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Alternatives to the stochastic "noise vector" approach · Around

2017

Alternatives to the stochastic "noise vector" approach

de Forcrand, Philippe, Jaeger, Benjamin

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Several important observables, like the quark condensate and the Taylor coefficients of the expansion of the QCD pressure with respect to the chemical potential, are based on the trace of the inverse Dirac operator and of its powers.

Such traces are traditionally estimated with "noise vectors" sandwiching the operator.
We explore alternative approaches based on polynomial approximations of the inverse Dirac operator.

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P. Hasenfratz, F. Karsch, Physics Letters B 125
1983
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L. Giusti, M. Lüscher, JHEP 03
2009
Earlier work this paper cites.
P. de Forcrand, PoS LAT2009
2009
Earlier work this paper cites.

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