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11 papers · 1 filter
Physics of Psychophysics: it is critical to sense
Mauro Copelli
It has been known for about a century that psychophysical response curves (perception of a given physical stimulus vs. stimulus intensity) have a large dynamic range: many decades…
The Ferromagnetic Potts model under an external magnetic field: an exact renormalization group approach
Sergio Coutinho, Welles A. M. Morgado, Evaldo M. F. Curado +1
The q-state ferromagnetic Potts model under a non-zero magnetic field coupled with the 0^th Potts state was investigated by an exact real-space renormalization group approach. The…
Spectroscopic observation of the rotational Doppler effect
S. Barreiro, J. W. R. Tabosa, H. Failache +1
We report on the first spectroscopic observation of the rotational Doppler shift associated with light beams carrying orbital angular momentum. The effect is evidenced as the broad…
Scaling law for the transient behavior of type-II neuron models
Miguel Angel Durán Roa, Mauro Copelli, Osame Kinouchi +1
We study the transient regime of type-II biophysical neuron models and determine the scaling behavior of relaxation times near but below the repetitive firing critical current,…
Spin-glass behaviour on random lattices
M. O. Hase, J. R. L. de Almeida, S. R. Salinas
The ground-state phase diagram of an Ising spin-glass model on a random graph with an arbitrary fraction of ferromagnetic interactions is analysed in the presence of an externa…
Characterizing the NP-PSPACE Gap in the Satisfiability Problem for Modal Logic
Joseph Y. Halpern, Leandro Chaves Rego
There has been a great of work on characterizing the complexity of the satisfiability and validity problem for modal logics. In particular, Ladner showed that the validity problem…