Quantum theory

Encyclopedia

**Quantum theory**may mean:

In science:

- Quantum mechanicsQuantum mechanicsQuantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. It departs from classical mechanics primarily at the atomic and subatomic...

: a subset of quantum physics explaining the physical behaviours at atomic and sub-atomic levels - Old quantum theoryOld quantum theoryThe old quantum theory was a collection of results from the years 1900–1925 which predate modern quantum mechanics. The theory was never complete or self-consistent, but was a collection of heuristic prescriptions which are now understood to be the first quantum corrections to classical mechanics...

under the Bohr model - Quantum field theoryQuantum field theoryQuantum field theory provides a theoretical framework for constructing quantum mechanical models of systems classically parametrized by an infinite number of dynamical degrees of freedom, that is, fields and many-body systems. It is the natural and quantitative language of particle physics and...

, a generic type of relativistic quantum theory, which includes:- Quantum electrodynamicsQuantum electrodynamicsQuantum electrodynamics 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 chromodynamicsQuantum chromodynamicsIn theoretical physics, quantum chromodynamics is a theory of the strong interaction , a fundamental force describing the interactions of the quarks and gluons making up hadrons . It is the study of the SU Yang–Mills theory of color-charged fermions...
- Electroweak interactionElectroweak interactionIn particle physics, the electroweak interaction is the unified description of two of the four known fundamental interactions of nature: electromagnetism and the weak interaction. Although these two forces appear very different at everyday low energies, the theory models them as two different...

- Quantum electrodynamics
- Quantum gravityQuantum gravityQuantum gravity is the field of theoretical physics which attempts to develop scientific models that unify quantum mechanics with general relativity...

, a general term for theories intended to quantize general relativity - Quantum opticsQuantum opticsQuantum optics is a field of research in physics, dealing with the application of quantum mechanics to phenomena involving light and its interactions with matter.- History of quantum optics :...

In popular culture:

- "Quantum Theory", the final song from
*Jarvis (album)*, by Jarvis CockerJarvis (album)Jarvis is the debut solo album by Pulp vocalist and musician Jarvis Cocker, released in the UK on November 13, 2006.-Production:... - Quantum Theory (video game)Quantum Theory (video game)Quantum Theory, is a third-person shooter video game for the PlayStation 3 and Xbox 360. It is developed by Team Tachyon and published by Tecmo. The game was released in September 2010....

is also the name of a console video game for PS3 and Xbox 360, released in 2010

## See also

- Introduction to quantum mechanicsIntroduction to quantum mechanicsQuantum mechanics is the body of scientific principles that explains the behavior of matter and its interactions with energy on the scale of atoms and atomic particles....
- Continuum theories, roughly opposite to quantum theories
- Quantum CognitionQuantum cognitionQuantum cognition is an emerging field which applies the formalism of quantum theory to model cognitive phenomena such as human memory, concepts and conceptual reasoning, human judgment, and decision making...

, using quantum probability theory to model human behavior