Closed string
= Closed string
{wiki}
A closed string has a cylindrical worldsheet without boundary. Periodicity permits independent left- and right-moving oscillator sectors and, in a compact target direction, winding modes.
= Closed string
{wiki}
A closed string has a cylindrical worldsheet without boundary. Periodicity permits independent left- and right-moving oscillator sectors and, in a compact target direction, winding modes.