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REWEIGHTING IN MONTE-CARLO AND MONTE-CARLO RENORMALIZATION-GROUP STUDIES
Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Fysik. Linköpings universitet, Tekniska högskolan.
Supercomputer Computations Research Institute, Florida State University, Florida, USA .
1991 (Engelska)Ingår i: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 43, nr 7, B, s. 5773-5783Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A method of reweighting Monte Carlo data to parameters other than the simulated ones is investigated. The method is also extended to include Monte Carlo renormalization-group simulations. Both single and multiple simulation reweighting is used. The models studied are the d = 2 ferromagnetic q = 3 Potts model and the d = 2 antiferromagnetic Ising model. It is shown that the reweighting produces a systematic shift in the height and location of the specific-heat peak. This shift, which without proper care may lead to erroneous results, depends on the simulated and reweighted temperatures and on the number of configurations included in the reweighting. Only for very large numbers of configurations does the shift decrease as the inverse square root of the number of configurations. Within the Monte Carlo renormalization-group study, it is shown that the critical exponents for the Ising model are determined more accurately from a multiple reweighting using one simulation below the critical temperature and one above than from the individual simulations. It is shown that it is more efficient to use two simulations at a time than all of them at once when reweighting multiple simulations.

Ort, förlag, år, upplaga, sidor
1991. Vol. 43, nr 7, B, s. 5773-5783
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Naturvetenskap
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URN: urn:nbn:se:liu:diva-105985DOI: 10.1103/PhysRevB.43.5773OAI: oai:DiVA.org:liu-105985DiVA, id: diva2:712611
Tillgänglig från: 2014-04-15 Skapad: 2014-04-15 Senast uppdaterad: 2017-12-05

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