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Symmetry
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Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary
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Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 9525

Special Issue Editor

Prof. Dr. Maxim Y. Khlopov

E-Mail Website
Guest Editor
1. President and Full Professor, Center for Cosmopartilce Physics "Cosmion", National Research Nuclear University ”Moscow Engineering Physics Institute”, Moscow, Russia
2. Virtual Institute of Astroparticle Physics, 75018 Paris, France
3. Principal Researcher, Institute of Physics, Southern Federal University, Rostov on Don, Russia
Interests: cosmoparticle physics; cosmology and particle physics; physics of dark matter and the early universe; physics beyond the standard model
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The trend of modern development of particle physics leads beyond the standard model (BSM). BSM physics is needed for a physical basis for the now-standard cosmological model of an inflationary Universe with baryosynthesis, dark matter, and dark energy. BSM models involve the extension of particle symmetry that leads to numerous physical and cosmological consequences. The mutual relationship of the basis of modern particle physics and cosmology, as well as the nontrivial features of its indirect physical, cosmological, and astrophysical effects, is the subject of the present Special Issue. Such features involve but are not reduced to models of the very early Universe and their observational signatures, physics of dark matter and its direct and indirect probes, as well as a wide range of BSM models and their effects.

Prof. Maxim Khlopov
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • cosmology
  • particles physics
  • astroparticle physics
  • cosmoparticle physics
  • BSM models
  • dark matter
  • inflation
  • baryosynthesis
  • supergravity
  • extra dimensions

Published Papers (5 papers)

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Research

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16 pages, 325 KiB  
Article
Using Cosmological Perturbation Theory to Distinguish between GR and Unimodular Gravity
by Júlio C. Fabris, Marcelo H. Alvarenga and Hermano Velten
Symmetry 2023, 15(7), 1392; https://doi.org/10.3390/sym15071392 - 10 Jul 2023
Cited by 6 | Viewed by 860
Abstract
Unimodular gravity is one of the oldest geometric gravity theories and alternatives to general relativity. Essentially, it is based on the Einstein–Hilbert Lagrangian with an additional constraint on the determinant of the metric. It can be explicitly shown that unimodular gravity can be [...] Read more.
Unimodular gravity is one of the oldest geometric gravity theories and alternatives to general relativity. Essentially, it is based on the Einstein–Hilbert Lagrangian with an additional constraint on the determinant of the metric. It can be explicitly shown that unimodular gravity can be recast as general relativity in the presence of a cosmological constant. This fact has led to many discussions on the equivalence of both theories at the classical and quantum levels. Here, we present an analysis focused on the classical scalar perturbations around a cosmological background. We focus on the unusual situation in which the typical conservation laws are not adopted. The discussion is extended to the case where a non-minimal coupled scalar field is introduced. We also present a gauge-invariant analysis showing that perturbations in unimodular gravity display instabilities. Our results reinforce that the equivalence is not verified completely at a cosmological perturbative level. Full article
(This article belongs to the Special Issue Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary)
9 pages, 634 KiB  
Article
Relativistic Corrections to the Higgs Boson Decay into a Pair of Vector Quarkonia
by Alexei P. Martynenko and Fedor A. Martynenko
Symmetry 2023, 15(2), 448; https://doi.org/10.3390/sym15020448 - 08 Feb 2023
Cited by 1 | Viewed by 1675
Abstract
We studied different mechanisms in the Higgs boson decay into a pair of J/Ψ and Υ particles within the perturbative Standard Model and relativistic quark model. The relativistic corrections to the decay amplitude and decay width were calculated. We obtained numerical [...] Read more.
We studied different mechanisms in the Higgs boson decay into a pair of J/Ψ and Υ particles within the perturbative Standard Model and relativistic quark model. The relativistic corrections to the decay amplitude and decay width were calculated. We obtained numerical values of the decay widths of the Higgs boson, which can be used for comparison with experimental data. Full article
(This article belongs to the Special Issue Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary)
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6 pages, 834 KiB  
Article
Neutrino Cooling of Primordial Hot Regions
by Konstantin Belotsky, Mohamed El Kasmi and Sergey Rubin
Symmetry 2020, 12(9), 1442; https://doi.org/10.3390/sym12091442 - 01 Sep 2020
Cited by 2 | Viewed by 1741
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary)
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15 pages, 280 KiB  
Article
Cosmology and Matter-Induced Branes
by Sergey G. Rubin
Symmetry 2020, 12(1), 45; https://doi.org/10.3390/sym12010045 - 25 Dec 2019
Cited by 2 | Viewed by 1956
Abstract
The extra space paradigm plays a significant role in modern physics and cosmology as a specific case. In this review, the relation between the main cosmological parameters—the Planck mass and the Cosmological constants—and a metric of extra space is discussed. Matter distribution inside [...] Read more.
The extra space paradigm plays a significant role in modern physics and cosmology as a specific case. In this review, the relation between the main cosmological parameters—the Planck mass and the Cosmological constants—and a metric of extra space is discussed. Matter distribution inside extra space and its effect on the 4-dimensional observational parameters is of particular interest. The ways to solve the fine-tuning problem and the hierarchy problem are analyzed. Full article
(This article belongs to the Special Issue Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary)
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Review

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14 pages, 882 KiB  
Review
Modified Gravity in Higher Dimensions, Flux Compactification, and Cosmological Inflation
by Sergei V. Ketov
Symmetry 2019, 11(12), 1528; https://doi.org/10.3390/sym11121528 - 17 Dec 2019
Cited by 3 | Viewed by 2196
Abstract
We review a possible origin of cosmological inflation from higher ( D ) spacetime dimensions in the context of modified gravity theory. It is demonstrated that it requires a spontaneous warped compactification of higher ( D ) spacetime dimensions together with the stabilization [...] Read more.
We review a possible origin of cosmological inflation from higher ( D ) spacetime dimensions in the context of modified gravity theory. It is demonstrated that it requires a spontaneous warped compactification of higher ( D ) spacetime dimensions together with the stabilization of extra ( D − 4 ) dimensions by Freund–Rubin mechanism. The relevant tools include an extra gauge ( D / 2 − 1 ) -form field with a non-vanishing flux in compact dimensions and a positive cosmological constant in D dimensions. Those features are illustrated on the specific example in eight spacetime dimensions compactified on a four-sphere with a warped factor and a flux, which leads to a viable Starobinsky-like inflationary model in four (non-compact) spacetime dimensions. Full article
(This article belongs to the Special Issue Cosmoparticle Physics - dedicated to A.D.Sakharov's 100 Anniversary)
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