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54 papers · 1 filter
The SIR epidemic model from a PDE point of view
Fabio A. C. C. Chalub, Max O. Souza
We present a derivation of the classical SIR model through a mean-field approximation from a discrete version of SIR. We then obtain a hyperbolic forward Kolmogorov equation, and s…
Equivalence between Zwanziger's horizon function and Gribov's no-pole ghost form factor
A. J. Gomez, M. S. Guimaraes, R. F. Sobreiro +1
The ghost form factor entering the Gribov no-pole condition is evaluated till the third order in the gauge fields. The resulting expression turns out to coincide with Zwanziger's h…
Lorentz and CPT violation in QED revisited: A missing analysis
Oswaldo M. Del Cima, Jakson M. Fonseca, Daniel H. T. Franco +1
We investigate the breakdown of Lorentz symmetry in QED by a CPT violating interaction term consisting of the coupling of an axial fermion current with a constant vector field ,…
Nonadditive entropy for random quantum spin-S chains
A. Saguia, M. S. Sarandy
We investigate the scaling of Tsallis entropy in disordered quantum spin-S chains. We show that an extensive scaling occurs for specific values of the entropic index. Those values…
Solution of an associating lattice gas model with density anomaly on a Husimi lattice
T. J. Oliveira, J. F. Stilck, M. A. A. Barbosa
We study a model of a lattice gas with orientational degrees of freedom which resemble the formation of hydrogen bonds between the molecules. In this model, which is the simplified…
Entanglement and local extremes at an infinite-order quantum phase transition
C. C. Rulli, M. S. Sarandy
The characterization of an infinite-order quantum phase transition (QPT) by entanglement measures is analyzed. To this aim, we consider two closely related solvable spin-1/2 chains…