Britcom about a group of six friends - three men and three women - and the ups and downs they encounter playing the 21st century dating game.

Type: Scripted

Languages: English

Status: Ended

Runtime: 30 minutes

Premier: 2000-05-12

## Coupling - Coupling constant - Netflix

In physics, a coupling constant or gauge coupling parameter is a number that determines the strength of the force exerted in an interaction. Usually, the Lagrangian or the Hamiltonian of a system describing an interaction can be separated into a kinetic part and an interaction part. The coupling constant determines the strength of the interaction part with respect to the kinetic part, or between two sectors of the interaction part. For example, the electric charge of a particle is a coupling constant that characterizes an interaction with two charge-carrying fields and one photon field (hence the common Feynman diagram with two arrows and one wavy line). Since photons carry electromagnetism, this coupling constant determines how strongly electrons feel such a force and has its value fixed by experiment. A coupling constant plays an important role in dynamics. For example, one often sets up hierarchies of approximation based on the importance of various coupling constants. In the motion of a large lump of magnetized iron, the magnetic forces may be more important than the gravitational forces because of the relative magnitudes of the coupling constants. However, in classical mechanics one usually makes these decisions directly by comparing forces.

## Coupling - Beta functions - Netflix

β ( g ) = μ ∂ g ∂ μ = ∂ g ∂ ln μ , {\displaystyle \beta (g)=\mu {\frac {\partial g}{\partial \mu }}={\frac {\partial g}{\partial \ln \mu }},}

In quantum field theory, a beta function β(g) encodes the running of a coupling parameter, g. It is defined by the relation