Log-correlated random-energy models with extensive free-energy fluctuations: Pathologies caused by rare events as signatures of phase transitions.
Log-correlated random-energy models with extensive free-energy fluctuations: Pathologies caused by rare events as signatures of phase transitions.
复制标题
具有广泛自由能波动的对数相关随机能量模型:由罕见事件引起的病理学作为相变的特征。
DOI:
10.1103/physreve.97.022117
复制
发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Cao X
中科院分区:
文献类型:
--
作者:
Cao X
We address systematically an apparent nonphysical behavior of the free-energy moment generating function for several instances of the logarithmically correlated models: the fractional Brownian motion with Hurst index(fBm0) (and itsbridgeversion), a one-dimensional model appearing in decaying Burgers turbulence with log-correlated initial conditions and, finally, the two-dimensional log-correlated random-energy model (logREM) introduced in Caoet al.[Phys. Rev. Lett. 118, 090601 (2017)PRLTAO0031-900710.1103/PhysRevLett.118.090601] based on the two-dimensional Gaussian free field with background charges and directly related to the Liouville field theory. All these models share anomalously large fluctuations of the associated free energy, with a variance proportional to the log of the system size. We argue that a seemingly nonphysical vanishing of the moment generating function for some values of parameters is related to the termination point transition (i.e., prefreezing). We study the associated universal log corrections in the frozen phase, both for logREMs and for the standard REM, filling a gap in the literature. For the above mentioned integrable instances of logREMs, we predict the nontrivial free-energy cumulants describing non-Gaussian fluctuations on the top of the Gaussian with extensive variance. Some of the predictions are tested numerically.
登录
查看更多内容
DOI:
10.1209/0295-5075/90/60004
发表时间:
2010
期刊:
EPL (Europhysics Letters)
影响因子:
--
作者:
Y. Fyodorov;P. Doussal;Alberto Rosso
通讯作者:
Alberto Rosso
DOI:
10.1209/0295-5075/114/40003
发表时间:
2016
期刊:
Europhysics Letters
影响因子:
--
作者:
Xiangyu Cao;P. Le Doussal
通讯作者:
P. Le Doussal
影响因子:
8.6
作者:
Kogan;Mudry;Tsvelik
通讯作者:
Tsvelik
影响因子:
1.6
作者:
Fyodorov Y
通讯作者:
Fyodorov Y
DOI:
10.1088/1751-8113/49/2/02lt02
发表时间:
2015
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
作者:
X. Cao;A. Rosso;R. Santachiara
通讯作者:
R. Santachiara