Física de la Matèria Condensada: Recent submissions
Now showing items 241-260 of 1279
Determinants of population responses to environmental fluctuations
Environmental fluctuations, such as changing conditions and variable nutrient availability, are an unavoidable component of the dynamics of virtually all populations. They affect populations in ways that are often difficult ...
Analyzing user activity on Twitter during long-lasting crisis events: a case study of the Covid-19 crisis in Spain
A pandemic crisis like the Covid-19 outbreak is a complex event, involving numerous aspects of the social life on multiple temporal scales. Focusing on the Spanish Twittersphere, we characterized users' activity behavior ...
Geometric detection of hierarchical backbones in real networks
Hierarchies permeate the structure of real networks, whose nodes can be ranked according to different features. However, networks are far from treelike structures and the detection of hierarchical ordering remains a ...
Supersampling and network reconstruction of urban mobility
Understanding human mobility is of vital importance for urban planning, epidemiology, and many other fields that draw policies from the activities of humans in space. Despite the recent availability of large-scale data ...
Quantum-to-classical crossover in full counting statistics
The reduction of quantum scattering leads to the suppression of shot noise. In this Letter, we analyze the crossover from the quantum transport regime with universal shot noise to the classical regime where noise vanishes. ...
Dynamical properties of the Zhang model of self-organized criticality
Critical exponents of the infinitely slowly driven Zhang model of self-organized criticality are computed for d=2 and 3, with particular emphasis devoted to the various roughening exponents. Besides confirming recent ...
Nonperturbative semiclassical stability of de Sitter spacetime for small metric deviations
We consider the linearized semiclassical Einstein equations for small deviations around de Sitter spacetime including the vacuum polarization effects of conformal fields. Employing the method of order reduction, we find ...
Participatory design of citizen science experiments
This article describes and analyzes the collaborative design of a citizen science research project through cocreation. Three groups of secondary school students and a team of scientists conceived three experiments on human ...
Bosonic versus fermionic pairs of topological spin defects in monolayered high-Tc superconductors
The energy associated with bosonic and fermionic pairs of topological spin defects in doped antiferromagnetic quantum spin- 1 ∕ 2 square lattice is estimated within a resonating valence bond scenario, as described by ...
Many worlds in one
A generic prediction of inflation is that the thermalized region we inhabit is spatially infinite. Thus, it contains an infinite number of regions of the same size as our observable universe, which we shall denote as O ...
Friction induces anisotropic propulsion in sliding magnetic microtriangles
In viscous fluids, motile microentities such as bacteria or artificial swimmers often display different transport modes than macroscopic ones. A current challenge in the field aims at using friction asymmetry to steer the ...
Front form and point form formulation in P.R.M. noninteractions theorems
The front form and the point form of dynamics are studied in the framework of predictive relativistic mechanics. The non-interaction theorem is proved when a Poincar-invariant Hamiltonian formulation with canonical position ...
New knowledge environments: On the possibility of a citizen social science
Citizen science is in a process of consolidation, with a wide variety of practices and perspectives. Social sciences and humanities occupy a small space despite the obvious social dimension of citizen science. In this ...
Crossover from three-dimensional to two-dimensional systems in the nonequilibrium zero-temperature random-field Ising model
We present extensive numerical studies of the crossover from three-dimensional to two-dimensional systems in the nonequilibrium zero-temperature random-field Ising model with metastable dynamics. Bivariate finite-size ...
Multiphase magnetic deflagrations in a Nd5Ge3 single crystal
We report magnetic deflagration phenomena ocurring in both antiferromagnetic and ferromagnetic phases in a single crystal of the intermetallic compound Nd5Ge3. We have investigated, using a trigger heat pulse, the spatial ...
Consensus in networks of mobile communicating agents
Populations of mobile and communicating agents describe a vast array of technological and natural systems, ranging from sensor networks to animal groups. Here, we investigate how a group-level agreement may emerge in the ...
Gravitational field of superconducting cosmic strings
A Comment on the Letter by E. Copeland, H. Hindmarsh, and N. Turok, Phys. Rev. Lett. 58, 1910 (1987).
Mesoscopic Thermodynamics for the Dynamics of Small-Scale Systems
We analyze the mesoscopic dynamics of small-scale systems from the perspective of mesoscopic non-equilibrium thermodynamics. The theory obtains the Fokker-Planck equation as a diffusion equation for the probability density ...
Percolation analysis of force networks in anisotropic granular matter
We study the percolation properties of force networks in an anisotropic model for granular packings, the so-called q-model. Following the original recipe of Ostojic et al (2006 Nature 439 828), we consider a percolation ...
Evidence of the anomalous charge state 57Fe4+ in the nuclear decay of 57Co3+
The first observation of the elusive Fe4+ charge state coming from the nuclear decay of 57Co3+ has been found in the Mössbauer emission spectra of 57Co:La2Li0.5Co0.5O4. A Ti-doped sample was prepared in order to show that ...
