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  • Highlights from the previous volumes
    EPL (IF 1.958) Pub Date : 2020-11-11
    Konopik M. et al., Gibbon John D., d'Hardemare Guillaume et al. and Trinhammer Ole L.

    Nonequilibrium information erasure below kTln2 Thin sets in three-dimensional Navier-Stokes turbulence Effects of time defects in modulated systems Subnuclear particle spectra without explicit quark masses?

    更新日期:2020-11-12
  • Renormalized perturbation theory at large expansion orders
    EPL (IF 1.958) Pub Date : 2020-11-05
    Riccardo Rossi, Fedor Šimkovic and Michel Ferrero

    We present a general formalism that allows for the computation of large-order renormalized expansions, effectively doubling the numerically attainable perturbation order of renormalized Feynman diagrams. We show that this formulation compares advantageously to the currently standard techniques due to its high efficiency, simplicity, and broad range of applicability. Our formalism permits to easily

    更新日期:2020-11-06
  • Effect of optimal uncoupling in enhancing synchronization stability in drive-response systems
    EPL (IF 1.958) Pub Date : 2020-11-03
    B. D. Sharmila, G. Sivaganesh and A. Arulgnanam

    In this paper, we report the implementation of the method of optimal uncoupling and its effect in enhancing the stability of synchronization in certain coupled third-order chaotic systems. The clipping of phase space of the response system to a finite width having certain orientation about the coordinate axes representing the state variables of the response system insists that those state variables

    更新日期:2020-11-04
  • A Hawkes process model for the propagation of COVID-19: Simple analytical results
    EPL (IF 1.958) Pub Date : 2020-11-03
    Juan V. Escobar

    We present a model for the COVID-19 epidemic that offers analytical expressions for the newly registered and latent cases. This model is based on an epidemic branching process with latency that is greatly simplified when the bare memory kernel is given by an exponential function as observed in this pandemic. We expose the futility of the concept of “bending the curve” of the epidemic as long as the

    更新日期:2020-11-04
  • Spontaneous symmetry breaking in quantum finance
    EPL (IF 1.958) Pub Date : 2020-11-03
    Ivan Arraut, Alan Au and Alan Ching-biu Tse

    We analyze the phenomena of spontaneous symmetry breaking in quantum finance by using as a starting point the Black-Scholes (BS) and the Merton-Garman (MG) equations expressed in the Hamiltonian form. In this scenario the martingale condition (state) corresponds to the vacuum state which becomes degenerate when the symmetry of the system is spontaneously broken. We then analyze the broken symmetries

    更新日期:2020-11-04
  • Phase transitions in optimal betting strategies
    EPL (IF 1.958) Pub Date : 2020-11-03
    L. Dinis, J. Unterberger and D. Lacoste

    Kelly's criterion is a betting strategy that maximizes the long-term growth rate, but which is known to be risky. Here, we find optimal betting strategies that gives the highest capital growth rate while keeping a certain low value of risky fluctuations. We then analyze the trade-off between the average and the fluctuations of the growth rate, in models of horse races, first for two horses then for

    更新日期:2020-11-04
  • Langevin models for non-homogeneous turbulent flows: Determination of the coefficients
    EPL (IF 1.958) Pub Date : 2020-11-03
    G. Sarnitsky and S. Heinz

    Stochastic turbulence models are supposed to significantly support future computational fluid dynamics developments via the design of realizable, stable dynamic simulation methods and by providing a basis for uncertainty quantification. However, there is the nontrivial question of how such stochastic models can be designed for general non-homogeneous and non-stationary flows. Two new approaches are

    更新日期:2020-11-04
  • Measurement of the annihilation decay rate of 2 3 S 1 positronium
    EPL (IF 1.958) Pub Date : 2020-11-03
    R. E. Sheldon, T. J. Babij, B. A. Devlin-Hill, L. Gurung and D. B. Cassidy

    We report a measurement of the annihilation decay rate of ##IMG## [http://ej.iop.org/images/0295-5075/132/1/13001/epl20342ieqn1.gif] {${2\,}^{3}\mathrm{S}_1$} positronium (Ps) atoms, ##IMG## [http://ej.iop.org/images/0295-5075/132/1/13001/epl20342ieqn2.gif] {$\Gamma_{\mathrm{exp}}({2\,}^{3}\mathrm{S}_1)$} . Ground state atoms optically excited to radiatively metastable ##IMG## [http://ej.iop.org/i

    更新日期:2020-11-04
  • Climate networks suggest Rossby-waves–related CO 2 concentrations to surface air temperature
    EPL (IF 1.958) Pub Date : 2020-11-03
    Na Ying, Dong Zhou, Zhangang Han, Qinghua Chen, Qian Ye, Zhigang Xue and Weiping Wang

    The role of carbon dioxide (CO 2 ) on global warming gained wide attention. Previous researches mainly focus on relationship between global average CO 2 concentrations and surface air temperature (SAT). Carbon satellites have proven that CO 2 concentrations have non-uniform spatio-temporal distributions. The relation between CO 2 concentrations from satellite observations and SAT is seldom reported

    更新日期:2020-11-04
  • Non-linear edge dynamics of an integer quantum Hall fluid
    EPL (IF 1.958) Pub Date : 2020-11-03
    Alberto Nardin and Iacopo Carusotto

    We report a theoretical study of the linear and nonlinear dynamics of edge excitations of an integer quantum Hall state of non-interacting fermions. New features beyond the chiral Luttinger liquid picture are anticipated to arise from the interplay of the curvature of the Landau level dispersion and of the Pauli exclusion principle. For long-wavelength perturbations, the microscopic numerical results

    更新日期:2020-11-04
  • Fano resonances induced by the topological magnetoelectric effect
    EPL (IF 1.958) Pub Date : 2020-11-03
    L. A. Castro-Enriquez and A. Martín-Ruiz

    We investigate the interaction between a topological insulator nanoparticle and a quantum dot in an impulse magnetic field. Since topological insulators are nonmagnetic, after the impulse has ended only the localised topological surface modes, which are quantised in terms of dipolar bosonic modes, couple dipolarly to the quantum dot. Hence, the hybrid system can be treated as a single bosonic mode

    更新日期:2020-11-04
  • Real and imaginary cat states of graphene and some of their properties
    EPL (IF 1.958) Pub Date : 2020-11-03
    P. Ghosh and P. Roy

    In this paper we construct real and imaginary cat states of graphene and examine some properties of such states. It has been shown that these cat states exhibit nonclassical features like oscillation of the distribution function, sub-Poissonian statistics and quadrature squeezing.

    更新日期:2020-11-04
  • Top-gate zinc-tin-oxide thin-film transistors based on organic gate insulator
    EPL (IF 1.958) Pub Date : 2020-11-03
    Lan Yue, Fanxin Meng and Dasen Ren

    The thin-film transistors (TFTs) using the pulsed-plasma-deposition–prepared amorphous Zn-Sn-O (a-ZTO) as active layer and the dip-coated polymethylmethacrylate (PMMA) as gate insulator were fabricated. The results display that the PMMA film shows anti-reflection phenomenon when the PMMA layer combines with the ZTO layer to form a double-layer configuration. Moreover, the oxygen vacancy existing in

    更新日期:2020-11-03
  • Intermittency, cascades and thin sets in three-dimensional Navier-Stokes turbulence
    EPL (IF 1.958) Pub Date : 2020-11-03
    John D. Gibbon

    Visual manifestations of intermittency in computations of three-dimensional Navier-Stokes fluid turbulence appear as the low-dimensional or “thin” filamentary sets on which vorticity and strain accumulate as energy cascades down to small scales. In order to study this phenomenon, the first task of this paper is to investigate how weak solutions of the Navier-Stokes equations can be associated with

    更新日期:2020-11-03
  • Non-extensive processes associated with heating of the Galactic disc
    EPL (IF 1.958) Pub Date : 2020-11-03
    C. A. P. Viana and D. B. de Freitas

    We analyse the mechanisms ruling galactic disc heating through the dynamics of space velocities U , V and W , extracted from the Geneva-Copenhagen catalogue. To do this, we use a model based on non-extensive statistical mechanics, where we derive the probability distribution functions that quantify the non-Gaussian effects. Furthermore, we find that the deviation q –1 at a given stellar age follows

    更新日期:2020-11-03
  • Nonequilibrium information erasure below kTln2
    EPL (IF 1.958) Pub Date : 2020-11-03
    M. Konopik, A. Friedenberger, N. Kiesel and E. Lutz

    Landauer's principle states that information erasure requires heat dissipation. While Landauer's original result focused on equilibrium memories, we here investigate the reset of information stored in a nonequilibrium state of a symmetric two-state memory. We derive a nonequilibrium generalization of the erasure principle and demonstrate that the corresponding bounds on heat and work may be reduced

    更新日期:2020-11-03
  • Boomerons in a 1-D lattice with only nearest-neighbor interactions
    EPL (IF 1.958) Pub Date : 2020-11-03
    Shmuel Katz and Sefi Givli

    We report on the existence of boomerons in a 1-D periodic lattice with no on-site potentials. Following an impact, a spatially localized wave phenomenon forms. This envelope wave packet, with frequency within the propagating band of small-amplitude waves, propagates into the chain, decelerates, and reverses direction without any external forcing. Our results show that this remarkable response requires

    更新日期:2020-11-03
  • Dynamical complexity in Swarm electron density time series using Block entropy
    EPL (IF 1.958) Pub Date : 2020-11-03
    G. Balasis, C. Papadimitriou, A. Z. Boutsi, I. A. Daglis, O. Giannakis, A. Anastasiadis, P. De Michelis and G. Consolini

    Our goal in this study is to investigate the dynamical complexity of the electron density profiles in the topside ionosphere as measured by the Swarm mission, employing the use of symbolic information-theoretic techniques. We perform a Block entropy analysis for a time interval associated with the most intense magnetic storm of solar cycle 24, which occurred on 17 March 2015. We produce entropy maps

    更新日期:2020-11-03
  • Modeling the decentralized optimization of communicative energy
    EPL (IF 1.958) Pub Date : 2020-10-12
    J. Vera and F. Urbina

    This paper integrates two different ways to face the emergence of communication systems. First, information-theoretic models argue for the emergence of Zipfian properties based on the minimization of communicative energy, combining speaker and hearer efforts. Second, decentralized agent-based models focus on the emergence of a shared communication system in a population of individuals. The main aim

    更新日期:2020-10-13
  • Large negative tension-impedance effect in a soft ferromagnetic microwire
    EPL (IF 1.958) Pub Date : 2020-10-12
    Tao Wang, Bicong Wang, Siyuan Liu, Yufeng Luo, Hengyu Li, Mei Liu, Jinjun Rao, Zhizheng Wu, Huayan Pu, Jun Luo and Shaorong Xie

    Large negative tension-impedance effect was found in a soft ferromagnetic FeCoNiBSiMo microwire, namely, the impedance of the microwire was greatly reduced by the presence of mechanical tensions at intermediate frequency. The impedance reductions could be attributed to the sharp declines of the cylindrical permeability induced by the mechanical tensions. High-frequency skin effect was decreased after

    更新日期:2020-10-13
  • Measurement-device–independent quantum secure direct communication: Direct quantum communication with imperfect measurement device and untrusted operator
    EPL (IF 1.958) Pub Date : 2020-10-12
    Tao Li, Zikai Gao and Zhenhua Li

    Quantum secure direct communication (QSDC) enables direct message transmission over quantum channels. Loopholes involved in practical apparatus, particularly nonideal measurement devices, provide a potential interface for attacking practical quantum communication. Measurement-device–independent (MDI) QSDC protocols deal with all side-channel attacks on practical measurement devices and directly transmit

    更新日期:2020-10-13
  • Erratum: Spatio-temporal propagation of COVID-19 pandemics
    EPL (IF 1.958) Pub Date : 2020-10-12
    Bnaya Gross, Zhiguo Zheng, Shiyan Liu, Xiaoqi Chen, Alon Sela, Jianxin Li, Daqing Li and Shlomo Havlin

    Original article: EPL [http://stacks.iop.org/EPL/131/58003] , 131 (2020) 58003 .

    更新日期:2020-10-13
  • Pattern formations driven by cyclic interactions: A brief review of recent developments
    EPL (IF 1.958) Pub Date : 2020-10-12
    A. Szolnoki, B. F. de Oliveira and D. Bazeia

    Lotka's seminal work ( Lotka A. J. , Proc. Natl. Acad. Sci. U.S.A. , 6 (1920) 410) “on certain rhythmic relations” is already one hundred years old, but the research activity about pattern formations due to cyclical dominance is more vibrant than ever. It is because non-transitive interactions have a paramount role on maintaining biodiversity and adequate human intervention into ecological systems

    更新日期:2020-10-13
  • Frequency mixing in a ferrimagnetic sphere resonator
    EPL (IF 1.958) Pub Date : 2020-10-12
    Cijy Mathai, Sergei Masis, Oleg Shtempluck, Shay Hacohen-Gourgy and Eyal Buks

    Frequency mixing in ferrimagnetic resonators based on yttrium iron garnet (YIG) and calcium vanadium bismuth iron garnet (CVBIG) is employed respectively for studying their nonlinear interactions. The ferrimagnetic Kittel mode is driven by applying a pump tone at a frequency close to resonance. We explore two nonlinear frequency mixing configurations. In the first one, mixing between a transverse pump

    更新日期:2020-10-13
  • Spatio-temporal propagation of COVID-19 pandemics
    EPL (IF 1.958) Pub Date : 2020-09-24
    Bnaya Gross, Zhiguo Zheng, Shiyan Liu, Xiaoqi Chen, Alon Sela, Jianxin Li, Daqing Li and Shlomo Havlin

    The coronavirus known as COVID-19 has spread worldwide since December 2019. Without any vaccination or medicine, the means of controlling it are limited to quarantine and social distancing. Here we study the spatio-temporal propagation of the first wave of the COVID-19 virus in China and compare it to other global locations. We provide a comprehensive picture of the spatial propagation from Hubei to

    更新日期:2020-09-25
  • Entropic considerations on the Universe and Universe-black hole systems
    EPL (IF 1.958) Pub Date : 2020-09-21
    H. Hadi, F. Darabi and Y. Heydarzade

    We study the entropic considerations on the Universe system and the Universe-black hole system, filled by cosmological constant or exotic quintessence-like and phantom-like fields having negative pressure, using their relevant entropic bounds. It turns out that for both systems these considerations single out the cosmological constant, among the negative pressure candidate fields, as the viable cosmological

    更新日期:2020-09-22
  • A tunable silicon-on-insulator valley Hall photonic crystal at telecommunication wavelengths
    EPL (IF 1.958) Pub Date : 2020-09-21
    ZhaoHui Dong, Feng Xu and Wenyao Liang

    Silicon-on-insulator (SOI) combined with topological photonics provides on-chip integrated photonic devices CMOS-compatibility and backscattering-suppression. Here we propose a tunable SOI-based valley Hall topological insulator with two nonequivalent air holes to break inversion symmetry. Due to free-carrier excitation, the real and imaginary parts of the refractive index are modified to cause a blue-shift

    更新日期:2020-09-22
  • Statistically significant observation of and cross-sections for a new nuclear reaction channel on 197 Au with bound dineutron escape
    EPL (IF 1.958) Pub Date : 2020-09-21
    Ihor M. Kadenko, Barna Biró and András Fenyvesi

    A new nuclear reaction channel on 197 Au with the neutron as a projectile and a bound dineutron ( 2 n) as an ejectile in the output channel is considered based on available experimental observations. The dineutron is assumed to be formed as a particle satellite, separated from the volume but not from the potential well of the 196 Au nucleus. The dineutron was identified by statistically significant

    更新日期:2020-09-22
  • The classical Doppler-broadened absorption line profile due to thermal effect
    EPL (IF 1.958) Pub Date : 2020-09-20
    Young-Sea Huang

    The classical Doppler-broadened absorption line profile, which is exactly derived by the classical Doppler effect and Maxwell speed distribution for the first time, is asymmetrically broadened with red-shift more than blue-shift, and its peak is red-shifted. Nonetheless, the half-width at half-maximum in the blue-shift wing is larger than that in the red-shift wing. The classical Doppler-broadened

    更新日期:2020-09-21
  • Multiband effect in elastoresistance of Fe(Se,Te)
    EPL (IF 1.958) Pub Date : 2020-09-20
    Y. A. Ovchenkov, D. A. Chareev, D. E. Presnov, I. G. Puzanova, O. S. Volkova and A. N. Vasiliev

    We have investigated the elastoresistance of two ##IMG## [http://ej.iop.org/images/0295-5075/131/5/57001/epl20272ieqn1.gif] {${\text{FeSe}}_{1-x}$} Te x ( ##IMG## [http://ej.iop.org/images/0295-5075/131/5/57001/epl20272ieqn2.gif] {$x\approx 0.4\text{--}0.5$} ) compounds that have a close chemical composition but differ significantly in electronic properties. The first compound has a negative temperature

    更新日期:2020-09-21
  • A variant of the unknotting number of a knot with applications to the topology of biomolecules
    EPL (IF 1.958) Pub Date : 2020-09-20
    U. Ali, M. Saleem, A. M. Qureshi, I. Riaz, M. Shah and W. Gao

    The creation of unwound or unknotted loops of DNA is facilitated by topoisomerases, which alter the conformation of DNA by cleaving the phosphate backbone on one or both the strands. A major unexplored question has been the possibility of topoisomerases failing to unpack supercoiled DNA on any one of the several knots, thereby failing to initiate the unwinding process. Computing the unknotting number

    更新日期:2020-09-21
  • Measurement of modular values and connection to the annihilation operator
    EPL (IF 1.958) Pub Date : 2020-09-20
    Xiaogang Li and Jiancun Gao

    Modular value of an observable of a pre- and postselected quantum system is a concept similar to weak value, but in contrast to describing only weak coupling, it can describe the coupling of any strength but only for qubit meters, so it may be used more widely in some scenarios. Besides, modular value has been proved to have advantages on measuring weak values of nonlocal joint observables and nonlocal

    更新日期:2020-09-21
  • Measurements of microwave scattering by ultrasound in air at oblique incidence
    EPL (IF 1.958) Pub Date : 2020-09-20
    Niklas Wingren and Daniel Sjöberg

    Scattering of electromagnetic waves against acoustic waves has been studied in acousto-optics and radio acoustic sounding of the atmosphere, among others. Strong interaction requires phase matching, which occurs at two angles between waves. These depend on the wavelength ratio. The scattered electromagnetic wave is frequency shifted by the acoustic frequency, either up or down depending on the angle

    更新日期:2020-09-21
  • Kinematic basis of emergent energetics of complex dynamics
    EPL (IF 1.958) Pub Date : 2020-09-20
    Hong Qian, Yu-Chen Cheng and Ying-Jen Yang

    Stochastic kinematic description of a complex dynamics is shown to dictate an energetic and thermodynamic structure. An energy function ##IMG## [http://ej.iop.org/images/0295-5075/131/5/50002/epl20266ieqn1.gif] {$\varphi(\textbf{x})$} emerges as the limit of the generalized, nonequilibrium free energy of a Markovian dynamics with vanishing fluctuations. In terms of the ∇ φ and its orthogonal field

    更新日期:2020-09-21
  • Extraordinary characteristics of one-dimensional PT-symmetric ring optical waveguide networks with near-isometric and isometric arms
    EPL (IF 1.958) Pub Date : 2020-09-17
    Haiying Li, Xiangbo Yang, Jiaye Wu and Xuhang Wu

    We construct one-dimensional ##IMG## [http://ej.iop.org/images/0295-5075/131/5/54001/epl20249ieqn2.gif] {$\cal{PT}$} -symmetric ring optical waveguide networks with near-isometric and isometric arms and investigate their extraordinary optical properties. It is found that the features for the former and the latter are quite different, although extraordinary ultrastrong transmission and reflection exist

    更新日期:2020-09-21
  • A network-based method for detecting critical events of correlation dynamics in financial markets
    EPL (IF 1.958) Pub Date : 2020-09-17
    Chun-Xiao Nie

    In recent years, the dynamics of the financial correlation matrix has been widely studied. This study applies the Frobenius distance-based kNN ( k nearest neighbour) network to analyse the time-varying characteristics of the correlation matrix, especially during the period of drastic change. We use the influence-strength ( IS ) index to detect when the correlation matrix structure changes dramatically

    更新日期:2020-09-20
  • Resonant nano-electromechanical systems from 2D materials
    EPL (IF 1.958) Pub Date : 2020-09-17
    Kai-Ming Hu, Peng Bo, Xiu-Yuan Li, Yi-Hang Xin, Xin-Ru Bai, Lei Li and Wen-Ming Zhang

    Intriguing mechanical properties of two-dimensional (2D) atomically thin materials make them well suit for a new class of resonant NEMS. Resonant 2D NEMS show high fundamental frequencies, outstanding tenability and broad dynamic range due to the ultrahigh strength, ultralow mass density and ultrahigh strain stretchability. Recent work toward exploring fabrication and transduction techniques, device

    更新日期:2020-09-20
  • Equal partners do better in defensive alliances
    EPL (IF 1.958) Pub Date : 2020-09-17
    Marcell Blahota, István Blahota and Attila Szolnoki

    Cyclic dominance offers not just a way to maintain biodiversity, but also serves as a sort of defensive alliance against an external invader. Interestingly, a new level of competition can be observed when two cyclic loops are present. Here the inner invasion speed plays a decisive role on the evolutionary outcome, because faster invasion rate provides an evolutionary advantage to an alliance. In this

    更新日期:2020-09-20
  • Rydberg antiblockade regimes: Dynamics and applications
    EPL (IF 1.958) Pub Date : 2020-09-16
    S.-L. Su, F.-Q. Guo, J.-L. Wu, Z. Jin, X. Q. Shao and S. Zhang

    Rydberg antiblockade (RAB) allows more than one Rydberg atom to be excited in the presence of Rydberg-Rydberg interaction (RRI) and has many potential applications in quantum optics, many-body physics and quantum information. In this paper, we would review the conditions and possible applications of different types of RAB regimes under weak, intermediate and strong RRIs, respectively. Both van der

    更新日期:2020-09-18
  • Measurement-device–independent quantum secure direct communication of multiple degrees of freedom of a single photon
    EPL (IF 1.958) Pub Date : 2020-09-07
    Zi-Kang Zou, Lan Zhou, Wei Zhong and Yu-Bo Sheng

    Quantum secure direct communication (QSDC) can realize the direct and secure transmission of information instead of sharing secure keys between two parties. Similar to quantum key distribution (QKD), in practical applications, QSDC may suffer from attacks from imperfect detector. Measurement-device–independent QSDC (MDI-QSDC) can remove all attacks at detector's side and close all loopholes in the

    更新日期:2020-09-08
  • f(R) gravity and Tsallis holographic dark energy
    EPL (IF 1.958) Pub Date : 2020-09-06
    P. S. Ens and A. F. Santos

    The f ( R ) gravity theory is considered. It is a gravitational theory that generalizes the Einstein-Hilbert action. In this context, a holographic dark energy model is studied. Tsallis non-extensive entropy is used to introduce the dark energy density based on the holographic principle. Then the Friedmann equation, deceleration parameter, and equation of state for this model are investigated.

    更新日期:2020-09-08
  • Lost in normalization
    EPL (IF 1.958) Pub Date : 2020-09-06
    Narges Vadood and Amir H. Fatollahi

    The consequences of the gauge-coupling–dependent normalization factor of ##IMG## [http://ej.iop.org/images/0295-5075/131/4/41003/epl20258ieqn1.gif] {$1/g^{\alpha}$} in the transfer matrix of 2d U (1) lattice gauge theory are explored. It is seen by the ##IMG## [http://ej.iop.org/images/0295-5075/131/4/41003/epl20258ieqn2.gif] {$\alpha=1$} choice that the lowest energy develops a minimum at coupling

    更新日期:2020-09-08
  • Effect of spacing on evaporation and internal circulation of two identical drops
    EPL (IF 1.958) Pub Date : 2020-09-06
    Vartika Singh, Suraj Prasad, Ankit Das, S. Narayanan and Deepak Kumar Mandal

    When two identical drops evaporate simultaneously in close vicinity, the vapours of one drop affect the evaporation of the neighbouring one. The evaporation rate is found to decrease. The effect decreases when the in between spacing increases. The internal circulation, which is visualized, is observed to show the same behaviour. The circulation is slower for the nearer drops, but increases and becomes

    更新日期:2020-09-08
  • Restoring number conservation in quadratic bosonic Hamiltonians with dualities
    EPL (IF 1.958) Pub Date : 2020-09-06
    Vincent P. Flynn, Emilio Cobanera and Lorenza Viola

    Number-non-conserving terms in quadratic bosonic Hamiltonians can induce unwanted dynamical instabilities. By exploiting the pseudo-Hermitian structure built in to these Hamiltonians, we show that as long as dynamical stability holds, one may always construct a non-trivial dual (unitarily equivalent) number-conserving quadratic bosonic Hamiltonian. We exemplify this construction for a gapped harmonic

    更新日期:2020-09-08
  • How to generate the tip of branching random walks evolved to large times
    EPL (IF 1.958) Pub Date : 2020-09-06
    É. Brunet, A. D. Le, A. H. Mueller and S. Munier

    In a branching process, the number of particles increasesexponentially with time, which makes numerical simulations for large timesdifficult. In many applications, however, only the region close to the extremalparticles is relevant (the “tip”). We present a simple algorithmwhich allows to simulate a branching random walk in one dimension, keepingonly the particles that arrive within some distance of

    更新日期:2020-09-08
  • Locating source of heterogeneous propagation model by universal algorithm
    EPL (IF 1.958) Pub Date : 2020-09-06
    Hong-Jue Wang and Kai-Jia Sun

    We focus on locating propagation source in complex networks. A novel and simple universal algorithm is proposed to accurately locate source of different heterogeneous propagation models by using only limited observed information without knowing anything about propagation models in advance. An observer nodes selecting strategy is proposed to improve the source locating accuracy of the proposed algorithm

    更新日期:2020-09-08
  • Barrier crossing in the presence of multi-exponential memory functions with unequal friction amplitudes and memory times
    EPL (IF 1.958) Pub Date : 2020-09-06
    Laura Lavacchi, Julian Kappler and Roland R. Netz

    We study the non-Markovian Langevin dynamics of a massive particle in a one-dimensional double-well potential in the presence of multi-exponential memory by simulations. We consider memory functions as the sum of two or three exponentials with different friction amplitudes ##IMG## [http://ej.iop.org/images/0295-5075/131/4/40004/epl20260ieqn1.gif] {$\gamma_i$} and different memory times ##IMG## [http://ej

    更新日期:2020-09-08
  • Improvement of CO 2 absorption by ionic liquid electrospray
    EPL (IF 1.958) Pub Date : 2020-09-02
    H. Takana, K. Yamamoto, T. Makino and M. Kanakubo

    In this study, an innovative approach for the selective absorption of carbon dioxide (CO 2 ) by ionic liquid electrospray was proposed. First, the fluid dynamical characteristics of ionic liquid electrospray with 1-ethyl-3-methylimidazolium acetate in ambient air was clarified by high-speed imaging and aerosol analysis. This was followed by enhancement of CO 2 absorption by ionic liquid electrospray

    更新日期:2020-09-03
  • The optimal oscillation mode in excitable small-world networks
    EPL (IF 1.958) Pub Date : 2020-09-02
    Yu Qian, Chi Zhang, Zegang Wei, Fei Liu, Chenggui Yao and Zhigang Zheng

    The problem of oscillation mode recognition is one of the most important issues under investigation in the field of biological systems. In this paper, we have systematically investigated the optimal oscillation mode (OOM) identification in excitable small-world networks (ESWNs). It has been shown that rewiring probability, coupling strength and system size are the three determinants that can effectively

    更新日期:2020-09-03
  • Revealing hidden symmetries and gauge invariance of the massive Carroll-Field-Jackiw model
    EPL (IF 1.958) Pub Date : 2020-09-02
    Paulo R. F. Alves, Cleber N. Costa, Everton M. C. Abreu, Jorge Ananias Neto and Albert C. R. Mendes

    In this paper we have analyzed the improved version of the Gauge Unfixing (GU) formalism of the massive Carroll-Field-Jackiw model, which breaks both the Lorentz and gauge invariances, to disclose hidden symmetries to obtain gauge invariance, the key stone of the Standard Model. In this process, as usual, we have converted this second-class system into a first-class one and we have obtained two gauge

    更新日期:2020-09-03
  • Fuzzy dark matter and neutron Majorana mass from gravitational instantons
    EPL (IF 1.958) Pub Date : 2020-09-02
    Andrea Addazi

    We explore the possibility that a super-light candidate for fuzzy (or wave) Dark Matter (fDM) may be a new composite boson state of fermions, rather than an axion-like Bose-Einstein condensate. We start from string-inspired massless Majorana fermions χ thought as super-modulini fields from string compactifications. We show that massless (or nearly massless) fermions can form a Bose-Einstein condensate

    更新日期:2020-09-03
  • Cutting off the non-Hermitian boundary from an anomalous Floquet topological insulator
    EPL (IF 1.958) Pub Date : 2020-09-02
    Bastian Höckendorf, Andreas Alvermann and Holger Fehske

    In two-dimensional anomalous Floquet insulators, non-Hermitian boundary state engineering can be used to completely separate chiral boundary states from bulk bands in the quasienergy spectrum. The topological properties of such spectrally separated boundary states are no longer restricted by the strict bulk-boundary correspondence of Hermitian systems. We show that this additional topological freedom

    更新日期:2020-09-03
  • How the intimate relationship affects the individuals' behaviors in a two-layer network
    EPL (IF 1.958) Pub Date : 2020-09-02
    Jie Lu, Linrong Zhang and Mengyun Wu

    Game theories could help us to understand the origin of the emergence and persistence of cooperation among selfish individuals. Considering the intimate relationship among individuals, we study the prisoner's dilemma (PD) game in a two-layer network. Firstly, we calculate the closeness between any two players according to their connectivity. Further, we define and obtain one's comprehensive income

    更新日期:2020-09-03
  • A continuum study of ionic layer analysis for single species ion transport in coaxial carbon nanotubes
    EPL (IF 1.958) Pub Date : 2020-09-02
    Yue Chan

    In this letter, we employ the Poisson-Nernst-Planck equation and the continuum molecular model to investigate the ionic layers formation in coaxial carbon nanotubes, which are crucial for understanding the ion transport in nanomaterials, as well as modern solar cells and batteries. Owing to the curvature of nanotubes and the strong ion-nanotubes interactions, our simulations show that stable ionic

    更新日期:2020-09-03
  • Closed-loop three-level charged quantum battery
    EPL (IF 1.958) Pub Date : 2020-09-02
    Fu-Quan Dou, Yuan-Jin Wang and Jian-An Sun

    Quantum batteries are energy storage or extraction devices in a quantum system. Here, we present a closed-loop quantum battery by utilizing a circularly coupled three-state quantum system, and investigate its charging dynamics. The charging performance is greatly improved due to the existence of the third field in the system to form a closed-contour interaction. Through appropriately selecting the

    更新日期:2020-09-03
  • Electromagnetic vortex solitons in the magnetospheres of super-Eddington AGN
    EPL (IF 1.958) Pub Date : 2020-09-02
    V. I. Berezhiani and Z. Osmanov

    Propagation and dynamics of electromagnetic vortex solitons have been studied in the electron positron ion plasmas of super-Eddington active galactic nuclei (AGN). Existence and stability of such structures is demonstrated for highly transparent AGN plasma media. Possible implications of dynamical features and corresponding observational signatures are discussed.

    更新日期:2020-09-03
  • Spin-half bosons with mass dimension three-half: Towards a resolution of the cosmological constant problem
    EPL (IF 1.958) Pub Date : 2020-09-02
    Dharam Vir Ahluwalia

    We have constructed a very different type of particle than any presently known. It is a boson and resides in the ##IMG## [http://ej.iop.org/images/0295-5075/131/4/41001/epl20257ieqn1.gif] {$(1/2,0)\oplus(0,1/2)$} representation space. The associated local field has mass dimension three-half. These new bosons can only be created or destroyed in pairs. When paired with a fermion the total zero point

    更新日期:2020-09-03
  • Wigner's friend, Feynman's paths and material records
    EPL (IF 1.958) Pub Date : 2020-09-02
    A. Matzkin and D. Sokolovski

    The place and role of an Observer in quantum mechanics has been a subject of an ongoing debate since the theory's inception. Wigner brought this question to the fore in a celebrated scenario in which a super-Observer observes a Friend making a measurement. Here we briefly review why this “Wigner Friend scenario” has been taken to require the introduction of the Observer's consciousness, or alternatively

    更新日期:2020-09-03
  • Confronting γ-rays from singlet fermionic cold dark matter with the H.E.S.S. data
    EPL (IF 1.958) Pub Date : 2020-09-02
    R. Moazzemi

    We explore the whole parameter space of the singlet fermionic cold-dark-matter model with respect to constraints on, first, the relic density and second, gamma-ray lines up to 10 TeV. We investigate 44000 random sample models which comprehensively scan the parameter space for dark-matter mass below 10 TeV, and compare our results with the latest experimental data from H.E.S.S., for the first time.

    更新日期:2020-09-03
  • Inhomogeneous superconductivity in high-density nonmagnetic cobalt in a polycrystalline Co film
    EPL (IF 1.958) Pub Date : 2020-09-02
    Nasrin Banu, M. Aslam, Arpita Paul, Sanjib Banik, S. Das, S. Datta, A. Roy, I. Das, G. Sheet, U. V. Waghmare, S. Ramakrishnan and B. N. Dev

    We report the observation of inhomogeneous superconductivity (ISC) in the recently discovered high-density nonmagnetic (NM) phase of Co in thin films below an onset temperature ( ##IMG## [http://ej.iop.org/images/0295-5075/131/4/47001/epl20262ieqn1.gif] {$T_{\mathrm{C}}$} ) of 5.4 K in the absence of external magnetic field, via four-probe measurements of resistivity. Further, the point-contact spectroscopy

    更新日期:2020-09-03
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