News
EPJ Plus Focus Point Issue: Mathematics and Physics at the Quantum-Classical Interface
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- Published on 29 May 2026
Guest Editors: Denys I. Bondar, Ilon Joseph, Giuseppe Marmo, Cesare Tronci
The study of the quantum-classical interface has been leading to new horizons in the fundamental understanding of many-body quantum systems as well as the control of quantum systems through the steering of classical components. The study of this area requires a combination of different approaches in both mathematics and physics, thereby forming an ideal platform for the rise of new concepts and methods in both fields and beyond. Given the intrinsic interdisciplinary aspects accompanying the study of the quantum-classical divide, this focus point brings together communities with different expertise in order to approach and advance problems lying across this interface. It is clear that standard methods in quantum mechanics are not sufficient to tackle this kind of problems, nor can classical mechanics alone resolve the underlying issues. There must be a synergy between different fields and this focus point has been seeking to accelerate new approaches and new collaborations along these lines. Achieving this synergy requires breaking language barriers and considering concepts that may be far from standard viewpoints. This focus point signifies the fact that the community is ready to embark on such a challenge by bringing together – once again – both mathematics and physics.
All articles are available here and are freely accessible until 31 July 2026. For further information, read the Editorial.
EPJ A Topical Collection: Nuclear Physics in Astrophysics
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- Published on 28 May 2026
Guest Editors: Daniel Bemmerer, David Blaschke, Oleksii Ivanytskyi, Eliana Masha, Marie Pichotta, Konrad Schmidt and Matthias Steffen
Nuclear Physics in Astrophysics studies the production of the chemical elements in astrophysical scenarios ranging from primordial nucleosynthesis to stellar explosions and mergers. This field has seen impressive progress in recent years, both in theory and experiment, as evidenced by the Nuclear Physics in Astrophysics conference series. This Topical Collection assembles invited contributions drawn from the Nuclear Physics in Astrophysics XI (NPA-XI) conference in Dresden in September 2024, as well as additional papers invited by the Guest Editors. They cover the following four thematic areas: cosmic nucleosynthesis, element synthesis processes in stars, latest stages of stellar evolution, and special topics. A short review of new European facilities for nuclear astrophysics is given, from the FAIR facility in Darmstadt to underground ion accelerators to accelerator mass spectrometers.
All articles are available here and are freely accessible until 20 July 2026. For further information, read the Editorial.
EPJ Plus Highlight - Speeding up radioactive decay in ultra-cold metallic environments
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- Published on 21 May 2026
A new framework aims to test whether embedding radioactive nuclei in ultra-cold metal matrices could accelerate their decay, and could offer a new route to managing nuclear waste
When cooled to ultra-cold temperatures and embedded in metallic surroundings, radioactive nuclei may decay at faster rates. So far, however, the mechanisms underlying this possibility have remained poorly understood.
Through new research published in EPJ Plus, a team from the Italian National Institute for Nuclear Physics (INFN) and the Tor Vergata University of Rome, in collaboration with the Institute for Nuclear Research of (NASU) in Kyiv, has developed a comprehensive new framework for assessing the effect, and how it can best be investigated in real experiments. Their results could lead to new answers in fundamental nuclear physics and may even pave the way for new methods for accelerating the decay of radioactive waste into less harmful materials.
EPJ Web of Conferences Highlight - XXXI International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions “Quark Matter 2025”
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- Published on 20 May 2026
The Quark Matter 2025, held in Frankfurt from April 6–12, 2025, is the largest global conference in the field of high-energy heavy-ion physics. It brings together leading experimentalists and theorists to explore the properties of matter under extreme conditions, such as those that existed just after the Big Bang.
The 2025 edition attracted around 1000 participants from across the world, making it the largest meeting in the conference series to date. The scientific program featured a very large number of contributions, including hundreds of talks and poster presentations spanning topics such as quark–gluon plasma, particle correlations, jets, and new detector technologies.
Olle Björneholm joins the EPJ Scientific Advisory Committee (SAC)
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- Published on 20 May 2026
The Steering Committee of EPJ is delighted to welcome Olle Björneholm, as the new representative of the Swedish Physical Society.
Professor Olle Björneholm is professor in Molecular and Cluster Physics in the Chemical and Bio-molecular Physics research program within the Division for X-ray Photon Science at the Department of Physics and Astronomy (Uppsala University). His personal research interests are primarily concerned with phenomena and processes connected to the electronic and geometric structure of liquids and clusters/nanoparticles including X-ray-induced dynamics as described here. His main tools to study this are various synchrotron radiation-based spectroscopic techniques. He studies systems and processes that are relevant for issues like ultra-fast dynamics radiation damage nanoscience and environmental molecular science.
EPJ E Colloquium - Human lungs fluid mechanics: an overview of current modelling techniques
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- Published on 13 May 2026
Human breathing is governed by fluid mechanics across several regimes that span over a wide range of length and time scales: from turbulent airflow in the upper airways to slow interfacial motion in the smallest bronchioles and alveoli. At the same time, air motion is coupled to deformable tissue, mucus transport, surfactant dynamics, gas exchange, and, in disease, airway narrowing or liquid plugging. This makes the lung a demanding test case for modern multiphysics modelling.
EPJ ST Highlight - Improved technique could reveal beyond standard model particles in CERN detector
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- Published on 13 May 2026
A technique combining liquid thin films and machine vision could help researchers cut through the optical noise obscuring potential tracks of as-yet unobserved particles in CERN's MoEDAL detector
The Monopole and Exotics Detector at the LHC (MoEDAL) is an experiment at CERN's Large Hadron Collider (LHC), which is aiming to observe a variety of particles not described by the Standard Model. So far, however, the scope of its measurement abilities has been held back by the techniques used to measure the tracks left behind by energetic particles.
In a new study published in EPJ Special Topics (EPJ ST), Matti Kalliokoski at the University of Helsinki, Finland, presents a new approach to processing the foil used in this measurement. His method could make it far easier for researchers to detect the subtle tracks left behind by as-yet unobserved particles – potentially bringing their long-awaited measurement a step closer to reality.
EPJ E Highlight - EPJ E: Soft Matter and Biological Physics – the past and the future
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- Published on 08 May 2026
A new editorial in EPJ E reflects on the journal’s role in uniting diverse soft-matter communities, and anticipates the challenges of maintaining interdisciplinary dialogue as the field expands.
Soft matter encompasses a diverse array of structures, including liquid crystals, polymers and biopolymers, and even living cells and tissues. While they are often complex, all of these materials display extremely strong responses to weak perturbations, including mechanical, chemical, and electrical influences. Increasingly, these properties are being explored across a vast array of applications, driving deeper questions about how the fascinating behaviour of soft materials is linked to their constituent molecular parts.
First founded in 2000, EPJ E: Soft Matter and Biological Physics has long been a cornerstone of soft matter research. In one of the first papers of the EPJ E 25th Anniversary Collection: Past Insights, Present Voices, Future Horizons, Jean‑François Joanny at Collège de France, together with Günter Reiter at Albert-Ludwigs-Universität Freiburg, reflect on its prolific past while anticipating the challenges and opportunities it will likely face in the future.
EPJ Plus Highlight - Morphology shapes the performance of perovskite X-ray detectors
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- Published on 08 May 2026
Researchers have identified a key trade-off between the thickness and the quality of the film of hybrid perovskite devices and their performance in flexible X-ray detectors
Thin films of hybrid perovskites have emerged as promising candidates for optoelectronic devices, including radiation detectors, but much remains to be learned about how their performance is linked to their morphology.
Through new analysis published in EPJ Plus, Sara Cepić and colleagues at the University of Bologna, Italy, have gained detailed insights into the link between film morphology and the performance of a perovskite-based X-ray detector. Their results could help researchers in future studies to optimise the performance of radiation detectors.
EPJ H Highlight - From Hole Theory to Quantum Field Theory
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- Published on 08 May 2026
New analysis reconstructs a pivotal transition in physicists' understanding of fermionic quantum fields, tracing how Ettore Majorana's largely overlooked 1937 work helped shape the modern framework of Quantum Field Theory
Since its earliest origins in the 1920s, Quantum Field Theory (QFT) has come to underpin our understanding of the universe's most fundamental particles and forces. Among the most important stages in its development was a period from 1933 to 1937, when relativistic fermions were widely studied in the context of Dirac's Hole theory – which suggested that a vacuum exists as a 'sea' of negative energy states, each fully occupied by an electron. As this framework was gradually superseded, QFT began its gradual and consistent construction.
Through new analysis published in EPJ H: Historical Perspectives on Contemporary Physics, Francesco Vissani at The National Institute for Nuclear Physics (INFN), Italy, reconstructs the crucial stages of this transition, highlighting the seminal role played by Italian theorist Ettore Majorana.
