disappears. When the Universe cools below the temperature kT_disappear ≈ 4.135 MeV, the muon decay rate overwhelms production rates and muons vanish quasi-instantaneously from the Universe. Interestingly, we show that at T_disappear, the muon number is nearly equal to baryon abundance.

Original language	English (US)
Pages (from-to)	277-286
Number of pages	10
Journal	Acta Physica Polonica B
Volume	52
Issue number	3
DOIs	https://doi.org/10.5506/APHYSPOLB.52.277
State	Published - 2021

ASJC Scopus subject areas

General Physics and Astronomy

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10.5506/APHYSPOLB.52.277

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title = "The muon abundance in the primordial universe",

abstract = "Muon abundance is required for the understanding of several fundamental questions regarding properties of the primordial Universe. In this paper, we evaluate the production and decay rates of muons in the cosmic plasma as a function of temperature. This allows us to determine when exactly the muon abundance disappears. When the Universe cools below the temperature kTdisappear ≈ 4.135 MeV, the muon decay rate overwhelms production rates and muons vanish quasi-instantaneously from the Universe. Interestingly, we show that at Tdisappear, the muon number is nearly equal to baryon abundance.",

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AB - Muon abundance is required for the understanding of several fundamental questions regarding properties of the primordial Universe. In this paper, we evaluate the production and decay rates of muons in the cosmic plasma as a function of temperature. This allows us to determine when exactly the muon abundance disappears. When the Universe cools below the temperature kTdisappear ≈ 4.135 MeV, the muon decay rate overwhelms production rates and muons vanish quasi-instantaneously from the Universe. Interestingly, we show that at Tdisappear, the muon number is nearly equal to baryon abundance.

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The muon abundance in the primordial universe

Abstract

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