String (physics)

Unlike elementary particles, which are zero-dimensional or point-like by definition, strings are one-dimensional extended entities.

Strings are also sometimes studied in nuclear physics where they are used to model flux tubes.

The physics of a string is described by means of a two-dimensional conformal field theory associated with the worldsheet.

An open string, on the other hand, has two end-points and is topologically equivalent to a line interval.

Other vibrational modes of open strings exhibit the properties of photons and gluons.