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   What is quantum electrodynamics (QED)?

   • Quantum electrodynamics (QED) is the best-tested theory we have [1–4]. It is a quantum field theory which describes the gauge invariant interaction of charged particles with photons. With this theory one is able to describe high precision experiments like the Lamb shift and the magnetic moments of the electron and muon with great accuracy.

   Quantum Electrodynamics - an overview | ScienceDirect Topics

   www.sciencedirect.com/topics/physics-and-astronomy/quantum-electrodynamics

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   What does QED stand for?

   • They write new content and verify and edit content received from contributors. quantum electrodynamics (QED), quantum field theory of the interactions of charged particles with the electromagnetic field. It describes mathematically not only all interactions of light with matter but also those of charged particles with one another.

   Quantum electrodynamics (QED) | Britannica

   www.britannica.com/science/quantum-electrodynamics-physics

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   What is QED physics?

   • In technical terms, QED can be described as a very accurate way to calculate the probability of the position and movement of particles, even those massless such as photons, and the quantity depending on position (field) of those particles, and described light and matter beyond the wave-particle duality proposed by Albert Einstein in 1905.

   Quantum electrodynamics - Wikipedia

   en.wikipedia.org/wiki/Quantum_electrodynamics

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   What is QED theory?

   • It describes mathematically not only all interactions of light with matter but also those of charged particles with one another. QED is a relativistic theory in that Albert Einstein’s theory of special relativity is built into each of its equations.

   Quantum electrodynamics (QED) | Britannica

   www.britannica.com/science/quantum-electrodynamics-physics

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   Why is QED important?

   • It was used to precisely model some quantum phenomena which had no classical analogs, such as the Lamb shift and the anomalous magnetic moment of the electron. QED was the first successful quantum field theory, incorporating such ideas as particle creation and annihilation into a self-consistent framework.

   Quantum Electrodynamics (QED) - HyperPhysics

   hyperphysics.phy-astr.gsu.edu/hbase/Forces/qed.html

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   What is quantum electrodynamics in particle physics?

   • In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved.

   Quantum electrodynamics - Wikipedia

   en.wikipedia.org/wiki/Quantum_electrodynamics

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2. en.wikipedia.org › wiki › Quantum_electrodynamicsQuantum electrodynamics - Wikipedia

   en.wikipedia.org › wiki › Quantum_electrodynamics

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   In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. [1][2][3] In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved. [2]

3. physics.info › qedQuantum Electrodynamics – The Physics Hypertextbook

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   Quantum electrodynamics is the modern theory of electricity, magnetism, and light. The use of Feynman diagrams to describe particle interactions started here.

4. www.britannica.com › science › quantumQuantum electrodynamics (QED) | Britannica

   www.britannica.com › science › quantum

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   quantum electrodynamics (QED), quantum field theory of the interactions of charged particles with the electromagnetic field. It describes mathematically not only all interactions of light with matter but also those of charged particles with one another.

   • Author: The Editors of Encyclopaedia Britannica

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6. www.sciencedirect.com › topics › physics-andQuantum Electrodynamics - an overview | ScienceDirect Topics

   www.sciencedirect.com › topics › physics-and

   Quantum Electrodynamics (QED) is defined as the most successful quantum field theory, particularly applied to simple atoms, enabling highly accurate theoretical predictions and precise experimental measurements in the field of precision physics.

7. www-thphys.physics.ox.ac.uk › people › FrancescoHautAn Introduction to QED & QCD - University of Oxford ...

   www-thphys.physics.ox.ac.uk › people › FrancescoHaut

   These lectures present a heuristic introduction to gauge theories of electromagnetic and strong interactions, focusing on perturbative applications of the S matrix and the use of Feynman graphs in QED and QCD. They are complementary to the presentations of field theory in the Standard Model and Quantum Field Theory courses at this School.

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8. hyperphysics.phy-astr.gsu.edu › hbase › ForcesQuantum Electrodynamics (QED) - HyperPhysics

   hyperphysics.phy-astr.gsu.edu › hbase › Forces

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   Quantum electrodynamics, commonly referred to as QED, is a quantum field theory of the electromagnetic force. Taking the example of the force between two electrons, the classical theory of electromagnetism would describe it as arising from the electric field produced by each electron at the position of the other.

9. www.sciencenews.org › article › quantum-theory-qedA pivotal quantum theory holds up even in extreme electric fields

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   Jan 31, 2024 · Quantum electrodynamics, or QED, looms large in physics. It’s an integral part of the standard model of particle physics, the theory of fundamental particles and their interactions. So...