 
Summary: Random matrix theory as playground
for the sign problem
Jacques Bloch
Institute for Theoretical Physics, University of Regensburg
Sign Problems and Complex Actions
workshop at ECT* Trento
26 March 2009
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Outline
1 Lattice QCD and chiral random matrix theory with chemical potential
2 Phase of fermion determinant in chRMT
3 Quenched and unquenched chRMT simulations
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Chiral symmetry and quark chemical potential
QCD at nonzero quark density introduce quark chemical potential µ
Continuum fermion action at with chemical potential
SF = d4
x ¯(x)(m + µ µ
cov
+ µ4)(x)
