We provide an exact expression of the moment of the partition function for random energy models of finite system size, generalizing an earlier expression for a grand canonical version of the discrete random energy model presented by the authors in Prog. Theor. Phys. 111, 661 (2004). The expression can be handled both analytically and numerically, which is useful for examining how the analyticity of the moment with respect to the replica numbers, which play the role of powers of the moment, can be broken in the thermodynamic limit. A comparison with a replica method analysis indicates that the analyticity breaking can be regarded as the origin of the one-step replica symmetry breaking. The validity of the expression is also confirmed by numerical methods for finite systems.
We study the expectation value of the logarithm of the partition function of large binary-to-binary lattice-gas Restricted Boltzmann Machines (RBMs) within a replica-symmetric ansatz, averaging over the disorder represented by the parameters of the RBM Hamiltonian. Averaging over the Hamiltonian parameters is done with a diagonal covariance matrix. Due to the diagonal form of the parameter covariance matrix not being preserved under the isomorphism between the Ising and lattice-gas forms of the RBM, we find differences in the behaviour of the quenched log partition function of the lattice-gas …
Exact Analytic Continuation with Respect to the Replica Number in the Discrete Random Energy Model of Finite System Size
对于一个简单的自旋玻璃模型{ \em离散随机能量模型}(DREM),得到了适用于任何有限系统尺寸$N$和复功率$n (\Re(n)>0)$的配分函数矩的表达式.利用该表达式研究了热力学极限$N \to \infty$下的矩行为,发现当温度足够低时,在一定的实副本数下发生相变,直接阐明了DREM在副本数空间{ \em without using the replica trick}中复本对称性破缺的情形.数值上证实了该表达式的有效性。
Toda lattice representation for random matrix model with logarithmic confinement
我们为具有对数约束的随机矩阵模型构建了副本场论[K. A. Muttalib等人,物理修订信函71,471(1993)]。对于任意大小的矩阵$N$,精确计算相应的副本配分函数。我们对原模型进行了色味变换,并找到了两种配方中副本配分函数对应的Toda晶格方程。利用伪酉超群$M\to\infty$(Stiefel流形)的齐次因子空间上的广义Itzikson-Zuber(IZ)积分定义了味空间中的副本配分函数,并给出了它的紧形式.
Exact replica treatment of non-Hermitean complex random matrices
最近发现的零维复制场论的精确可积性[E. Kanzieper,Phys. Rev. Lett. 89,250201(2002)]的背景下检查的非厄米特随机矩阵(Ginibre酉包围)。特别是,这种随机矩阵模型的各种非微扰费米子副本配分函数被证明属于一个积极的,半无限户田晶格层次,其Painleve减少后,产生精确的表达式的平均水平密度和密度-密度关联函数在这两个大部分的复杂的频谱和其边缘附近。比较了基于“复本对称性破缺“近似处理非厄米无序哈密顿量。我们的副本的方法和利用无限(超对称)Toda格方程的副本限制的框架之间的差异进行了讨论。
Cusps and shocks in the renormalized potential of glassy random manifolds: How Functional Renormalization Group and Replica Symmetry Breaking fit together
We propose the use of the Distributional Zeta-Function (DZF) for constructing a new set of Systemic Performance Measures (SPM). SPM have been proposed to investigate network synthesis problems such as the growing of linear consensus networks. The adoption of the DZF has shown interesting physical consequences that in the usual replica method are still unclarified, i.e., the connection between the spontaneous symmetry breaking mechanism and the structure of the replica space in the disordered model. We relate topology of the network and the partition function present in the DZF by using the spe…
We analyze a two-body nonhermitian two-site Sachdev-Ye-Kitaev model with the couplings of one site complex conjugated to the other site. This model, with no explicit coupling between the sites, shows an infinite number of phase transitions which is a consequence of the partition function factorizing into a product over Matsubara frequencies. We calculate the quenched free energy in two different ways, first in terms of the single-particle energies, and second by solving the Schwinger-Dyson equations. The first calculation can be done entirely in terms of a one-site model. The conjugate replica…