About EPJ

The European Physical Journal (EPJ) is a series of peer-reviewed journals covering the whole spectrum of physics and related interdisciplinary subjects. EPJ is committed to high scientific quality in publishing and is indexed in all main citation databases.

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EPJ H Highlight - Tracing the history of perturbative expansion in quantum field theory

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Perturbative expansions enabled the development of the Standard Model. Source: https://upload.wikimedia.org/ wikipedia/commons/0/00/Standard_ Model_of_Elementary_Particles.svg

Contrary to long-standing assumptions, simplified descriptions of quantum systems have played a central role in shaping the foundations of quantum field theory.

Perturbative expansion is a valuable mathematical technique which is widely used to break down descriptions of complex quantum systems into simpler, more manageable parts. Perhaps most importantly, it has enabled the development of quantum field theory (QFT): a theoretical framework which combines principles from classical, quantum, and relativistic physics, and serves as the foundation of the Standard Model of particle physics.

Yet despite its importance in shaping our understanding of the universe, the role of perturbative expansion has often been understated when discussing the mathematical and philosophical foundations of QFT. Through new analysis published in EPJ H: Historical Perspectives on Contemporary Physics, James Fraser at the University of Wuppertal, together with Kasia Rejzner at the University of York, bring the special status of perturbative expansions into sharper focus, by highlighting their deep-rooted relationship with the foundations of QFT.

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EPJ Web of Conferences Highlight - CHEP2023: Computing in High Energy and Nuclear Physics

CHEP 2023 group photo in Norfolk, VA.

The 26th International Conference on Computing in High Energy and Nuclear Physics (CHEP), organized by Jefferson Lab, took place in Norfolk, Virginia, from 5–11 May 2023. The conference hosted roughly 600 registered participants from 28 different countries.

The CHEP conference series began in 1985 and has grown to become the largest of its kind, providing the unique opportunity for computing experts across particle and nuclear physics to come together and learn from each other.

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EPJ D Highlight - A new simple scheme for atom interferometry

The team’s setup consists of two parallel nano-structured slabs that reflect an incident matter beam three times. Credit: J. Fiedler, B. Holst, EPJ D (2024)

New scheme proposes a simpler method for investigating matter waves with an ease of use that could make it ideal for commercial applications

Atom interferometers are devices that use the wave characteristics of matter to measure the phase between atomic matter waves to separate paths to make high-precision measurements of elements of physics, such as gravitational and magnetic fields. Atom interferometers have also found their way into industry and are used in geological surveys, mineral exploration, environmental monitoring, and for the development of precision atomic clocks.

Atom interferometers usually control matter waves and particularly particle velocity using lasers. Thus, the growth of atom interferometer application has been strongly tied to the development of advanced laser systems, with many current models based on the construction of gratings fashioned from laser beams. That means that an issue with these systems is the fact that they depend on the efficient operation of intricate laser systems. Additionally, while this method has achieved commendable precision, it fails slightly when considering shorter wavelengths.

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