Cosmological strangeness abundance
dc.contributor.author | Yang, C.T. | |
dc.contributor.author | Rafelski, J. | |
dc.date.accessioned | 2022-03-31T21:14:18Z | |
dc.date.available | 2022-03-31T21:14:18Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | Yang, C. T., & Rafelski, J. (2022). Cosmological strangeness abundance. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. | |
dc.identifier.issn | 0370-2693 | |
dc.identifier.doi | 10.1016/j.physletb.2022.136944 | |
dc.identifier.uri | http://hdl.handle.net/10150/663855 | |
dc.description.abstract | We investigate the strange particle composition of the expanding early Universe in the hadron epoch Th≈150≥T≥10 MeV. We study strangeness yield in thermal and chemical equilibrium constrained by prescribed conserved entropy per baryon in a charge neutral and strangeness neutral 〈s−s¯〉 Universe. Turning to kinetic processes in a Hubble expanding Universe, we determine the conditions at which at decreasing temperature T individual strangeness producing reactions fall out of detailed balance between decay and back-reaction strangeness production rates: This is done by comparing the relevant reaction rates to the Hubble expansion rate. We allow for weak, electromagnetic, and strong interaction processes. The weak interaction μ±+νμ→K± freezeout is at TfK±=33.8 MeV; the electromagnetic process l−+l+→ϕ freezeout is at Tfϕ=23∼25 MeV; and the hadronic reaction π+π→K freezeout is at TfK=19.8 MeV. © 2022 The Author(s) | |
dc.language.iso | en | |
dc.publisher | Elsevier B.V. | |
dc.rights | Copyright © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.title | Cosmological strangeness abundance | |
dc.type | Article | |
dc.type | text | |
dc.contributor.department | Department of Physics, The University of Arizona | |
dc.identifier.journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | |
dc.description.note | Open access journal | |
dc.description.collectioninformation | This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. | |
dc.eprint.version | Final published version | |
dc.source.journaltitle | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | |
refterms.dateFOA | 2022-03-31T21:14:18Z |