Special Issues

Universe publishes Special Issues to create collections of papers on specific topics, with the aim of building a community of authors and readers to discuss the latest research and develop new ideas and research directions. Special Issues are led by Guest Editors, who are experts on the topic and all Special Issue submissions follow MDPI's standard editorial process. The journal’s Editor-in-Chief and/or designated Editorial Board Member will oversee Guest Editor appointments and Special Issue proposals, checking their content for relevance and ensuring the suitability of the material for the journal. The papers published in a Special Issue will be collected and displayed on a dedicated page of the journal’s website. Further information on MDPI's Special Issue polices and Guest Editor responsibilities can be found here. For any inquiries related to a Special Issue, please contact the Editorial Office.

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New Insights into High-Energy Astrophysics, Galaxies, and Cosmology—Celebrating the 10th Anniversary of the Re-establishment of the Department of Astronomy at Xiamen University (2012–2022)
edited by Taotao Fang, Weimin Gu, Tong Liu and Beibei Liu
submission deadline 15 Dec 2024 | 5 articles | Viewed by 3120 | Submission Open
Keywords: compact objects; exoplanets; interstellar medium; galaxies; active galactic nuclei; cosmology; large-scale structures; time-domain astronomy
Gravity and Cosmology: Exploring the Mysteries of f(T) Gravity
edited by , Hemily Gomes Marciano Fortes and
submission deadline 20 Dec 2024 | Viewed by 508 | Submission Open
Keywords: gravity; general relativity; teleparallel theory; torsion; extended teleparallel theory; cosmology; compact stars
(This special issue belongs to the Section Gravitation)
Primordial Black Holes from Inflation
edited by
submission deadline 31 Dec 2024 | 7 articles | Viewed by 20904 | Submission Open
Keywords: primordial black holes  ; inflation  ; statistics  ; gravitational collapse
(This special issue belongs to the Section Compact Objects)
Universe: Feature Papers 2024 – Compact Objects
edited by
submission deadline 31 Dec 2024 | 9 articles | Viewed by 9727 | Submission Open
Keywords: compact object; neutron star; pulsar; magnetar; white dwarf; black hole; X-ray binary
(This special issue belongs to the Section Compact Objects)
Recent Advances in Gravity: A Themed Issue in Honor of Prof. Jorge Pullin on His 60th Anniversary
edited by
submission deadline 31 Dec 2024 | 5 articles | Viewed by 7708 | Submission Open
Keywords: loop quantum gravity; black holes; foundations of quantum mechanics; numerical relativity; problem of time
(This special issue belongs to the Section Gravitation)
Recent Outcomes and Future Challenges in Nuclear Astrophysics submission deadline 31 Dec 2024 | 5 articles | Viewed by 6936 | Submission Open
Keywords: nuclear astrophysics; astroparticle physics; experimental techniques; BBN; stellar evolution; stellar explosion; observational astronomy
(This special issue belongs to the Section Solar and Stellar Physics)
Universe: Feature Papers 2024—'Cosmology' submission deadline 31 Dec 2024 | 7 articles | Viewed by 6650 | Submission Open
Keywords: cosmological models; quantum cosmology; dark matter and dark energy; cosmic acceleration; cosmological constants; cosmological perturbation theory; cosmic microwave background (CMB); observational cosmology
(This special issue belongs to the Section Cosmology)
Universe: Feature Papers 2024—"Galaxies and Clusters"
edited by
submission deadline 31 Dec 2024 | 5 articles | Viewed by 6229 | Submission Open
Keywords: galaxies and clusters; galaxy formation and evolution; the structure of galaxies; dwarf galaxies; star formation in galaxies; galaxy clustering; the halo of galaxies; galaxy satellites; dark matter in galaxies; lensing of galaxies; deep surface brightness images; galaxy counts; machine learning and artificial intelligence for galaxy/cluster analysis
(This special issue belongs to the Section Galaxies and Clusters)
Exotic Scenarios for Compact Astrophysical Objects
edited by , and Martin Veselsky
submission deadline 31 Dec 2024 | 2 articles | Viewed by 2478 | Submission Open
Keywords: compacts objects; neutron stars; hybrid stars; strange quark stars; boson stars; white dwarfs; dark objects
(This special issue belongs to the Section Compact Objects)
Comets: Tracers of Solar System Formation and Evolution—Celebrating the 20th Anniversary of Rosetta Mission Launch
edited by
submission deadline 31 Dec 2024 | 1 articles | Viewed by 2269 | Submission Open
Keywords: comets; protoplanetary disks; space missions/Rosetta; planetary formation; dust and pebble dynamics; cometary ices
(This special issue belongs to the Section Planetary Sciences)
Cosmic Rays and Dark Matter Detection
edited by , and Sami Caroff
submission deadline 31 Dec 2024 | 1 articles | Viewed by 2220 | Submission Open
Keywords: cosmic ray; dark matter; photons; neutrino; axion; black hole; WIMP; astroparticle; solar modulation; Cerenkov detectors
(This special issue belongs to the Section Space Science)
The Local Group in Multi-Dimensions submission deadline 31 Dec 2024 | Viewed by 437 | Submission Open
Keywords: local group; resolved stellar populations; galaxy evolution; galaxy groups; Milky Way; M31; dwarf galaxies
(This special issue belongs to the Section Galaxies and Clusters)
New Results from Gravitational Wave Detectors
edited by Mengyao Wang and
submission deadline 31 Dec 2024 | Viewed by 190 | Submission Open
Keywords: gravitational wave; instrumentation; detector designs and techniques
(This special issue belongs to the Section Compact Objects)
New Frontiers in Particle Physics with Quantum Sensing
edited by
submission deadline 31 Dec 2024 | Viewed by 170 | Submission Open
Keywords: particle physics; new physics; dark matter search; quantum sensing; new detection techniques
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
keV Warm Dark Matter (ΛWDM) in Agreement with Observations in Tribute to Héctor J. de Vega (2nd Edition)
edited by
submission deadline 15 Jan 2025 | Viewed by 298 | Submission Open
Keywords: keV warm dark matter; keV warm dark matter theory; constraints; and observations; keV warm dark matter galaxies; keV warm dark matter supermassive black holes; keV warm dark matter particles; keV warm dark matter (direct and indirect) detection; neutrinos and sterile neutrinos; dark matter production models; direct and indirect searches
(This special issue belongs to the Section Gravitation)
Exploring the Heavy Ion Collisions in Particle Physics submission deadline 31 Jan 2025 | Viewed by 204 | Submission Open
Keywords: quark– gluon plasma; hadron resonance; partonic interactions; heavy ion collisions; particle physics; (anti)nuclei formation; physics beyond QCD; detector development; theoretical models
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
CP Violation and Flavor Physics submission deadline 28 Feb 2025 | 4 articles | Viewed by 5690 | Submission Open
Keywords: CP violation; flavor physics; flavor puzzle; strong CP problem; flavor symmetries; spontaneous CP violation; baryogenesis; leptogenesis
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
Origins and Natures of Inflation, Dark Matter and Dark Energy, 2nd Edition
edited by
submission deadline 28 Feb 2025 | 4 articles | Viewed by 3688 | Submission Open
Keywords: inflation; dark matter; dark energy; alternative theory of gravity; cosmology; physics in the early universe; cosmological perturbation theory; cosmic microwave background radiation; gravitational waves; large-scale structure of the universe
(This special issue belongs to the Section Cosmology)
Particle Physics and Cosmology: A Themed Issue in Honor of Professor Dimitri Nanopoulos
edited by , , Tianjun Li and Natsumi Nagata
submission deadline 28 Feb 2025 | 4 articles | Viewed by 3582 | Submission Open
Keywords: particle physics; supersymmetry; grand unified theory; string model building; cosmology
Quantum Field Theory, 2nd Edition
edited by
submission deadline 28 Feb 2025 | 3 articles | Viewed by 2881 | Submission Open
Keywords: ultralight axions; Peccei– Quinn at finite temperature; spectral densities; mixing of Yang– Mills theories; electroweak symmetry breaking; coarse-graining of Euclidean field theory gradient flow cooling
(This special issue belongs to the Section Foundations of Quantum Mechanics and Quantum Gravity)
Neutrino Insights: Peering into the Subatomic Universe
edited by Guillermo D. Megias
submission deadline 28 Feb 2025 | 1 articles | Viewed by 970 | Submission Open
Keywords: neutrino physics; neutrino oscillations; electroweak interactions; CP violation; solar and atmospheric neutrinos; long-baseline accelerators; neutrino-nucleus reactions; low and high energy neutrinos
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
Compact Stars in the QCD Phase Diagram 2024
edited by , Toru Kojo, Hajime Sotani and Hajime Togashi
submission deadline 28 Feb 2025 | Viewed by 122 | Submission Open
Keywords: neutron stars; neutron star mergers; supernovae; warm; dense QCD; heavy-ion collisions
(This special issue belongs to the Section Compact Objects)
X-ray Astronomy Steps into the 21st Century: Chandra and XMM-Newton at 25
edited by
submission deadline 15 Mar 2025 | Viewed by 393 | Submission Open
Keywords: X-ray astrophysics; high-resolution X-ray imaging; diffraction grating X-ray spectroscopy; active galaxies; X-ray binaries; supernova remnants; normal galaxies; galaxy clusters
(This special issue belongs to the Section Space Science)
Quantum Field Theory in Curved Spacetime and Its Implications for Cosmology, Blackholes and Quantum Gravity submission deadline 20 Mar 2025 | 8 articles | Viewed by 11684 | Submission Open
Keywords: quantum field theory in curved spacetime; quantum gravity; blackholes; cosmology
(This special issue belongs to the Section Foundations of Quantum Mechanics and Quantum Gravity)
Exploring Double Beta Decay: Probing Fundamental Properties of Neutrinos and Beyond
edited by
submission deadline 31 Mar 2025 | 1 articles | Viewed by 565 | Submission Open
Keywords: experimental and theoretical topics on double beta decay modes; low-background detectors and methodologies; nuclear matrix
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
Cosmological Models of the Universe submission deadline 1 Apr 2025 | 8 articles | Viewed by 7557 | Submission Open
Keywords: standard cosmological model; dark matter; dark energy; bounce cosmology; inflation cosmology; Λ CDM-cosmology; anisotropic cosmology
(This special issue belongs to the Section Cosmology)
Ultra-High-Energy Cosmic Rays
edited by Haoning He
submission deadline 1 Apr 2025 | 1 articles | Viewed by 1265 | Submission Open
Keywords: high energy neutrino; high energy gamma-ray; ultra-high-energy cosmic rays; particle acceleration; hadronic interactions; anisotropy; composition; multi-messenger astronomy; magnetic fields; Gamma-Ray Bursts (GRBs); galaxy clusters; Active Galactic Nuclei (AGN); Tidal Disruption Events (TDEs); radio galaxies; starburst galaxies; pulsars
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
Studies of Hadron Spectroscopy at the Future Electron-Hadron and Electron-Ion Colliders
edited by Vladimir Khachatryan and Wenliang Li
submission deadline 15 Apr 2025 | Viewed by 237 | Submission Open
Keywords: quantum chromodynamics; electron scattering; electron-hadron colliders; hadron spectroscopy; conventional & non-conventional hadronic states; photo & electroproduction processes; exclusive & inclusive processes; fragmentation & hadronization
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
Planetary Radar Astronomy
edited by and Yan Su
submission deadline 25 Apr 2025 | 2 articles | Viewed by 3111 | Submission Open
Keywords: radar astronomy; lunar and planetary science; lunar and planetary radar detection; lunar and deep space exploration; radar observations of planets within the solar system; radar observations of planets and stars outside the solar system; Chang’ e-3/-4/-5; Tianwen-1 mission and perseverance rover mission; fast radio bursts magnetar radio emission; radio astronomy; multi-messenger observations
(This special issue belongs to the Section Planetary Sciences)
New Discoveries in Astronomical Data
edited by Yanxia Zhang and
submission deadline 30 Apr 2025 | 5 articles | Viewed by 8909 | Submission Open
Keywords: machine learning in astronomy; discoveries: from radio to gamma-rays; deep learning; astrostatistics and astroinformatics; data analysis: methods; statistical: astronomical data bases
(This special issue belongs to the Section Astroinformatics and Astrostatistics)
Current Status of the Hubble Tension
edited by , and Nakia Carlevaro
submission deadline 30 Apr 2025 | 3 articles | Viewed by 2655 | Submission Open
Keywords: Hubble tension; dark matter; dark energy; dark matter/dark energy interaction; quintessence; late universe physics; cosmology from modified gravity; early universe dark energy; model testing; data analysis
(This special issue belongs to the Section Cosmology)
Recent Advances in Gravitational Lensing and Galactic Dynamics submission deadline 30 Apr 2025 | 2 articles | Viewed by 1227 | Submission Open
Keywords: gravitational lensing; weak lensing; astrophysics of black holes and neutron stars; gravitational waves; astrophysical tests of general relativity; relativistic astrophysics; galactic dynamics; JWST; EHT; and Euclid observations; exoplanets
(This special issue belongs to the Section Gravitation)
Dark Energy and Dark Matter
edited by Yan Gong
submission deadline 16 May 2025 | 6 articles | Viewed by 6836 | Submission Open
Keywords: dark energy; dark matter; modified gravity; theoretical model; cosmic acceleration; cosmic large-scale structure; gravitational lensing; galaxy clustering; intensity mapping; cosmological constraint
(This special issue belongs to the Section Cosmology)
Measurements, Observations and Theoretical Studies on the Solar Magnetic Field—Celebrating the 40th Anniversary of the Huairou Solar Observing Station
edited by , Mei Zhang, Junfeng Hou, Jiaben Lin and
submission deadline 16 May 2025 | 3 articles | Viewed by 2532 | Submission Open
Keywords: solar magnetic field; solar polarimetry; multi-wavelength diagnostic; topology analysis; astroinformatics; MHD; solar dynamo; space weather forecasting; solar historical data; space projects
(This special issue belongs to the Section Solar and Stellar Physics)
Current Trends in Neutrino Oscillation Physics: A Phenomenological and Experimental Perspective
edited by and Budimir Kliček
submission deadline 20 May 2025 | 1 articles | Viewed by 954 | Submission Open
Keywords: neutrino oscillation; three flavour oscillation; beyond three flavour oscillation; models for neutrino mass and mixing; neutrino experiments; neutrino detectors; neutrino interactions
Probing the Early Universe
edited by
submission deadline 31 May 2025 | 3 articles | Viewed by 3528 | Submission Open
Keywords: the Planck era (t < 10-43  s); grand unification era (t < 10-36  s); the inflationary era (t < 10-33  s); electroweak epoch (10-33  s < t < 10-12  s); quark era (10-12  s < t < 10-5  s); hadron era (10-5  s < t < 1 s); lepton era with neutrino decoupling (1 s < t < 10 s); cosmic nucleosynthesis (10 s < t < 1000 s); radiation dominated and ‘ foggy’ era (1000 s < t < 380; 000 years); recombination (18; 000 years < t < 380; 000 years); the dark era (380; 000 years < t < 150 million years); first stars and galaxies (200 to 400 million years); cosmic reionization (200 million to 1 billion years)
(This special issue belongs to the Section Cosmology)
A Multiwavelength View of Supernovae
edited by
submission deadline 31 May 2025 | Viewed by 341 | Submission Open
Keywords: supernovae; core collapse; type Ia; binaries; evolution; circumstellar interactions; emission processes; thermal and non-thermal emission
(This special issue belongs to the Section Solar and Stellar Physics)
Challenges and Synergies with Future Gravitational Wave Observatories
edited by Vetrugno Daniele and Riccardo Buscicchio
submission deadline 31 May 2025 | Viewed by 307 | Submission Open
Keywords: gravitational waves; LISA; ET; einstein telescope; cosmic explorer; global fit; stochastic gravitational waves background; multifrequency GW observation; GW observatories synergies; GW data analysis
(This special issue belongs to the Section Astroinformatics and Astrostatistics)
Modified Gravity and Dark Energy Theories
edited by Changjun Gao
submission deadline 31 May 2025 | Viewed by 117 | Submission Open
Keywords: dark energy; modified gravity theories; black hole solutions; exact solutions; black hole thermodynamics; nature of spacetime; black hole physics; gravitational waves in modified gravity theories
(This special issue belongs to the Section Gravitation)
Applications of Artificial Intelligence in Modern Astronomy
edited by Bo Qiu
submission deadline 31 May 2025 | Viewed by 111 | Submission Open
Keywords: artificial intelligence; machine learning; astronomy; deep learning; big data; telescope
(This special issue belongs to the Section Astroinformatics and Astrostatistics)
A Multimessenger View of Supermassive Black Holes and the Quasar Main Sequence submission deadline 1 Jun 2025 | 7 articles | Viewed by 12593 | Submission Open
Keywords: quasars; active galactic nuclei; supermassive black holes; quasar main sequence
(This special issue belongs to the Section Galaxies and Clusters)
Advances in Nuclear Astrophysics
edited by Ragandeep Singh Sidhu, Gavin Lotay and Jaspreet Singh Randhawa
submission deadline 15 Jun 2025 | Viewed by 275 | Submission Open
Keywords: nuclear astrophysics; observational astronomy; nuclear physics; stellar evolution; experimental techniques; fundamental properties
(This special issue belongs to the Section High Energy Nuclear and Particle Physics)
Loop Quantum Gravity and Non-Perturbative Approaches to Quantum Cosmology, Second Edition
edited by
submission deadline 20 Jun 2025 | 3 articles | Viewed by 2604 | Submission Open
Keywords: quantum gravity; non-perturbative approaches; planck scale; supergravity; non-commutative geometry; loop quantum gravity; loop quantum cosmology; string theory; emergent gravity; Horava-Lifshitz gravity
(This special issue belongs to the Section Cosmology)
Experimental and Observational Constraints on Wormhole Models
edited by João Luís de Figueiredo Rosa
submission deadline 20 Jun 2025 | Viewed by 149 | Submission Open
Keywords: wormholes; compact objects; experimental gravitational physics; model testing and constraining; exotic matter; modified theories of gravity; energy conditions
Studying Astrophysics with High-Energy Cosmic Particles
edited by Kinwah Wu and
submission deadline 30 Jun 2025 | 2 articles | Viewed by 2540 | Submission Open
(This special issue belongs to the Section Cosmology)
Variable Stars in the 21st Century: From Microvariability to Megavariability
edited by and Tamas Szalai
submission deadline 30 Jun 2025 | 1 articles | Viewed by 763 | Submission Open
Keywords: stellar variability; sky surveys; time-domain astrophysics; astrophysical transients; individual variable stars
(This special issue belongs to the Section Solar and Stellar Physics)
Tensions, Anomalies, and Challenges in the Standard Cosmological Model
edited by and Pavan Kumar Aluri
submission deadline 30 Jun 2025 | Viewed by 57 | Submission Open
Keywords: standard cosmological model— anomalies; tensions; challenges; cosmological principle; Hubble tension; S8 tension; dark matter and dark energy; early- and late-time probes
(This special issue belongs to the Section Cosmology)
The First Stars: Keys to Understanding Dark Matter
edited by
submission deadline 25 Jul 2025 | Viewed by 132 | Submission Open
Keywords: dark matter; first stars; early universe; WIMPs (weakly interacting massive particles); James Webb Space Telescope
(This special issue belongs to the Section Cosmology)
Multi-wavelength Properties of Active Galactic Nuclei
edited by
submission deadline 31 Jul 2025 | 1 articles | Viewed by 900 | Submission Open
Keywords: active galactic nuclei; black-hole physics; accretion; winds; jets; emission mechanism; theoretical modelling; observing facilities; software and databases
(This special issue belongs to the Section Galaxies and Clusters)
Advances in Studies of Galaxies at High Redshift
edited by Krisztina Éva Gabányi
submission deadline 31 Jul 2025 | Viewed by 115 | Submission Open
Keywords: high-redshift galaxies; active galaxies; quasars; supermassive black holes; star formation; galaxy evolution; early universe; cosmology; observational astronomy; simulations
(This special issue belongs to the Section Galaxies and Clusters)
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