A scalar field is just a field that has a value — or amount — assigned to it and nothing else. If you want to know anything else, even as simple as which way something points, a scalar simply ...

Scalar Field: A field described by a single numerical value at every point in space and time, used to model a variety of physical phenomena from particle interactions to cosmological dynamics.

The work of US physicists Robert Dicke and Carl Brans, this theory proposed that alongside spacetime and its contents, the universe has a third component, the “scalar field”.