Solvable quantum Grassmann matrices

We explore systems with a large number of fermionic degrees of freedom subject to non-local interactions. We study both vector and matrix-like models with quartic interactions. The exact thermal partition function is expressed in terms of an ordinary bosonic integral, which has an eigenvalue repulsi...

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Bibliographic Details
Published inJournal of statistical mechanics Vol. 2017; no. 4; pp. 43102 - 43122
Main Authors Anninos, D, Silva, G A
Format Journal Article
LanguageEnglish
Published IOP Publishing and SISSA 03.04.2017
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Summary:We explore systems with a large number of fermionic degrees of freedom subject to non-local interactions. We study both vector and matrix-like models with quartic interactions. The exact thermal partition function is expressed in terms of an ordinary bosonic integral, which has an eigenvalue repulsion term in the matrix case. We calculate real time correlations at finite temperature and analyze the thermal phase structure. When possible, calculations are performed in both the original Hilbert space as well as the bosonic picture, and the exact map between the two is explained. At large N, there is a phase transition to a highly entropic high temperature phase from a low temperature low entropy phase. Thermal two-point functions decay in time in the high temperature phase.
Bibliography:JSTAT_012P_0117
ISSN:1742-5468
1742-5468
DOI:10.1088/1742-5468/aa668f