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Fluid membranes made out of lipid bilayers are the fundamental separation structure in eukaryotic cells. Many physiological processes rely on dramatic shape and topological changes (e.g. fusion, fission) of fluid membrane systems. Fluidity…

数值分析 · 数学 2010-07-29 Marino Arroyo , Antonio DeSimone , Luca Heltai

We investigate hydrodynamic fluctuations in a 2D granular fluid excited by a vibrating base and in the presence of gravity, focusing on the transverse velocity modes. Since the system is inhomogeneous, we measure fluctuations in horizontal…

软凝聚态物质 · 物理学 2015-05-28 Giulio Costantini , Andrea Puglisi

The use of excessively long timesteps in dissipative particle dynamics simulations may produce simulation artifacts due to the generation of configurations which are not representative of the desired canonical ensemble. The configurational…

统计力学 · 物理学 2007-05-23 Michael P. Allen

We describe a numerical method for simulating stochastic fluid dynamics near a critical point in the Ising universality class. This theory is known as model H, and is expected to govern the non-equilibrium dynamics of Quantum Chromodynamics…

核理论 · 物理学 2025-03-31 Chandrodoy Chattopadhyay , Josh Ott , Thomas Schaefer , Vladimir V. Skokov

A pure fluid at its critical point shows a dramatic slow-down in its dynamics, due to a divergence of the order-parameter susceptibility and the coefficient of heat transport. Under isothermal conditions, however, sound waves provide the…

统计力学 · 物理学 2015-03-20 Markus Gross , Fathollah Varnik

We study the effects of chiral constituent molecules on the macroscopic shapes attained by lipid bilayer membranes. Such fluid membranes are beautiful examples of statistical ensembles of random shapes, sometimes coupled to in-plane order.…

凝聚态物理 · 物理学 2008-02-03 P. Nelson , T. Powers

We study purely dissipative relaxational dynamics in the three-dimensional Ising universality class. To this end, we simulate the improved Blume-Capel model on the simple cubic lattice by using local algorithms. We perform a finite size…

统计力学 · 物理学 2020-02-28 Martin Hasenbusch

The interaction potential between supported floating bilayers has been determined by grazing incidence specular and off-specular scattering using synchrotron radiation. Our measurements demonstrate that floating bilayers are significantly…

软凝聚态物质 · 物理学 2012-05-21 L. Malaquin , T. Charitat , J. Daillant , S. Lecuyer , G. Fragneto

Chiral active fluids show the emergence of a turbulent behavior characterized by multiple dynamic vortices whose maximum size is specific for each experimental system. This is in contrast to hydrodynamic simulations in which the size of…

软凝聚态物质 · 物理学 2024-08-26 Joscha Mecke , Yongxiang Gao , Gerhard Gompper , Marisol Ripoll

In complex systems, external parameters often determine the phase in which the system operates, i.e., its macroscopic behavior. For nearly a century, statistical physics has extensively studied systems' transitions across phases,…

The dynamic critical exponent $z$ is determined numerically for the $d$-dimensional XY model ($d=2, 3$, and 4) subject to relaxational dynamics and resistively shunted junction dynamics. We investigate both the equilibrium fluctuation and…

超导电性 · 物理学 2007-05-23 Lars Melwyn Jensen , Beom Jun Kim , Petter Minnhagen

Physical kinetic roughening processes are well known to exhibit universal scaling of observables that fluctuate in space and time. Are there analogous dynamic scaling laws that are unique to the chemical reaction mechanisms available…

统计力学 · 物理学 2022-11-17 Shrabani Mondal , Jonah S. Greenberg , Jason R. Green

Out of equilibrium quantum systems, on top of quantum fluctuations, display complex temporal patterns. Such time fluctuations are generically exponentially small in the system volume and can be therefore safely ignored in most of the cases.…

量子物理 · 物理学 2014-02-12 Lorenzo Campos Venuti , Paolo Zanardi

The equilibrium distance between two lipid bilayers stable in bulk water and in proximity of a substrate was investigated. Samples consisted of a homogeneous lipid bilayer, floating near an identical bilayer deposited on the hydrophilic…

软凝聚态物质 · 物理学 2007-05-23 Giovanna Fragneto , Thierry Charitat , Edith Bellet-Amalric , Robert Cubitt , Francois Graner

We report that the local Debye-Waller factor in a simulated 2D glass-forming mixture exhibits significant spatial heterogeneities and that these short time fluctuations provide an excellent predictor of the spatial distribution of the long…

统计力学 · 物理学 2009-01-23 Asaph Widmer-Cooper , Peter Harrowell

Universal scaling near phase transitions is one of the central ideas of physics, linking the growth of spatial correlations to the slowing down of dynamics. So far, direct experimental access to this critical behavior has remained largely…

In this paper we present the results of a large-scale numerical investigation of structural properties of a model of cell membrane, simulated as a bilayer of flexible molecules in vacuum. The study was performed by carrying out extensive…

生物物理 · 物理学 2009-11-07 G. La Penna , S. Letardi , V. Minicozzi , S. Morante , G. C. Rossi , G. Salina

The dynamics of a bilayer system of ultracold dipolar molecules exhibits classical and quantum glassy behavior, characterized by long tails in the relaxation time and dynamical heterogeneity. In the proposed setup, quantum fluctuations are…

量子气体 · 物理学 2013-12-09 Wolfgang Lechner , Peter Zoller

The crystallographic restriction theorem constrains two-dimensional nematicity to display either Ising ($Z_{2}$) or three-state-Potts ($Z_{3}$) critical behaviors, both of which are dominated by amplitude fluctuations. Here, we use group…

强关联电子 · 物理学 2025-09-15 Virginia Gali , Matthias Hecker , Rafael M. Fernandes

We study the stress distribution profiles and the height and thickness fluctuations of lipid membranes in the tilted gel state by Monte Carlo simulations of a generic coarse-grained model for lipid membranes, which reproduces many known…

软凝聚态物质 · 物理学 2010-02-24 Beate West , Friederike Schmid