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Additional recommended knowledge
Note the (-1)F operator. This is what makes it different from the ordinary partition function.
In a supersymmetric theory, each nonzero energy eigenvalue contains an equal number of bosonic and fermionic states. Because of this, the Witten index is independent of the temperature and gives the number of bosonic vacuum states minus the number of fermionic vacuum states.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Witten_index". A list of authors is available in Wikipedia.|