In superstring theory, each state may be represented in many ways, depending on how the ground state is defined. Each representation is called a picture, and is denoted by a number, such as 0 picture or −1 picture.
The difference between the ground states is according to the action of the superghosts oscillators on them, and the number of the picture (plus 1/2) reflects the highest superghost oscillator which does not annihilate the ground state.
Famous quotes containing the word picture:
“no picture is made to endure nor to live with
but it is made to sell and sell quickly
with usura, sin against nature,
is thy bread ever more of stale rags
is thy bread dry as paper,”
—Ezra Pound (1885–1972)