Spectral Functions, Maximum Entropy Method and Unconventional Methods in Lattice Field Theory

Details Spectral Functions, Maximum Entropy Method and Unconventional Methods in Lattice Field Theory Spectral Functions, Maximum Entropy Method and Unconventional Methods in Lattice Field Theory

2002-02-25

arxiv.org/abs/hep-lat/0202024v2

Nucl.Phys.Proc.Suppl. 109A (2002) 192-196

Physics

High Energy Physics

High Energy Physics - Lattice

Paper presented at the Workshop on Lattice Hadron Physics, July 2001, Cairns, Australia. 5 pages. Minor spelling error correct

Scientific paper

10.1016/S0920-5632(02)01414-7

We present two unconventional methods of extracting information from hadronic 2-point functions produced by Monte Carlo simulations. The first is an extension of earlier work by Leinweber which combines a QCD Sum Rule approach with lattice data. The second uses the Maximum Entropy Method to invert the 2-point data to obtain estimates of the spectral function. The first approach is applied to QCD data, and the second method is applied to the Nambu--Jona-Lasinio model in (2+1)D. Both methods promise to augment the current approach where physical quantities are extracted by fitting to pure exponentials.

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