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Volume 12
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10.3390/sym12091442
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Article

Neutrino Cooling of Primordial Hot Regions

by
Konstantin Belotsky
1,*,
Mohamed El Kasmi
1,2 and
Sergey Rubin
1,3
1
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe Shosse 31, 115409 Moscow, Russia
2
Physics Department, Faculty of Science, Sohag Center, Sohag University, Sohag 82524, Egypt
3
N. I. Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, Kremlevskaya Street 18, 420008 Kazan, Russia
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(9), 1442; https://doi.org/10.3390/sym12091442
Submission received: 7 August 2020 / Revised: 21 August 2020 / Accepted: 28 August 2020 / Published: 1 September 2020
(This article belongs to the Special Issue Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary)
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Abstract

The effect of neutrino cooling of possible primary regions filled by hot matter is discussed. Such regions could be obtained from the primordial density inhomogeneities and survive up to the modern epoch. The inhomogeneities could be caused by a symmetry breaking during the inflationary stage. We show that the final temperature of such region should be ∼10 keV provided that the initial temperature is within the interval 10 keV ÷ 100 MeV. The cooling is realized due to the weak nuclear reactions containing n−p transition. The lower limit 10keV is accounted for by suppression of the reactions rates because of the threshold effect and particle concentration decrease.
Keywords: primordial hot regions; neutrino cooling; primordial black holes primordial hot regions; neutrino cooling; primordial black holes

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MDPI and ACS Style

Belotsky, K.; El Kasmi, M.; Rubin, S. Neutrino Cooling of Primordial Hot Regions. Symmetry 2020, 12, 1442. https://doi.org/10.3390/sym12091442

AMA Style

Belotsky K, El Kasmi M, Rubin S. Neutrino Cooling of Primordial Hot Regions. Symmetry. 2020; 12(9):1442. https://doi.org/10.3390/sym12091442

Chicago/Turabian Style

Belotsky, Konstantin, Mohamed El Kasmi, and Sergey Rubin. 2020. "Neutrino Cooling of Primordial Hot Regions" Symmetry 12, no. 9: 1442. https://doi.org/10.3390/sym12091442

APA Style

Belotsky, K., El Kasmi, M., & Rubin, S. (2020). Neutrino Cooling of Primordial Hot Regions. Symmetry, 12(9), 1442. https://doi.org/10.3390/sym12091442

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