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Journal of Physical Studies

Renormalization group and sextic effective interaction for the two-dimensional Ising model

Aleksandr Ivanovich Sokolov, E. V. Orlov

Published Jan 1, 1999• 0 citations
Publisher

Abstract

The universal critical value g 6 of the renormalized sextic coupling constant entering the equation of state of the two{dimensional Ising model is estimated within the renormalization{group approach.Four{loop RG expansion for g6 is calculated and resummed by means of the Pad e{Borel{Leroy technique.The estimated g 6 = 1:10 is obtained which agree quite well with that deduced recently by Zinn, Lai, and Fisher from the high{temperature expansions.

DOI
10.30970/jps.03.280

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The universal critical value g 6 of the renormalized sextic coupling constant entering the equation of state of the two{dimensional Ising model is estimated within the renormalization{group approach.Four{loop RG expansion for g6 is calculated and resummed by means of the Pad e{Borel{Leroy technique.The estimated g 6 = 1:10 is obtained which agree quite well with that deduced recently by Zinn, Lai, and Fisher from the high{temperature expansions.
The field-theoretical renormalization-group approach is used to estimate the universal critical value g6∗{g}_{6}^{*}g6∗​ of the renormalized sextic coupling constant for the two-dimensional Ising model. A four-loop perturbative expansion for g6{g}_{6}g6​ is calculated and resummed by means of the Pad\'e-Borel-Leroy technique. Under the optimal value of the shift parameter b,b,b, providing the fastest convergence of the iteration procedure, the estimates g6∗=1.10,{g}_{6}^{*}=1.10,g6∗​=1.10, g6∗/g4∗2=2.94{g}_{6}^{*}{/g}_{4}^{*2}=2.94g6∗​/g4∗2​=2.94 are obtained, which agree quite well with those deduced recently by Zinn, Lai, and Fisher [Phys. Rev. E 54, 1176 (1996)] from the high-temperature expansions.
Higher{order vertices at zero external momenta for the scalar eld theory, describing the critical behaviour of the Ising model, are studied within the eld{theoretical renormalization group (RG) approach in three dimensions.Dimensionless six{point g6 and eight{point g8 eective coupling constants are calculated in the three{loop approximation.Their numerical values, universal at criticality, are estimated by means of the Pad e and Pad e{Borel summation of the RG expansions found and by putting the renormalized quartic coupling constant equal to its universal xed{point value known from six{loop RG calculations.The values of g 6 obtained are compared with their analogs resulting from the {expansion, Monte Carlo simulations, the Wegner{Houghton equations and the linked cluster expansion series.The eld{theoretical estimates for g 6 are shown to be in a good agreement with each other, diering considerably from the values given by other methods.
The pseudo-ε-expansions for the coordinate of the fixed point g * , the critical exponents, and the sextic effective coupling constant g 6 are determined for the two-dimensional Ising model on the basis of the five-loop renormalization group series. It is found that the pseudoe-expansions for the coordinate of the fixed point g * , the inverse exponent γ −1 , and the constant g 6 possess a remarkable property, namely, the higher terms of these series are so small that reliable numerical results can be obtained without invoking Borel summation.
We compute the 2n-point renormalized coupling constants in the symmetric phase of the three-dimensional (3D) Ising model on the simple cubic lattice in terms of the high temperature expansions O(${\mathrm{\ensuremath{\mathrm{B}}}}^{17}$) of the Fourier transformed 2n-point connected correlation functions at zero momentum. Our high temperature estimates of these quantities, which enter into the small field expansion of the effective potential for a 3D scalar field at the infrared fixed point or, equivalently, in the critical equation of state of the 3D Ising model universality class, are compared with recent results obtained by renormalization group methods, strong coupling, stochastic simulations, as well as previous high temperature expansions.
We compute the 2 n -point coupling constants in the high-temperature phase of the two-dimensional Ising model by using transfer-matrix techniques. This provides the first few terms of the expansion of the effective potential (Helmholtz free energy) and of the equation of state in terms of the renormalized magnetization. By means of a suitable parametric representation, we determine an analytic extension of these expansions, providing the equation of state in the whole critical region in the t , h plane.