photon
Let an agent explain the photon and its properties, relay its role in quantum theory and electromagnetism from physics references, describe applications and specialised terms, and distinguish established physics from speculative uses such as biophoton claims.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent explain the photon and its properties, relay its role in quantum theory and electromagnetism from physics references, describe applications and specialised terms, and distinguish established physics from speculative uses such as biophoton claims.
The elementary particle that is the quantum of the electromagnetic field and the carrier of the electromagnetic force, massless, chargeless, travelling at the speed of light and carrying energy proportional to its frequency, exhibiting both wave and particle behaviour; photons make up all light and other electromagnetic radiation, from radio to gamma rays, with virtual photons mediating interactions in quantum electrodynamics, soft photons at low energy, Lyman continuum photons in astrophysics and the contested term biophoton for weak light emitted by living tissue.
What it is for: Not applicable; a fundamental particle.
It can be explain properties and behaviour; relay quantum theory and QED; describe applications; distinguish specialised and speculative terms.
Distinguishing features
Massless gauge boson
Wave-particle duality
Energy from frequency
Carrier of electromagnetism
What it looks like
Not visible as an object; perceived as light.
Physical character
rest mass: 0 kg - exactly, by theory
spin: 1 h-bar
energy: E = h * nu formula - Planck relation
speed in vacuum: 299792458 m/s
How it is recognised
Quantum of the electromagnetic field
Real, virtual, soft, Lyman continuum photons
Electrons are charged fermions; gluons carry the strong force; phonons are lattice vibrations
Related models
is a kind of - in registry terms
is a kind of - in registry terms
is a kind of - in registry terms
mediates - in the Standard Model
In practice
Families and kinds
photons across the electromagnetic spectrum
virtual photons in QED
soft photons in scattering theory
Lyman continuum photons in astrophysics
entangled photons in quantum optics
biophoton as a term for ultraweak biological emission, with contested interpretations
Identifiers
PDG photon Particle Data Group listing
Standards and regulation
No regulation; SI definitions involving the speed of light and Planck constant
Failure modes and hazards
Misusing photon concepts in pseudoscience
Confusing wave and particle pictures
Overstating biophoton claims
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What a photon is.
Science.
Definition
Definition and properties.
Definition
Definition.
- What is a photon, and what are its mass, spin, energy and momentum? definition
- Is the question about photons in physics or a speculative use of the term? boundary
Duality
Wave and particle.
Duality
Duality.
- How do photons show wave and particle behaviour, as in the photoelectric effect and interference? definition
- Which entry fits wave-particle duality? action
Theory Theory.
Science.
QED
Quantum electrodynamics.
QED
QED.
- What roles do real and virtual photons play in quantum electrodynamics and the Standard Model? provenance
- Which references are standard? provenance
Special
Specialised terms.
Special
Special.
- What are soft photons, Lyman continuum photons and biophotons, and how established is each concept? provenance
- Is the presentation clear about contested claims? boundary
Apply Applications.
Application.
Technology
Photonics.
Technology
Technology.
- How are photons used in lasers, fibre optics, imaging and detectors? provenance
- Which entry fits photonics? action
Quantum
Quantum technologies.
Quantum
Quantum.
- How are entangled photons used in quantum communication and computing, as research reports? provenance
- Which sources are cited? provenance
Context History.
Context.
History
History of the concept.
History
History.
- How did Planck, Einstein and later physicists develop the photon concept, and where does the name come from? provenance
- Which entry fits the history of quantum mechanics? action
Experiments
Key experiments.
Experiments
Experiments.
- What experiments established the photon, from the photoelectric effect to single-photon interference? provenance
- Which entry fits the specific experiment? action
What the second pass must settle
- Should quantum optics be the primary linked entry for applications?
- How should physics references be linked?
- The registry entry has merged aliases including a contested term; should they be split off?