Quantum field theory (QFT) is a research area in theoretical physics that formulates fundamental interactions in terms of quantized fields defined over spacetime, unifying special relativity and quantum mechanics. It treats particles as excitations of underlying fields and employs operator- or path-integral-based frameworks to compute scattering amplitudes, correlation functions, and vacuum structure. QFT underpins the Standard Model of particle physics, gauge theories, and renormalization methods, and provides the language for describing phenomena such as spontaneous symmetry breaking, anomalies, and topological phases. Research in QFT also interfaces with quantum gravity, conformal field theory, and nonperturbative techniques such as lattice formulations and bootstrap approaches.
Nuclear physicists have long been working to reveal how the proton gets its spin. Now, a new method that combines experimental data with state-of-the-art calculations has revealed a more detailed picture of spin contributions ...
General Physics
May 24, 2024
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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 ...
Quantum Physics
May 17, 2024
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179
Gravity is one of four fundamental interactions. The most precise description of this force is still provided by Einstein's General Theory of Relativity, published in 1915, an entirely classical theory. This description sets ...
General Physics
May 7, 2024
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A breakthrough in theoretical physics is an important step toward predicting the behavior of the fundamental matter of which our world is built. It can be used to calculate systems of enormous quantities of quantum particles, ...
Condensed Matter
Apr 4, 2024
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423
A team of scientists from Columbia, Nanjing University, Princeton, and the University of Munster, writing in the journal Nature, have presented the first experimental evidence of collective excitations with spin called chiral ...
Condensed Matter
Mar 28, 2024
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Several thousand sensors distributed over a square kilometer near the South Pole are tasked with answering one of the large outstanding questions in physics: does quantum gravity exist? The sensors monitor neutrinos—particles ...
General Physics
Mar 26, 2024
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896
Entanglement is what Einstein called "spooky action at a distance." It is a key part of what distinguishes quantum mechanics from our everyday experience. In quantum mechanics, scientists use a measurement called entanglement ...
General Physics
Mar 25, 2024
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186
Dirac electrons were predicted by P. Dirac and discovered by A. Geim, both of whom were awarded the Nobel Prize in Physics in 1933 and in 2010, respectively. Dirac electrons behave like photons rather than electrons, for ...
Condensed Matter
Mar 14, 2024
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2513
An international research team has successfully conducted ultra-precise X-ray spectroscopic measurements of helium-like uranium. The team, which includes researchers from Friedrich Schiller University Jena and the Helmholtz ...
General Physics
Jan 25, 2024
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97
The full, weird story of the quantum world is much too large for a single article, but the period from 1905, when Einstein first published his solution to the photoelectric puzzle, to the 1960s, when a complete, well-tested, ...
Quantum Physics
Dec 29, 2023
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