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Selected Papers from XXVIII Workshop “What Comes Beyond the Standard...
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Selected Papers from XXVIII Workshop “What Comes Beyond the Standard Models?”: New Trends in Particle Cosmology

A special issue of Particles (ISSN 2571-712X). This special issue belongs to the section "Phenomenology and Physics Beyond the Standard Model".

Deadline for manuscript submissions: 30 June 2026 | Viewed by 4007

Special Issue Editor

Prof. Dr. Maxim Y. Khlopov

E-Mail Website
Guest Editor
Virtual Institute of Astroparticle Physics, 75018 Paris, France
Interests: cosmology; particle physics; beyond standard models; cosmoparticle physics; dark matter; primordial black holes; antimatter
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will host selected papers from the XXVIII International Workshop “What Comes Beyond the Standard Models?”, which will be held in Bled, Slovenia, from 6th July 2025 to 16th July 2025 (http://bsm.fmf.uni-lj.si/bled2025bsm). Its aim is to present the trends in the exploration of particle cosmology in its studies of particle physics and cosmology beyond the standard models. The article processing charge (APC) for submissions from the workshop will be waived, and publication will be free of charge.

Prof. Dr. Maxim Y. 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 250 words) can be sent to the Editorial Office for assessment.

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 1600 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
  • particle physics
  • cosmoparticle physics
  • dark matter
  • inflation
  • baryosynthesis
  • extra dimensions
  • physics beyond the standard model

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Published Papers (4 papers)

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Research

10 pages, 1308 KB  
Article
Baryon-like Space Distribution of Dark Matter from Point of View of Explanation of Positron Anomaly
by Konstantin M. Belotsky and Maksim L. Solovev
Particles 2026, 9(1), 15; https://doi.org/10.3390/particles9010015 - 13 Feb 2026
Viewed by 264
Abstract
In this work we test the possibility of accounting for the positron anomaly with annihilating dark matter particles without contradicting the gamma-ray constraints due to their unconventional space distribution. To achieve that, we consider two-component dark matter, whose major constituent is inert and [...] Read more.
In this work we test the possibility of accounting for the positron anomaly with annihilating dark matter particles without contradicting the gamma-ray constraints due to their unconventional space distribution. To achieve that, we consider two-component dark matter, whose major constituent is inert and forms the halo of the Galaxy, while the second, minor, component consists of annihilating particles that could form some different structure. This work is the next logical step after our previous “dark disk model” where an active DM component was considered to form a disk, allowing good suppression of accompanying gamma-radiation. Nowadays that model is not enough to avoid the contradiction, so we are testing a new, more complex one with a spiral spatial distribution like the one of baryons. We have previously tested two simplified toy models of ring-like density profiles and one simple spiral density profile that have shown good improvement compared to the disk case. In this work, we take things further and consider a more physically grounded density profile constructed on the base of a modern model of the baryon density of our Galaxy. Contrary to our expectations, this advanced model shows much worse agreement with the data than previous toy models. Full article
(This article belongs to the Special Issue Selected Papers from XXVIII Workshop “What Comes Beyond the Standard Models?”: New Trends in Particle Cosmology)
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14 pages, 543 KB  
Article
Clusters of PBHs in a Framework of Multidimensional f(R)-Gravity
by Maxim Krasnov and Valery Nikulin
Particles 2026, 9(1), 12; https://doi.org/10.3390/particles9010012 - 3 Feb 2026
Viewed by 388
Abstract
We investigate primordial black hole (PBH) production via the collapse of supercritical domain walls in a quadratic f(R)-gravity model with tensor extensions. The effective field theory for an extra space’s scalar curvature provides a foundation for the formation of [...] Read more.
We investigate primordial black hole (PBH) production via the collapse of supercritical domain walls in a quadratic f(R)-gravity model with tensor extensions. The effective field theory for an extra space’s scalar curvature provides a foundation for the formation of these dense walls. In our work, domain walls are found to be supercritical. Their properties were extensively studied in the literature, where it was demonstrated that they create wormholes and escape into baby universes through them. Closure of the wormhole leads to black hole creation, providing a mechanism for the production of primordial black holes in our model. We calculate the mass spectrum of such black holes and mass distribution within clusters of them. When accretion is accounted for, the black holes produced under this mechanism present viable dark matter candidates. Full article
(This article belongs to the Special Issue Selected Papers from XXVIII Workshop “What Comes Beyond the Standard Models?”: New Trends in Particle Cosmology)
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28 pages, 438 KB  
Article
Holographic Naturalness and Information See-Saw Mechanism for Neutrinos
by Andrea Addazi and Giuseppe Meluccio
Particles 2026, 9(1), 11; https://doi.org/10.3390/particles9010011 - 2 Feb 2026
Viewed by 509
Abstract
The microscopic origin of the de Sitter entropy remains a central puzzle in quantum gravity that is related to the cosmological constant problem. Within the paradigm of Holographic Naturalness, we propose that this entropy is carried by a vast number of [...] Read more.
The microscopic origin of the de Sitter entropy remains a central puzzle in quantum gravity that is related to the cosmological constant problem. Within the paradigm of Holographic Naturalness, we propose that this entropy is carried by a vast number of light, coherent degrees of freedom—called “hairons”—which emerge as the moduli of gravitational instantons on orbifolds. Starting from the Euclidean de Sitter instanton (S4), we construct a new class of orbifold gravitational instantons, S4/ZN, where N corresponds to the de Sitter entropy. We demonstrate that the dimension of the moduli space of these instantons scales linearly with N, and we identify these moduli with the hairon fields. A ZN symmetry, derived from Wilson loops in the instanton background, ensures the distinguishability of these modes, leading to the correct entropy count. The hairons acquire a mass of the order of the Hubble scale and exhibit negligible mutual interactions, suggesting that the de Sitter vacuum is a coherent state, or Bose–Einstein condensate, of these fundamental excitations. Then, we present a novel framework which unifies neutrino mass generation with the cosmological constant through gravitational topology and holography. The small neutrino mass scale emerges naturally from first principles, without requiring new physics beyond the Standard Model and Gravity. The gravitational Chern–Simons structure and its anomaly with neutrinos force a topological Higgs mechanism, leading to neutrino condensation via S4/ZN gravitational instantons. The number of topological degrees of freedom N∼MP2/Λ∼10120 provides both the holographic counting of the de Sitter entropy and a 1/Ninformation see-saw mechanism for neutrino masses. Our framework makes the following predictions: (i) a neutrino superfluid condensation forming Cooper pairs below meV energies, as a viable candidate for cold dark matter; (ii) a possible resolution of the strong CP problem through a QCD composite axion state; (iii) time-varying neutrino masses which track the evolution of dark energy; and (iv) several distinctive signatures in astroparticle physics, ultra-high-energy cosmic rays and high magnetic field experiments. Full article
(This article belongs to the Special Issue Selected Papers from XXVIII Workshop “What Comes Beyond the Standard Models?”: New Trends in Particle Cosmology)
13 pages, 320 KB  
Article
Structure of the Baryon Halo Around a Supermassive Primordial Black Hole
by Boris Murygin, Viktor Stasenko and Yury Eroshenko
Particles 2024, 7(4), 1004-1016; https://doi.org/10.3390/particles7040061 - 13 Nov 2024
Cited by 1 | Viewed by 1594
Abstract
According to some theoretical models, primordial black holes with masses of more than 108 solar masses could be born in the early universe, and their possible observational manifestations have been investigated in a number of works. Dense dark matter and baryon halos [...] Read more.
According to some theoretical models, primordial black holes with masses of more than 108 solar masses could be born in the early universe, and their possible observational manifestations have been investigated in a number of works. Dense dark matter and baryon halos could form around such primordial black holes even at the pre-galactic stage (in the cosmological Dark Ages epoch). In this paper, the distribution and physical state of the gas in the halo are calculated, taking into account the radiation transfer from the central accreting primordial black hole. This made it possible to find the ionization radius, outside of which there are regions of neutral hydrogen absorption in the 21 cm line. The detection of annular absorption regions at high redshifts in combination with a central bright source may provide evidence of the existence of supermassive primordial black holes. We also point out the fundamental possibility of observing absorption rings with strong gravitational lensing on galaxy clusters, which weakens the requirements for the angular resolution of radio telescopes. Full article
(This article belongs to the Special Issue Selected Papers from XXVIII Workshop “What Comes Beyond the Standard Models?”: New Trends in Particle Cosmology)
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