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Physicists distinguish between three types of fields, in increasing generality:

• scalar fields, such as temperature,
• vector fields, such as the magnitude and direction of the force at each point in a magnetic field.
• tensor fields, such as the stress-energy tensor in general relativity.

Classically, field theory was first used to describe the behavior of particles in electric and magnetic fields. These were later unified into a single electromagnetic field.

The quantum mechanical analogue of field theory is called quantum field theory. Examples of quantum field theories include:

• quantum electrodynamics
• quantum chromodynamics
• electroweak forceIn physics, the electroweak theory presents a unified description of two of the four fundamental forces of nature: electromagnetism and the weak nuclear force. Although these two forces appear very different at everyday low energies, the theory models the

See also

Physics: Coherent stateIn quantum mechanics a coherent state is a quantum state which describes coherent fields, fields where all of the particles involved share some measurable property that allows them to be thought of as being "in phase", or in other circumstances, one large, Gauge theoryGauge theories are a class of physical theories based on the idea that symmetry transformations can be performed locally as well as globally. Most physical theories are described by Lagrangians which are invariant under certain transformations, when the t

List of electronics topicsThis is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics, reliablity, and semiconductors. Please remove any redirects (and do not add any redirects). 0-9 16VSB 2VSB 32VSB 4000 series 4VSB 555 tim: Closed waveguideIn telecommunication, a closed waveguide is an electromagnetic waveguide (a) that is tubular, usually with a circular or rectangular cross section, (b) that has electrically conducting walls, (c) that may be hollow or filled with a dielectric material, (d,