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:
“But what now grips his fancy is her face,
And how the cunning picture holds her still
At just that smiling instant when her soul,
Grown sweetly faint, and swept beyond control,
Consents to his inexorable will.”
—Richard Wilbur (b. 1921)