Special Issue "Light on Dark Worlds—A Themed Issue in Honor of Professor Maxim Yu. Khlopov on the Occasion of His 70th Birthday"

A special issue of Physics (ISSN 2624-8174). This special issue belongs to the section "High Energy Physics".

Deadline for manuscript submissions: 31 December 2021.

Special Issue Editors

Prof. Dr. Alexander S. Sakharov
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Guest Editor
1. Experimental Physics Department, CERN, 1211 Geneva 23, Switzerland
2. Department of Physics, Manhattan College, Riverdale, NY 10471, USA
Interests: astroparticle physics; cosmology; particle physics; advance statistics in data analysis
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Konstantin Belotsky
E-Mail Website
Guest Editor
1. Moscow Engineering Physics Institute (MEPHI), National Research Nuclear University (NRNU), Kashirskoe shosse 31, 115409 Moscow, Russia
2. Virtual Institute of Astroparticle Physics, University of Paris, CNRS, Astroparticle and Cosmology, F-75013 Paris, France
Interests: cosmoparticle physics; dark matter; cosmic rays; primordial black holes; particle physics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Sergey G. Rubin
E-Mail Website
Guest Editor
1. Moscow Engineering Physics Institute (MEPHI), National Research Nuclear University (NRNU), Kashirskoe shosse 31, 115409 Moscow, Russia
2. N.I. Lobachevsky Institute of Mathematics and Mechanics, Kazan Federal University, Kremlevskaya Street 18, 420008 Kazan, Russia
Interests: cosmology; multidimensional gravity; primordial black holes

Special Issue Information

Dear Colleagues,

This Special Issue of Physics is dedicated to Professor Dr. Maxim Yu. Khlopov in honor of his 70th birthday. Professor Khlopov is a pioneer in cosmological probes of new physics and the development of cosmoparticle physics, studying the fundamental relationship between cosmology and particle physics in the cross-disciplinary links with its physical, cosmological, and astrophysical signatures. M. Yu. Khlopov’s interest in physics has been in studying the physical basis of modern cosmology and revealing nontrivial features of phenomena, going beyond the standard models of cosmology and particle physics. We open this Special Issue to all areas of physics, shedding light on such phenomena.

We congratulate M. Yu. Khlopov on his birthday and wish him many happy, fruitful years ahead, new fundamental discoveries, and talented disciples. We believe that this Special Issue constitutes a timely celebration of this respected scholar, researcher, and friend. Furthermore, we hope that this Special Issue will inspire scholars, especially junior researchers, to continue the advancement of physics.

Prof. Dr. Alexander S. Sakharov
Prof. Dr. Konstantin Belotsky
Prof. Dr. Sergey G. Rubin
Guest Editors

Manuscript Submission Information

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Keywords

  • Cosmoparticle physics
  • Astroparticle physics
  • Particle physics
  • Dark matter
  • Primordial black holes
  • Inflation
  • Baryosynthesis
  • Dark matter
  • Beyond Standard Model physics
  • Antimatter
  • Mirror world

Published Papers (4 papers)

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Research

Article
Some Features of the Direct and Inverse Double-Compton Effect as Applied to Astrophysics
Physics 2021, 3(4), 1167-1174; https://0-doi-org.brum.beds.ac.uk/10.3390/physics3040074 - 29 Nov 2021
Viewed by 184
Abstract
In the present paper, the process of inverse double-Compton (IDC) scattering is considered in the context of astrophysical applications. It is assumed that the two hard X-ray photons emitted from an astrophysical source are scattered on a free electron and converted into a [...] Read more.
In the present paper, the process of inverse double-Compton (IDC) scattering is considered in the context of astrophysical applications. It is assumed that the two hard X-ray photons emitted from an astrophysical source are scattered on a free electron and converted into a single soft photon of optical range. Using the QED S-matrix formalism for the derivation of a cross-section of direct double-Compton (DDC) scattering and assuming detailed balance conditions, an analytical expression for the cross-section of the IDC process is presented. It is shown that at fixed energies of incident photons, the inverse cross-section has no infrared divergences, and its behavior is completely defined by the spectral characteristics of the photon source itself, in particular by the finite interaction time of radiation with an electron. Thus, even for the direct process, the problem of resolving infrared divergence actually refers to a real physical source of radiation in which photons are never actually plane waves. As a result, the physical frequency profile of the scattered radiation for DDC as well as for IDC processes is a function of both the intensity and line shape of the incident photon field. Full article
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Article
Stellar Structure in a Newtonian Theory with Variable G
Physics 2021, 3(4), 1123-1132; https://0-doi-org.brum.beds.ac.uk/10.3390/physics3040071 - 25 Nov 2021
Viewed by 184
Abstract
A Newtonian-like theory inspired by the Brans–Dicke gravitational Lagrangian has been recently proposed by us. For static configurations, the gravitational coupling acquires an intrinsic spatial dependence within the matter distribution. Therefore, the interior of astrophysical configurations may provide a testable environment for this [...] Read more.
A Newtonian-like theory inspired by the Brans–Dicke gravitational Lagrangian has been recently proposed by us. For static configurations, the gravitational coupling acquires an intrinsic spatial dependence within the matter distribution. Therefore, the interior of astrophysical configurations may provide a testable environment for this approach as long as no screening mechanism is evoked. In this work, we focus on the stellar hydrostatic equilibrium structure in such a varying Newtonian gravitational coupling G scenario. A modified Lane–Emden equation is presented and its solutions for various values of the polytropic index are discussed. The role played by the theory parameter ω, the analogue of the Brans–Dicke parameter, in the physical properties of stars is discussed. Full article
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Article
Supervisor of the Universe
Physics 2021, 3(4), 814-820; https://0-doi-org.brum.beds.ac.uk/10.3390/physics3040051 - 23 Sep 2021
Viewed by 601
Abstract
In this paper, conformal invariant gravitation, based on Weyl geometry, is considered. In addition to the gravitational and matter action integrals, the interaction between the Weyl vector (entered in Weyl geometry) and the vector, representing the world line of the independent observer, are [...] Read more.
In this paper, conformal invariant gravitation, based on Weyl geometry, is considered. In addition to the gravitational and matter action integrals, the interaction between the Weyl vector (entered in Weyl geometry) and the vector, representing the world line of the independent observer, are introduced. It is shown that the very existence of such an interaction selects the exponentially growing scale factor solutions among the cosmological vacua. Full article
Article
Local Regions with Expanding Extra Dimensions
Physics 2021, 3(3), 781-789; https://0-doi-org.brum.beds.ac.uk/10.3390/physics3030048 - 13 Sep 2021
Viewed by 421
Abstract
In this paper possible spatial domains, containing expanding extra dimensions, are studied. It is demonstrated that these domains are predicted in the framework of f(R) gravity (where R is the scalar curviture) and could appear due to quantum fluctuations during [...] Read more.
In this paper possible spatial domains, containing expanding extra dimensions, are studied. It is demonstrated that these domains are predicted in the framework of f(R) gravity (where R is the scalar curviture) and could appear due to quantum fluctuations during inflation. The interior of the domains is shown to be characterized by the multidimensional curvature ultimately tending to zero and a slowly growing size of the extra dimensions. Full article
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