Granger causality has long been a prominent method for inferring causal interactions between stochastic variables for a broad range of complex physical systems. However, it has been recognized that a moving average (MA) component in the data presents a serious confound to Granger causal analysis, as...

[Phys. Rev. E 91, 040101] Published Thu Apr 23, 2015

]]>We generalize Morita's works [J. Phys. A 7, 289 (1974)JPMNAX10.1088/0305-4470/7/2/014; J. Phys. A 7, 1613 (1974)JPMNAX10.1088/0305-4470/7/13/015] on ground states of Ising chains, for chains with a periodic structure and different spins, to any interaction order. The main assumption is translational...

[Phys. Rev. E 91, 042128] Published Thu Apr 23, 2015

]]>In this work we analyze the simultaneous emergence of diffusive energy transport and local thermalization in a nonequilibrium one-dimensional quantum system, as a result of integrability breaking. Specifically, we discuss the local properties of the steady state induced by thermal boundary driving i...

[Phys. Rev. E 91, 042129] Published Thu Apr 23, 2015

]]>In the usual Achlioptas processes the smallest clusters of a few randomly chosen ones are selected to merge together at each step. The resulting aggregation process leads to the delayed birth of a giant cluster and the so-called explosive percolation transition showing a set of anomalous features. W...

[Phys. Rev. E 91, 042130] Published Thu Apr 23, 2015

]]> We study the one-dimensional branching Brownian motion starting at the origin and investigate the correlation between the rightmost (X_{max}≥0) and leftmost (X_{min}≤0) visited sites up to time t. At each time step the existing particles in the system either diffuse (with diffusion constant D), die (with ...

[Phys. Rev. E 91, 042131] Published Thu Apr 23, 2015

]]>We investigate the phase diagram of S=1 quantum spin systems with SU(2)-invariant interactions, at low temperatures and in three spatial dimensions. Symmetry breaking and the nature of extremal states can be studied using random loop representations. The latter confirm the occurrence of ferro- and a...

[Phys. Rev. E 91, 042132] Published Thu Apr 23, 2015

]]>Grains inside a vertically vibrated box undergo a transition from a density-inverted and horizontally homogeneous state, referred to as the granular Leidenfrost state, to a buoyancy-driven convective state. We perform a simulational study of the precursors of such a transition and quantify their dyn...

[Phys. Rev. E 91, 042202] Published Thu Apr 23, 2015

]]>We present experimental results on the propagation of an ultrasonic wave (40 kHz) in liquid foams, as a function of the foam physical and chemical parameters. We have first implemented an original setup, using transducers in a transmission configuration. The foam coarsening was used to vary the bubb...

[Phys. Rev. E 91, 042311] Published Thu Apr 23, 2015

]]>Fluids with competing short-range attractions and long-range repulsions mimic dispersions of charge-stabilized colloids that can display equilibrium structures with intermediate-range order (IRO), including particle clusters. Using simulations and analytical theory, we demonstrate how to detect clus...

[Phys. Rev. E 91, 042312] Published Thu Apr 23, 2015

]]>This paper introduces a unifying theory for describing complex behavior for porous materials. The key ingredients are the stored energy in solid-fluid interaction as well as the solid-solid and fluid-fluid interactions. A finite element formulation is employed which naturally accounts for the pore-p...

[Phys. Rev. E 91, 042406] Published Thu Apr 23, 2015

]]>The enhancement of tunneling probability in the nearly integrable system is closely examined, focusing on tunneling splittings plotted as a function of the inverse of the Planck's constant. On the basis of the analysis using the absorber which efficiently suppresses the coupling, creating spikes in ...

[Phys. Rev. E 91, 042913] Published Thu Apr 23, 2015

]]>We present a spatiotemporal analysis of a statistically stationary rotating-turbulence experiment, aiming to extract a signature of inertial waves and to determine the scales and frequencies at which they can be detected. The analysis uses two-point spatial correlations of the temporal Fourier trans...

[Phys. Rev. E 91, 043016] Published Thu Apr 23, 2015

]]>The lattice Boltzmann method (LBM) has been widely used to simulate microgaseous flows in recent years. However, it is still a challenging task for LBM to model that kind of microscale flow involving complex geometries, owing to the use of uniform Cartesian lattices in space. In this work, a boundar...

[Phys. Rev. E 91, 043305] Published Thu Apr 23, 2015

]]>For a globally coupled network of semiconductor lasers with delayed optical feedback, we demonstrate the existence of chimera states. The domains of coherence and incoherence that are typical for chimera states are found to exist for the amplitude, phase, and inversion of the coupled lasers. These c...

[Phys. Rev. E 91, 040901] Published Wed Apr 22, 2015

]]>Scale-free surfaces, such as cones, remain unchanged under a simultaneous expansion of all coordinates by the same factor. Probability density of a particle diffusing near such absorbing surface at large time approaches a simple form that incorporates power-law dependencies on time and distance from...

[Phys. Rev. E 91, 042126] Published Wed Apr 22, 2015

]]>An analysis of the efficiency and coefficient of performance (COP) for general heat engines and refrigerators with nonisothermal processes is conducted under the trade-off criterion. The specific heat of the working medium has significant impacts on the optimal configurations of heat devices. For cy...

[Phys. Rev. E 91, 042127] Published Wed Apr 22, 2015

]]> While monolayer area fraction versus time (A_{n}-t) curves obtained from surface pressure–area (π-A) isotherms for desorption-dominated (DD) processes in Langmuir monolayers of fatty acids represent continuous loss, those from Brewster angle microscopy (BAM) also show a two-dimensional (2D) coalescence...

[Phys. Rev. E 91, 042405] Published Wed Apr 22, 2015

]]>In the last few decades many investigations have been devoted to theoretical models in new areas concerning description of different biological, sociological, and historical processes. In the present paper we suggest a model of the Nazi Germany invasion of Poland, France, and the USSR based on kinet...

[Phys. Rev. E 91, 042806] Published Wed Apr 22, 2015

]]> In this paper we present a unified shell model for stably stratified and convective turbulence. Numerical simulation of this model for stably stratified flow shows Bolgiano-Obukhbov scaling in which the kinetic energy spectrum varies as k^{−11/5}. The shell model of convective turbulence yields Kolmogo...

[Phys. Rev. E 91, 043014] Published Wed Apr 22, 2015

]]>We investigate experimentally the sweeping of a nonwetting fluid by a wetting one in a quasi-two-dimensional porous medium consisting of random obstacles. We focus primarily on the resulting phase distributions and the residual nonwetting phase saturation as a function of the normalized wetting flui...

[Phys. Rev. E 91, 043015] Published Wed Apr 22, 2015

]]>In this paper we describe the physical processes that lead to the generation of giant electromagnetic pulses (GEMPs) at powerful laser facilities. Our study is based on experimental measurements of both the charging of a solid target irradiated by an ultra-short, ultra-intense laser and the detectio...

[Phys. Rev. E 91, 043106] Published Wed Apr 22, 2015

]]>A simple setup for the generation of ultra-intense quasistatic magnetic fields, based on the generation of electron currents with a predefined geometry in a curved snail (or ‘escargot’) target, is proposed and analyzed. Particle-in-cell simulations and qualitative estimates show that gigagauss scale...

[Phys. Rev. E 91, 043107] Published Wed Apr 22, 2015

]]> A generalization of the random geometric graph (RGG) model is proposed by considering a set of points uniformly and independently distributed on a rectangle of unit area instead of on a unit square [0,1]^{2}. The topological properties of the random rectangular graphs (RRGs) generated by this model are...

[Phys. Rev. E 91, 042805] Published Tue Apr 21, 2015

]]>The quantum ergodic conjecture equates the Wigner function for a typical eigenstate of a classically chaotic Hamiltonian with a δ function on the energy shell. This ensures the evaluation of classical ergodic expectations of simple observables, in agreement with Shnirelman's theorem, but this putati...

[Phys. Rev. E 91, 042911] Published Tue Apr 21, 2015

]]>We propose a variational superposed Gaussian approximation (VSGA) for dynamical solutions of Langevin equations subject to applied signals, determining time-dependent parameters of superposed Gaussian distributions by the variational principle. We apply the proposed VSGA to systems driven by a chaot...

[Phys. Rev. E 91, 042912] Published Tue Apr 21, 2015

]]>We investigate the evaporation of a droplet surrounded by superheated vapor with relative motion between phases. The evaporating droplet is a challenging process, as one must take into account the transport of mass, momentum, and heat. Here a lattice Boltzmann method is employed where phase change i...

[Phys. Rev. E 91, 043012] Published Tue Apr 21, 2015

]]> A model for the Reynolds-number dependence of the dimensionless dissipation rate C_{ɛ} was derived from the dimensionless Kármán-Howarth equation, resulting in C_{ɛ}=C_{ɛ,∞}+C/R_{L}+O(1/R_{L}^{2}), where R_{L} is the integral scale Reynolds number. The coefficients C and C_{ɛ,∞} arise from asymptotic expansions of the dime...

[Phys. Rev. E 91, 043013] Published Tue Apr 21, 2015

]]>Finite systems in confining potentials are known to undergo structural transitions similar to phase transitions. However, these systems are inhomogeneous, and their “melting” point may depend on the position in the trap and vary with the particle number. Focusing on three-dimensional Coulomb systems...

[Phys. Rev. E 91, 043104] Published Tue Apr 21, 2015

]]>We present an approach that can resolve the controversy with respect to the role of electron-electron collisions in calculating the dynamic conductivity of dense plasmas. In particular, the dc conductivity is analyzed in the low-density, nondegenerate limit where the Spitzer theory is valid and elec...

[Phys. Rev. E 91, 043105] Published Tue Apr 21, 2015

]]>Branching processes pervade many models in statistical physics. We investigate the survival probability of a Galton-Watson branching process after a finite number of generations. We derive analytically the existence of finite-size scaling for the survival probability as a function of the control par...

[Phys. Rev. E 91, 042122] Published Mon Apr 20, 2015

]]>We investigate quantum scaling phenomena driven by lower-dimensional defects in quantum Ising-like models. We consider quantum Ising rings in the presence of a bond defect. In the ordered phase, the system undergoes a quantum transition driven by the bond defect between a magnet phase, in which the ...

[Phys. Rev. E 91, 042123] Published Mon Apr 20, 2015

]]>The purpose of this paper is to implement a random death process into a persistent random walk model which produces sub-ballistic superdiffusion (Lévy walk). We develop a stochastic two-velocity jump model of cell motility for which the switching rate depends upon the time which the cell has spent m...

[Phys. Rev. E 91, 042124] Published Mon Apr 20, 2015

]]>We analytically investigate the heat current I and its thermal fluctuations Δ in a branching network without loops (Cayley tree). The network consists of two types of harmonic masses: vertex masses M placed at the branching points where phononic scattering occurs and masses m at the bonds between br...

[Phys. Rev. E 91, 042125] Published Mon Apr 20, 2015

]]>Random packing of surfaceless starlike particles built of 3 to 50 line segments was studied using random sequential adsorption algorithm. Numerical simulations allow us to determine saturated packing densities as well as the first two virial expansion coefficients for such objects. Measured kinetics...

[Phys. Rev. E 91, 042404] Published Mon Apr 20, 2015

]]>The generation of directed movement of cellular components frequently requires the rectification of Brownian motion. Molecular motor enzymes that use ATP to walk on filamentous tracks are typically involved in cell transport, however, a track-altering motor can arise when an enzyme interacts with an...

[Phys. Rev. E 91, 042711] Published Mon Apr 20, 2015

]]>We propose a variational approach to study renormalized phonons in momentum-conserving nonlinear lattices with either symmetric or asymmetric potentials. To investigate the influence of pressure for phonon properties, we derive an inequality which provides both the lower and upper bound of the Gibbs...

[Phys. Rev. E 91, 042910] Published Mon Apr 20, 2015

]]> The equation of state of partially ionized hydrogen plasma is considered with special focus on the contribution of the e-H_{2} interaction. Traditional semiempirical concepts such as the excluded volume are improved using microscopic approaches to treat the e-H_{2} problem. Within a cluster virial expansi...

[Phys. Rev. E 91, 043103] Published Mon Apr 20, 2015

]]>The nonbacktracking operator for a graph is the adjacency matrix defined on directed edges of the graph. The operator was recently shown to perform optimally in spectral clustering in sparse synthetic graphs and have a deep connection to belief propagation algorithm. In this paper we consider nonbac...

[Phys. Rev. E 91, 042120] Published Fri Apr 17, 2015

]]>The critical behavior of the Binder cumulant for Ising spin glasses in dimension four is studied through simulation measurements. Data for the bimodal interaction model are compared with those for the Laplacian interaction model. Special attention is paid to scaling corrections. The limiting infinit...

[Phys. Rev. E 91, 042121] Published Fri Apr 17, 2015

]]>We studied real-time motion of individual 20-nm silica nanoparticles in a thin layer of a nematic liquid crystal using a dark-field optical videomicroscopy. By tracking the positions of individual nanoparticles we observed that particle pair interactions are not only mediated by strong thermal fluct...

[Phys. Rev. E 91, 042505] Published Fri Apr 17, 2015

]]>We present an x-ray study of freely suspended hexatic films of the liquid crystal 3(10)OBC. Our results reveal spatial inhomogeneities of the bond-orientational (BO) order in the vicinity of the hexatic-smectic phase transition and the formation of large-scale hexatic domains at lower temperatures. ...

[Phys. Rev. E 91, 042506] Published Fri Apr 17, 2015

]]>A class of nonlocal nonlinear Schrödinger equations (NLSEs) is considered in an external potential with a space-time modulated coefficient of the nonlinear interaction term as well as confining and/or loss-gain terms. This is a generalization of a recently introduced integrable nonlocal NLSE with se...

[Phys. Rev. E 91, 042908] Published Fri Apr 17, 2015

]]>The reduction procedure for the general coupled nonlinear Schrödinger (GCNLS) equations with four-wave mixing terms is proposed. It is shown that the GCNLS system is equivalent to the well known integrable families of the Manakov and Makhankov U(n,m)-vector models. This equivalence allows us to cons...

[Phys. Rev. E 91, 042909] Published Fri Apr 17, 2015

]]>Recently, there has been much progress in creating microswimmers or microrobots capable of controlled propulsion in fluidic environments. These microswimmers have numerous possible applications in biomedicine, microfabrication, and sensing. One type of effective microrobot consists of rigid magnetic...

[Phys. Rev. E 91, 043011] Published Fri Apr 17, 2015

]]>We demonstrate that waves in distinct layers of a neuronal network can become phase locked by common spatiotemporal noise. This phenomenon is studied for stationary bumps, traveling waves, and breathers. A weak noise expansion is used to derive an effective equation for the position of the wave in e...

[Phys. Rev. E 91, 040701] Published Thu Apr 16, 2015

]]>We propose a self-consistent dynamo mechanism for the generation of large-scale magnetic fields in natural objects. Recent computational studies have described the formation of large-scale vortices in rotating turbulent convection. Here we demonstrate that for magnetic Reynolds numbers below the thr...

[Phys. Rev. E 91, 041001] Published Thu Apr 16, 2015

]]> We investigate the irreversible growth of (2+1)-dimensional magnetic thin films. The spin variable can adopt three states (s_{i}=±1,0), and the system is in contact with a thermal bath of temperature T. The deposition process depends on the change of the configuration energy, which, by analogy to the B...

[Phys. Rev. E 91, 042118] Published Thu Apr 16, 2015

]]>Active colloids exhibit persistent motion, which can lead to motility-induced phase separation (MIPS). However, there currently exists no microscopic theory to account for this phenomenon. We report a first-principles theory, free of fit parameters, for active spherical colloids, which shows explici...

[Phys. Rev. E 91, 042310] Published Thu Apr 16, 2015

]]>A wide spectrum of real-life systems ranging from neurons to botnets display spontaneous recovery ability. Using the generating function formalism applied to static uncorrelated random networks with arbitrary degree distributions, the microscopic mechanism underlying the depreciation-recovery proces...

[Phys. Rev. E 91, 042804] Published Thu Apr 16, 2015

]]>The spontaneous formation of heterogeneous patterns is a hallmark of many nonlinear systems, from biological tissue to evolutionary population dynamics. The standard model for pattern formation in general, and for Turing patterns in chemical reaction-diffusion systems in particular, are deterministi...

[Phys. Rev. E 91, 042907] Published Thu Apr 16, 2015

]]>We generalize a simple Monte Carlo (MC) model for dilute gases to consider the transport behavior of positrons and electrons in Percus-Yevick model liquids under highly nonequilibrium conditions, accounting rigorously for coherent scattering processes. The procedure extends an existing technique [Wo...

[Phys. Rev. E 91, 043304] Published Thu Apr 16, 2015

]]>The Goldstein-Kac telegraph process describes the one-dimensional motion of particles with constant speed undergoing random changes in direction. Despite its resemblance to numerous real-world phenomena, the singular nature of the resultant spatial distribution of each particle precludes the possibi...

[Phys. Rev. E 91, 042115] Published Wed Apr 15, 2015

]]>We address the problem of heat transport in a chain of coupled quantum harmonic oscillators, exposed to the influences of local environments of various nature, stressing the effects that the specific nature of the environment has on the phenomenology of the transport process. We study in detail the ...

[Phys. Rev. E 91, 042116] Published Wed Apr 15, 2015

]]>Idealized glass transitions are discussed within an alternative mode-coupling theory (TMCT) proposed by Tokuyama [Physica A 395, 31 (2014)PHYADX10.1016/j.physa.2013.10.028]. This is done in order to identify common ground with and differences from the conventional mode-coupling theory (MCT). It is p...

[Phys. Rev. E 91, 042117] Published Wed Apr 15, 2015

]]>We demonstrate the application of principal-component analysis (PCA) to the analysis of particle motion data in the form of a time series of images. PCA has the ability to resolve and isolate spatiotemporal patterns in the data. Using simulated data, we show that this translates into the ability to ...

[Phys. Rev. E 91, 042308] Published Wed Apr 15, 2015

]]> We report x-ray photon correlation spectroscopy experiments on the dynamics of the glass-former polypropylene glycol covering a temperature range from room temperature to the glass transition at T_{g}=205 K using silica tracer particles. Three temperature regimes are identified: At high temperatures, B...

[Phys. Rev. E 91, 042309] Published Wed Apr 15, 2015

]]>Linking our knowledge of organisms to our knowledge of ecological communities and ecosystems is a key challenge for ecology. Individual size distributions (ISDs) link the size of individual organisms to the structure of ecological communities, so that studying ISDs might provide insight into how org...

[Phys. Rev. E 91, 042708] Published Wed Apr 15, 2015

]]>We investigate the propensities for amino acids to form a specific secondary structure when they are paired with other amino acids. Our investigations use molecular dynamics (MD) computer simulations, and we compare the results to those from the Protein Data Bank (PDB). Proper comparison requires we...

[Phys. Rev. E 91, 042709] Published Wed Apr 15, 2015

]]>We present a Landau-type theory for the nonlinear elasticity of biopolymer gels with a part of the order parameter describing induced nematic order of fibers in the gel. We attribute the nonlinear elastic behavior of these materials to fiber alignment induced by strain. We suggest an application to ...

[Phys. Rev. E 91, 042710] Published Wed Apr 15, 2015

]]>A reduced description of exact coherent structures in the transition regime of plane parallel shear flows is developed, based on the Reynolds number scaling of streamwise-averaged (mean) and streamwise-varying (fluctuation) velocities observed in numerical simulations. The resulting system is charac...

[Phys. Rev. E 91, 043010] Published Wed Apr 15, 2015

]]>Here proper orthogonal decomposition (POD) modal decomposition are performed for flow past a circular cylinder at supercritical Reynolds numbers by projecting this onto instability modes. The important task of modeling a cylinder wake by Stuart-Landau (SL) and the Stuart-Landau-Eckhaus (SLE) equatio...

[Phys. Rev. E 91, 043303] Published Wed Apr 15, 2015

]]>Many small stochastic systems, such as nanodevices and molecular machines, are subject to feedback processes with a nonzero response time. The authors study the thermodynamics of such time-delayed feedback processes, and derive inequalities that provide bounds on the amount of work that can be extracted from the surrounding heat bath.

[Phys. Rev. E 91, 042114] Published Tue Apr 14, 2015

]]>We address the implications of finite ionic size and solvent polarization on the response of the electric double layer (EDL) at two cation-selective electrodes in nonequilibrium conditions. The current between the electrodes is driven by a steady-state dc bias in conjunction with a probing high-freq...

[Phys. Rev. E 91, 042307] Published Tue Apr 14, 2015

]]>Slowly compressed microcrystals deform via intermittent slip events, observed as displacement jumps or stress drops. Experiments often use one of two loading modes: an increasing applied stress (stress driven, soft), or a constant strain rate (strain driven, hard). In this work we experimentally tes...

[Phys. Rev. E 91, 042403] Published Tue Apr 14, 2015

]]>The dark conglomerate (DC) phase exhibited by a bent-core liquid crystal shows remarkable properties including an electric-field tunable chiral domain structure and a large (0.045) reduction of refractive index, while maintaining an optically dark texture when observed under crossed polarizers. A de...

[Phys. Rev. E 91, 042504] Published Tue Apr 14, 2015

]]>We study biological evolution on a random fitness landscape where correlations are introduced through a linear fitness gradient of strength c. When selection is strong and mutations rare the dynamics is a directed uphill walk that terminates at a local fitness maximum. We analytically calculate the ...

[Phys. Rev. E 91, 042707] Published Tue Apr 14, 2015

]]>We show that the log-periodic power law singularity model (LPPLS), a mathematical embodiment of positive feedbacks between agents and of their hierarchical dynamical organization, has a significant predictive power in financial markets. We find that LPPLS-based strategies significantly outperform th...

[Phys. Rev. E 91, 042803] Published Tue Apr 14, 2015

]]>The authors solve a long-standing problem in the stability of fluids that are subject to opposing gradients of temperature and solute concentration. Their analysis demonstrates that oscillation frequencies of traveling convection waves (but not those of standing waves) can be predicted from the mean fields.

[Phys. Rev. E 91, 043009] Published Tue Apr 14, 2015

]]>A measure of cluster size heterogeneity (H), introduced by Lee et al. [Phys. Rev. E 84, 020101 (2011)10.1103/PhysRevE.84.020101] in the context of explosive percolation, was recently applied to random percolation and to domains of parallel spins in the Ising and Potts models. It is defined as the av...

[Phys. Rev. E 91, 042113] Published Mon Apr 13, 2015

]]>Using a tilted two-layer colloidal system, the authors systematically study the effect of an external force on nonequilibrium steady-state distributions of colloidal particles diffusing over a periodic potential.

[Phys. Rev. E 91, 042306] Published Mon Apr 13, 2015

]]>The rhizosphere is the layer of soil around the roots where complex and dynamic interactions between plants and soil affect the capacity of plants to take up water. The physical properties of the rhizosphere are affected by mucilage, a gel exuded by roots. Mucilage can absorb large volumes of water,...

[Phys. Rev. E 91, 042706] Published Mon Apr 13, 2015

]]>Geometric confinement plays an important role in the dynamics of natural and synthetic microswimmers from bacterial cells to self-propelled particles in high-throughput microfluidic devices. However, little is known about the effects of geometric confinement on the emergent global patterns in such s...

[Phys. Rev. E 91, 043008] Published Mon Apr 13, 2015

]]>In this paper we investigate linear transient growth of perturbation energy in Taylor-Couette flow of a Bingham fluid. The effects of yield stress on transient growth and the structure of the optimal perturbation are mainly considered for both the wide-gap case and the narrow-gap case. For this purp...

[Phys. Rev. E 91, 043202] Published Mon Apr 13, 2015

]]>In this paper we study updating effects on cellular automata rule space. We consider a subset of 6144 order-3 automata from the space of 262144 bidimensional outer-totalistic rules. We compare synchronous to asynchronous and sequential updatings. Focusing on two automata, we discuss how update chang...

[Phys. Rev. E 91, 042110] Published Fri Apr 10, 2015

]]>The noisy dynamics of chemical systems is commonly studied using either the chemical master equation (CME) or the chemical Fokker-Planck equation (CFPE). The latter is a continuum approximation of the discrete CME approach. It has recently been shown that for a particular system, the CFPE captures n...

[Phys. Rev. E 91, 042111] Published Fri Apr 10, 2015

]]>We propose a model of subdiffusion in which an external force is acting on a particle at all times not only at the moment of jump. The implication of this assumption is the dependence of the random trapping time on the force with the dramatic change of particles behavior compared to the standard con...

[Phys. Rev. E 91, 042112] Published Fri Apr 10, 2015

]]>Within mean-field theory we calculate universal scaling functions associated with critical Casimir forces for a system consisting of three parallel cylindrical colloids immersed in a near-critical binary liquid mixture. For several geometrical arrangements and boundary conditions at the surfaces of ...

[Phys. Rev. E 91, 042304] Published Fri Apr 10, 2015

]]>We probe the mechanisms at work in the build-up of thermoreversible gel networks, with the help of hybrid gelatin gels containing a controlled density of irreversible, covalent crosslinks (CLs), which we quench below the physical gelation temperature. The detailed analysis of the dependence on coval...

[Phys. Rev. E 91, 042305] Published Fri Apr 10, 2015

]]>As a polymeric system incorporating rigid molecules within its structure, the liquid-crystal network (LCN) has been envisaged as a novel heterogeneous material. Under the influence of external stimuli, the orientational order of the liquid-crystalline phase becomes dilute and overall anisotropy is h...

[Phys. Rev. E 91, 042503] Published Fri Apr 10, 2015

]]>The dynamics of a local community of competing species with weak immigration from a static regional pool is studied. Implementing the generalized competitive Lotka-Volterra model with demographic noise, a rich dynamics with four qualitatively distinct phases is unfolded. When the overall interspecie...

[Phys. Rev. E 91, 042705] Published Fri Apr 10, 2015

]]>We study synchronization in bipartite networks of phase oscillators with general nonlinear coupling and distributed time delays. Phase-locked solutions are shown to arise, where the oscillators in each partition are perfectly synchronized among themselves but can have a phase difference with the oth...

[Phys. Rev. E 91, 042906] Published Fri Apr 10, 2015

]]>We present a rigorous study of quantum diffusion of a relativistic particle subjected to a time-dependent random potential with δ correlation in time. We find that in the asymptotic time limit the particle wave packet spreads ballistically in contrast with the nonrelativistic case, which in the same...

[Phys. Rev. E 91, 042109] Published Thu Apr 09, 2015

]]> Using laser tweezers, two colloidal particles are held parallel to a uniformly flowing suspension of similarly sized bath particles at an effective volume fraction ϕ_{eff}=0.41. The local deformation in the bath suspension is imaged by confocal microscopy, and, concurrently, the drag forces exerted on ...

[Phys. Rev. E 91, 042303] Published Thu Apr 09, 2015

]]>Dynamic light scattering (DLS) experiments were performed on stretched sheets of liquid crystal elastomers (LCEs) swollen with a nematic solvent with different swelling ratios. We show that the obtained stress-strain curve and DLS data can still be explained with the concepts of semisoft elasticity....

[Phys. Rev. E 91, 042502] Published Thu Apr 09, 2015

]]>The sequence of a protein is not only constrained by its physical and biochemical properties under current selection, but also by features of its past evolutionary history. Understanding the extent and the form that these evolutionary constraints may take is important to interpret the information in...

[Phys. Rev. E 91, 042704] Published Thu Apr 09, 2015

]]>We study the quantum kicked rotator in the classically fully chaotic regime K=10 and for various values of the quantum parameter k using Izrailev's N-dimensional model for various N≤3000, which in the limit N→∞ tends to the exact quantized kicked rotator. By numerically calculating the eigenfunction...

[Phys. Rev. E 91, 042904] Published Thu Apr 09, 2015

]]>When applied to strongly nonlinear chaotic dynamics the extended Kalman filter (EKF) is prone to divergence due to the difficulty of correctly forecasting the forecast error probability density function. In operational forecasting applications ensemble Kalman filters circumvent this problem with emp...

[Phys. Rev. E 91, 042905] Published Thu Apr 09, 2015

]]>We consider a nine-partial-differential-equation (1-space and 1-time) model of plane Couette flow in which the degrees of freedom are severely restricted in the streamwise and cross-stream directions to study spanwise localization in detail. Of the many steady Eckhaus (spanwise modulational) instabi...

[Phys. Rev. E 91, 043005] Published Thu Apr 09, 2015

]]> We consider horizontal linear shear flow (shear rate denoted by Λ) under vertical uniform rotation (ambient rotation rate denoted by Ω_{0}) and vertical stratification (buoyancy frequency denoted by N) in unbounded domain. We show that, under a primary vertical velocity perturbation and a radial densit...

[Phys. Rev. E 91, 043006] Published Thu Apr 09, 2015

]]>We describe the dynamics of vapor nanobubbles in water, on the basis of simulations of a hydrodynamics phase-field model. This situation is relevant to recent experiments, where a water nanobubble is generated around a nanoparticle immersed in water, and heated by an intense laser pulse. We emphasiz...

[Phys. Rev. E 91, 043007] Published Thu Apr 09, 2015

]]>Fermi resonance is a phenomenon of quantum mechanical superposition, which most often occurs between normal and overtone modes in molecular systems that are nearly coincident in energy. We find that scarred resonances in deformed dielectric microcavities are the very phenomenon of Fermi resonance, t...

[Phys. Rev. E 91, 042903] Published Wed Apr 08, 2015

]]>Particles and fields are standard components in numerical calculations like transport simulations in nuclear physics and have well-understood dynamics. Still, a common problem is the interaction between particles and fields due to their different formal description. Particle interactions are discret...

[Phys. Rev. E 91, 043302] Published Wed Apr 08, 2015

]]>The progress of realizing colloidal structures mimicking natural forms of organization in condensed matter is inherently limited by the availability of suitable colloidal building blocks. To enable new forms of crystalline and quasicrystalline self-organization of colloids, we develop truncated pyra...

[Phys. Rev. E 91, 040501] Published Tue Apr 07, 2015

]]>A three-stranded DNA with short range base pairings only is known to exhibit a classical analog of the quantum Efimov effect, viz., a three-chain bound state at the two-chain melting point where no two are bound. By using a nonperturbative renormalization-group method for a rigid duplex DNA and a fl...

[Phys. Rev. E 91, 042105] Published Tue Apr 07, 2015

]]>We found that a nontrivial enhancement of network reciprocity for 2 × 2 prisoner's dilemma games can be achieved by coupling two mechanisms. The first mechanism presumes a larger strategy update neighborhood than the conventional first neighborhood on the underlying network. The second is the strate...

[Phys. Rev. E 91, 042106] Published Tue Apr 07, 2015

]]>Scaled Brownian motion (SBM) is widely used to model anomalous diffusion of passive tracers in complex and biological systems. It is a highly nonstationary process governed by the Langevin equation for Brownian motion, however, with a power-law time dependence of the noise strength. Here we study th...

[Phys. Rev. E 91, 042107] Published Tue Apr 07, 2015

]]>Bridging equilibrium and nonequilibrium statistical physics attracts sustained interest. Hallmarks of nonequilibrium systems include a breakdown of detailed balance, and an absence of a priori potential function corresponding to the Boltzmann-Gibbs distribution, without which classical equilibrium t...

[Phys. Rev. E 91, 042108] Published Tue Apr 07, 2015

]]>We consider the thermal undulation, or shape fluctuation, of an almost planar fluid membrane surrounded by the same near-critical binary fluid mixtures on both sides. A weak preferential attraction is assumed between the membrane and one component of the mixture. We use the Gaussian free-energy func...

[Phys. Rev. E 91, 042402] Published Tue Apr 07, 2015

]]>We developed two-photon scanning patterned illumination microscopy (2P-SPIM) for super-resolution two-photon imaging. Our approach used a traditional two-photon microscopy setup with temporally modulated excitation to create patterned illumination fields. Combing nine different illuminations and str...

[Phys. Rev. E 91, 042703] Published Tue Apr 07, 2015

]]> Preferential attachment, by which new nodes attach to existing nodes with probability proportional to the existing nodes' degree, has become the standard growth model for scale-free networks, where the asymptotic probability of a node having degree k is proportional to k^{−γ}. However, the motivation f...

[Phys. Rev. E 91, 042801] Published Tue Apr 07, 2015

]]>