Marginally stable equilibria in critical ecosystems

G Biroli, G Bunin, C Cammarota - New Journal of Physics, 2018 - iopscience.iop.org
In this work we study the stability of the equilibria reached by ecosystems formed by a large
number of species. The model we focus on are Lotka–Volterra equations with symmetric …

Optimal sequence memory in driven random networks

J Schuecker, S Goedeke, M Helias - Physical Review X, 2018 - APS
Autonomous, randomly coupled, neural networks display a transition to chaos at a critical
coupling strength. Here, we investigate the effect of a time-varying input on the onset of …

Organic ferromagnetism: trapping spins in the glassy state of an organic network structure

J Mahmood, J Park, D Shin, HJ Choi, JM Seo, JW Yoo… - Chem, 2018 - cell.com
The unique organic π-conjugated network structure was synthesized in
trifluoromethanesulfonic acid at 155° C by self-polymerization of the …

Ab initio calculation of structural, electronic and magnetic properties and hyperfine parameters at the Fe sites of pristine ZnFe2O4

JJM Quintero, CER Torres, LA Errico - Journal of Alloys and Compounds, 2018 - Elsevier
In this work we present an ab initio study of structural, electronic, magnetic and hyperfine
properties of pristine Zn-ferrite (ZnFe 2 O 4, ZFO). Density Functional Theory calculations …

Disorder-free spin glass transitions and jamming in exactly solvable mean-field models

H Yoshino - SciPost Physics, 2018 - scipost.org
We construct and analyze a family of $ M $-component vectorial spin systems which exhibit
glass transitions and jamming within supercooled paramagnetic states without quenched …

Comparison of Gabay–Toulouse and de Almeida–Thouless instabilities for the spin-glass XY model in a field on sparse random graphs

C Lupo, F Ricci-Tersenghi - Physical Review B, 2018 - APS
Vector spin glasses are known to show two different kinds of phase transitions in the
presence of an external field: the so-called de Almeida–Thouless and Gabay–Toulouse …

Expansion of the effective action around non-Gaussian theories

T Kühn, M Helias - Journal of Physics A: Mathematical and …, 2018 - iopscience.iop.org
This paper derives the Feynman rules for the diagrammatic perturbation expansion of the
effective action around an arbitrary solvable problem. The perturbation expansion around a …

Mean field asymptotics in high-dimensional statistics: From exact results to efficient algorithms

A Montanari - Proceedings of the International Congress of …, 2018 - World Scientific
Modern data analysis challenges require building complex statistical models with massive
numbers of parameters. It is nowadays commonplace to learn models with millions of …

The full replica symmetry breaking in the ising spin glass on random regular graph

F Concetti - Journal of Statistical Physics, 2018 - Springer
In this paper, we extend the full replica symmetry breaking scheme to the Ising spin glass on
a random regular graph. We propose a new martingale approach, that overcomes the limits …

Validation of the replica trick for simple models

T Shinzato - Journal of Statistical Mechanics: Theory and …, 2018 - iopscience.iop.org
We discuss the replica analytic continuation using several simple models in order to prove
mathematically the validity of the replica analysis, which is used in a wide range of fields …