What is a gauge in gauge theory?

A gauge theory is a type of theory in physics. The word gauge means a measurement, a thickness, an in-between distance (as in railroad tracks), or a resulting number of units per certain parameter (a number of loops in an inch of fabric or a number of lead balls in a pound of ammunition).

What is gauge quantum field theory?

A gauge field theory is a special type of quantum field theory, in which matter fields (like electrons and quarks, which make up protons and neutrons) interact with each other via forces that are mediated by the exchange of vector bosons (like photons and gluons, which bind quarks together in nucleons).

Is higher or lower gauge better?

A wire with a smaller gauge (larger diameter) can carry more power than one with a larger gauge. In general, a lower AWG number is better than higher AWG. Therefore, it is important that the current carrying capacity of a wire or circuit be considered. Larger wire uses more metal and is, therefore, more expensive.

Is there a difference between gauge and Gage?

The verb gauge, which refers to measuring or estimating, also has a variant gage. This variant appears to show up primarily in informal sources, though not often. Gauge is by far the preferred spelling in general usage for both the noun and the verb; we encourage you use it.

What is Coulomb gauge in electrodynamics?

The Coulomb gauge is a minimal gauge in the sense that the integral of A2 over all space is minimal for this gauge: All other gauges give a larger integral. The minimum value given by the Coulomb gauge is . In regions far from electric charge the scalar potential becomes zero. This is known as the radiation gauge.

What is gauge invariant?

The term gauge invariance refers to the property that a whole class of scalar and vector potentials, related by so-called gauge transformations, describe the same electric and magnetic fields.

What is difference between electromagnetic theory and electrodynamics?

Electrodynamics is the study of phenomena associated with charged bodies in motion and varying electric and magnetic fields; since a moving charge produces a magnetic field, electrodynamics is concerned with effects such as magnetism, electromagnetic radiation, and electromagnetic induction, including such practical …