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13 papers · 1 filter
Generalization of Clauses under Implication
P. Idestam-Almquist
In the area of inductive learning, generalization is a main operation, and the usual definition of induction is based on logical implication. Recently there has been a rising inter…
Barbero's Hamiltonian derived from a generalized Hilbert-Palatini action
Sören Holst
Barbero recently suggested a modification of Ashtekar's choice of canonical variables for general relativity. Although leading to a more complicated Hamiltonian constraint this mod…
Limits on direct detection of neutralino dark matter from b -> s gamma decays
L. Bergstrom, P. Gondolo
We analyze the rate of detection of minimal supersymmetric neutralino dark matter in germanium, sapphire and sodium iodide detectors, imposing cosmological and recent accelerator b…
Twistor Phase Space Dynamics and the Lorentz Force Equation
Andreas Bette
Using Lorentz force equation as an input a Hamiltonian mechanics on the non-projective two twistor phase space TxT is formulated. Such a construction automatically reproduces dynam…
Neighbours of Einstein's Equations: Connections and Curvatures
Ingemar Bengtsson
Once the action for Einstein's equations is rewritten as a functional of an SO(3,C) connection and a conformal factor of the metric, it admits a family of ``neighbours'' having the…
Predictability in Systems with Many Characteristic Times: The Case of Turbulence
E. Aurell, G. Boffetta, A. Crisanti +2
In chaotic dynamical systems, an infinitesimal perturbation is exponentially amplified at a time-rate given by the inverse of the maximum Lyapunov exponent . In fully developed…