Special Issue "Beyond the Standard Models in Particle Physics and Cosmology"

A special issue of Particles (ISSN 2571-712X).

Deadline for manuscript submissions: closed (31 October 2020).

Special Issue Editor

Prof. Dr. Maxim Yu. Khlopov
E-Mail Website
Guest Editor
1. Center for Cosmopartilce physics "Cosmion" and Full Professor of National Research Nuclear University ”Moscow Engineering Physics Institute”, 115409 Moscow, Russia
2. Virtual Institute of Astroparticle Physics, Universit ́e de Paris, CNRS, Astroparticule et Cosmologie, F-75013 Paris, France
3. Institute of Physics, Southern Federal University, 344006 Rostov-on-Don, Russia
Interests: cosmoparticle physics; cosmology and particle physics; physics of dark matter and the early universe; physics beyond the standard model
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Special Issue Information

Dear colleagues,

Studies beyond the standard model (BSM) of particle physics is the mainstream of current scientific research.

BSM physics is the widely established basis of modern cosmology and thus is a popular topic in practically all conferences on particle physics and cosmology.

The purpose of the Bled Workshops "What comes beyond the Standard models?" is not only to present new results on this subject but also to clarify all the points in extensive non-formal discussions. XXII Bled Workshop "What comes beyond the Standard models?" extends the platform for such discussions to the present Special Issue, inviting not only authors of the selected presentations at this workshop but also any other interested contributors. Special support for scientific debuts in this field is another important feature of the present issue, inviting MSc and Ph.D. students to make their first steps in research in this exciting field of science. The best contributions will receive the Particles Scientific debut award that will authors to attend and participate in the next workshop.

Prof. Dr. Maxim Yu. 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 papers will be 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. Particles is an international peer-reviewed open access quarterly 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 1200 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.

Published Papers (4 papers)

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Research

Article
Squeezing the Parameter Space for Lorentz Violation in the Neutrino Sector with Additional Decay Channels
Particles 2020, 3(3), 630-641; https://0-doi-org.brum.beds.ac.uk/10.3390/particles3030041 - 26 Aug 2020
Cited by 2 | Viewed by 826
Abstract
The hypothesis of Lorentz violation in the neutrino sector has intrigued scientists for the last two to three decades. A number of theoretical arguments support the emergence of such violations, first and foremost for neutrinos, which constitute the “most elusive” and “least interacting” [...] Read more.
The hypothesis of Lorentz violation in the neutrino sector has intrigued scientists for the last two to three decades. A number of theoretical arguments support the emergence of such violations, first and foremost for neutrinos, which constitute the “most elusive” and “least interacting” particles known to mankind. It is of obvious interest to place stringent bounds on the Lorentz-violating parameters in the neutrino sector. In the past, the most stringent bounds have been placed by calculating the probability of neutrino decay into a lepton pair, a process made kinematically feasible by Lorentz violation in the neutrino sector, above a certain threshold. However, even more stringent bounds can be placed on the Lorentz-violating parameters if one takes into account, additionally, the possibility of neutrino splitting, i.e., of neutrino decay into a neutrino of lower energy, accompanied by “neutrino-pair Čerenkov radiation.” This process has a negligible threshold and can be used to improve the bounds on Lorentz-violating parameters in the neutrino sector. Finally, we take the opportunity to discuss the relation of Lorentz and gauge symmetry breaking, with a special emphasis on the theoretical models employed in our calculations. Full article
(This article belongs to the Special Issue Beyond the Standard Models in Particle Physics and Cosmology)
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Article
Relations between Clifford Algebra and Dirac Matrices in the Presence of Families
Particles 2020, 3(3), 518-531; https://0-doi-org.brum.beds.ac.uk/10.3390/particles3030035 - 29 Jun 2020
Viewed by 789
Abstract
The internal degrees of freedom of fermions are in the spin-charge-family theory described by the Clifford algebra objects, which are superposition of an odd number of γa’s. Arranged into irreducible representations of “eigenvectors” of the Cartan subalgebra of the Lorentz algebra [...] Read more.
The internal degrees of freedom of fermions are in the spin-charge-family theory described by the Clifford algebra objects, which are superposition of an odd number of γ a ’s. Arranged into irreducible representations of “eigenvectors” of the Cartan subalgebra of the Lorentz algebra S a b ( = i 2 γ a γ b | a b ) these objects form 2 d 2 1 families with 2 d 2 1 family members each. Family members of each family offer the description of all the observed quarks and leptons and antiquarks and antileptons, appearing in families. Families are reachable by S ˜ a b = 1 2 γ ˜ a γ ˜ b | a b . Creation operators, carrying the family member and family quantum numbers form the basis vectors. The action of the operators γ a ’s, S a b , γ ˜ a ’s and S ˜ a b , applying on the basis vectors, manifests as matrices. In this paper the basis vectors in d = ( 3 + 1 ) Clifford space are discussed, chosen in a way that the matrix representations of γ a and of S a b coincide for each family quantum number, determined by S ˜ a b , with the Dirac matrices. The appearance of charges in Clifford space is discussed by embedding d = ( 3 + 1 ) space into d = ( 5 + 1 ) -dimensional space. The achievements and predictions of the spin-charge-family theory is also shortly presented. Full article
(This article belongs to the Special Issue Beyond the Standard Models in Particle Physics and Cosmology)
Article
Formation of Conserved Charge at the de Sitter Space
Particles 2020, 3(2), 355-363; https://0-doi-org.brum.beds.ac.uk/10.3390/particles3020027 - 14 Apr 2020
Viewed by 979
Abstract
The article considers a new mechanism of charge accumulation in the early Universe in theories with compact extra dimensions. The relaxation processes in the extra space metric that take place during its formation lead to the establishment of symmetrical extra space configuration. As [...] Read more.
The article considers a new mechanism of charge accumulation in the early Universe in theories with compact extra dimensions. The relaxation processes in the extra space metric that take place during its formation lead to the establishment of symmetrical extra space configuration. As a result, the initial accumulation of the number associated with the symmetry occurs. We demonstrate this mechanism using a simple example of a two-dimensional apple-like extra space metric with U ( 1 ) -symmetry. The conceptual idea of the mechanism can be used to develop a model for the production of the baryon or lepton number in the early Universe. Full article
(This article belongs to the Special Issue Beyond the Standard Models in Particle Physics and Cosmology)
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Article
Cosmic Gamma Ray Constraints on the Indirect Effects of Dark Matter
Particles 2020, 3(2), 336-344; https://0-doi-org.brum.beds.ac.uk/10.3390/particles3020025 - 08 Apr 2020
Cited by 1 | Viewed by 797
Abstract
The observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation [...] Read more.
The observed anomalous excess of high-energy cosmic ray (CR) positrons is widely discussed as possible indirect evidence for dark matter (DM). However, any source of cosmic positrons is inevitably the source of gamma radiation. The least model dependent test of CR anomalies interpretation via DM particles decays (or annihilation) is connected with gamma-ray background due to gamma overproduction in such processes. In this work, we impose an observational constraint on gamma ray production from DM. Then, we study the possible suppression of gamma yield in the DM decays into identical final fermions. Such DM particles arise in the multi-component dark atom model. The influence of the interaction vertices on the gamma suppression was also considered. No essential gamma suppression effects are found. However, some minor ones are revealed. Full article
(This article belongs to the Special Issue Beyond the Standard Models in Particle Physics and Cosmology)
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