35 citations · 102 across the 12 of their papers we have counts for
14 papers
On the duration of face-to-face contacts
Stephane Plaszczynski, Gilberto Nakamura, Basile Grammaticos +1
The analysis of social networks, in particular those describing face-to-face interactions between individuals, is complex due to the intertwining of the topological and temporal as…
How long do we stand our colleagues? A universal behavior in face-to-face relations
Stephane Plaszczynski, Gilberto Nakamura
We compare face-to-face interaction data recorded by wearable sensors in various sociological environments. The interactions among individuals display a clear environment-dependent…
Levy geometric graphs
S. Plaszczynski, G. Nakamura, C. Deroulers +2
We present a new family of graphs with remarkable properties. They are obtained by connecting the points of a random walk when their distance is smaller than a given scale. Their d…
Modeling cooperation and competition in biological communities
F. Meloni, G. Nakamura, B. Grammaticos +2
The far-reaching consequences of ecological interactions in the dynamics of biological communities remain an intriguing subject. For decades, competition has been a cornerstone in…
Dispersal and organization of polarized cells: non-linear diffusion and cluster formation without adhesion
G. Nakamura, M. Badoual, E. Fabiani +1
Experimental studies of cell motility in culture have shown that under adequate conditions these living organisms possess the ability to organize themselves into complex structures…
Confinement strategies in a simple SIR model
G. Nakamura, B. Grammaticos, M. Badoual
We propose a simple SIR model in order to investigate the impact of various confinement strategies on a most virulent epidemic. Our approach is motivated by the current COVID-19 pa…
Hamiltonian dynamics of the SIS epidemic model with stochastic fluctuations
Gilberto M. Nakamura, Alexandre S. Martinez
Empirical records of epidemics reveal that fluctuations are important factors for the spread and prevalence of infectious diseases. The exact manner in which fluctuations affect sp…
Cooperation risk and Nash equilibrium: quantitative description for realistic players
G. M. Nakamura, G. S. Contesini, A. S. Martinez
The emergence of cooperation figures among the main goal of game theory in competitive-cooperative environments. Potential games have long been hinted as viable alternatives to stu…
Many-body methods in agent-based epidemic models
Gilberto M. Nakamura, Alexandre S. Martinez
The susceptible-infected-susceptible (SIS) agent-based model is usually employed in the investigation of epidemics. The model describes a Markov process for a single communicable d…
Finite symmetries in agent-based epidemic models
Gilberto M. Nakamura, Ana Carolina P. Monteiro, George C. Cardoso +1
We present an algorithm which explores permutation symmetries to describe the time evolution of agent-based epidemic models. The main idea to improve computation times relies on re…
Fast computation method for comprehensive agent-level epidemic dissemination in networks
Gilberto M. Nakamura, Ana Carolina P. Monteiro, George C. Cardoso +1
Two simple agent based models are often employed in epidemic studies: the susceptible-infected (SI) and the susceptible-infected-susceptible (SIS). Both models describe the time ev…
Gluon Propagators in Linear Covariant Gauge
Attilio Cucchieri, Tereza Mendes, Gilberto M. Nakamura +1
The implementation of the linear covariant gauge on the lattice faces a conceptual problem: using the standard compact discretization, the gluon field is bounded, while the four-di…
Feynman gauge on the lattice: new results and perspectives
Attilio Cucchieri, Tereza Mendes, Gilberto M. Nakamura e Elton M. S. Santos
We have recently introduced a new implementation of the Feynman gauge on the lattice, based on a minimizing functional that extends in a natural way the Landau-gauge case, while pr…
Phase diagram and spectral properties of a new exactly integrable spin one quantum chain
Francisco C. Alcaraz, Gilberto M. Nakamura
The spectral properties and phase diagram of the exact integrable spin one quantum chain introduced by Alcaraz and Bariev are presented. The model has a U(1) symmetry and its integ…