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On the formal equivalence of the TAP and thermodynamic methods in the SK model

Andrea Cavagna1, Irene Giardina1, Giorgio Parisi1 and Marc Mézard2

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We revisit two classic Thouless–Anderson–Palmer (TAP) studies of the Sherrington–Kirkpatrick model (Bray A J and Moore M A 1980 J. Phys. C: Solid State Phys. 13 L469; De Dominicis C and Young A P 1983 J. Phys. A: Math. Gen. 16 2063). By using the Becchi–Rouet–Stora–Tyutin (BRST) supersymmetry, we prove the general equivalence of TAP and replica partition functions, and show that the annealed calculation of the TAP complexity is formally identical to the quenched thermodynamic calculation of the free energy at one step level of replica symmetry breaking. The complexity we obtain by means of the BRST symmetry turns out to be considerably smaller than the previous non-symmetric value.


PACS

75.10.Nr Spin-glass and other random models

05.70.Ce Thermodynamic functions and equations of state

MSC

82D30 Random media, disordered materials (including liquid crystals and spin glasses)

Subjects

Condensed matter: electrical, magnetic and optical

Statistical physics and nonlinear systems

Dates

Issue 5 (7 February 2003)

Received 5 November 2002

Published 22 January 2003



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