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Symmetry
Special Issues
Matter and Antimatter Asymmetry in Cosmology and Particle Physics
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Matter and Antimatter Asymmetry in Cosmology and Particle Physics

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

Deadline for manuscript submissions: 30 June 2025 | Viewed by 547

Special Issue Editors

Dr. Luiz Garcia De Andrade

E-Mail Website
Guest Editor
1. Departamento de Física Teórica-IF-UERJ-Rua São Francisco Xavier 524, Maracanã, Rio de Janeiro, RJ 20550, Brazil
2. Institute for Cosmology and Philosophy of Nature, Trg, Florjana 16, 48260 Krizvic, Croatia
Interests: cosmology; particle physics; modified gravity
Prof. Dr. Zhifu Gao

E-Mail Website
Guest Editor
1. Xinjiang Astronomical Observatory, Chinese Academy of Sciences,150 Science 1-Street, Urumqi 830011, China
2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, West Beijing Road, Nanjing 210008, China
3. University of Chinese Academy of Sciences, No.19 Yuquan Road, Beijing 100049, China
Interests: magnetars; neutron stars; pulsars

Special Issue Information

Dear Colleagues,

Several lectures by specialists in the fields of cosmology and particle physics in terms of phenomenology are presented in this Special Issue. Special attention is given to the main subjects in modified theories of gravity such Einstein–Cartan theory with topological terms and the determination of the loop quantum gravity Barbero–Immirzi parameter and dynamical fields, as well as dark matter and dark energy.

This subject presents several ramifications in physical science such as modified gravity, TeV-scale particle physics, and pulsar astronomy. Neutrinos and antineutrinos can be emitted from pulsars as matter–antimatter pairs. In this Special Issue, we have gathered several specialists in the fields of QED, QCD, and loop quantum gravity.

Dr. Luiz Garcia De Andrade,
Prof. Dr. Zhifu Gao
Guest Editors

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
  • particle physics
  • modified gravity
  • pulsar astronomy
  • matter and antimatter
  • loop quantum gravity

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Published Papers (1 paper)

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Research

31 pages, 1438 KiB  
Article
FIMP Dark Matter in Bulk Viscous Non-Standard Cosmologies
by Esteban González, Carlos Maldonado, N. Stefanía Mite and Rodrigo Salinas
Symmetry 2025, 17(5), 731; https://doi.org/10.3390/sym17050731 - 9 May 2025
Viewed by 213
Abstract
In this paper, we revisit the extension of the classical non-standard cosmological model in which dissipative processes are considered through a bulk viscous term in the new field ϕ, which interacts with the radiation component during the early universe. Specifically, we consider [...] Read more.
In this paper, we revisit the extension of the classical non-standard cosmological model in which dissipative processes are considered through a bulk viscous term in the new field ϕ, which interacts with the radiation component during the early universe. Specifically, we consider an interaction term of the form Γϕρϕ, where Γϕ represents the decay rate of the field and ρϕ denotes its energy density and a bulk viscosity described by ξ=ξ0ρϕ1/2, within the framework of Eckart’s theory. This extended non-standard cosmology is employed to explore the parameter space for the production of Feebly Interacting Massive Particles (FIMPs) as Dark Matter candidates, assuming a constant thermal averaged Dark Matter production cross-section (⟨σv⟩), as well as a preliminary analysis of the non-constant case. In particular, for certain combinations of the model and Dark Matter parameters, namely (Tend,κ) and (mχ,⟨σv⟩), where Tend corresponds to the temperature at which ϕ decays, κ is the ratio between the initial energy density of ϕ and radiation, and mχ is the Dark Matter mass, we identify extensive new parameter regions where Dark Matter can be successfully established while reproducing the currently observed relic density, in contrast to the predictions of ΛCDM and classical non-standard cosmological scenarios. Full article
(This article belongs to the Special Issue Matter and Antimatter Asymmetry in Cosmology and Particle Physics)
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