Roberto Caimmi

Learn More
The fossil record of early hominids suggests that their Arm length, and presumably stature and weight, had a tendency to increase. Using the minimum jerk principle and a related formulation of averaged specific power, ASP, with regard to selected two-joint Arm movements, the current paper explores relationships between ASP, hand trajectory length (or Arm(More)
Population dynamics of tRNA-like macromolecules and viruses have been interpreted by Eigen (1971, Naturwissenschaften58, 465-526) on the basis of the "quasispecies" model. The present paper contains a qualitative analysis of the similarities between Eigen's quasispecies model and percolation models. In fact, different phenomena characterized by an analogous(More)
With regard to homeoidally striated Jacobi ellipsoids (Caimmi & Marmo 2005), a unified theory of systematically rotating and peculiar motions is developed, where both real and imaginary rotation (around a fixed axis) are considered. The effect of positive or negative residual motion excess, is shown to be equivalent to an additional real or imaginary(More)
Simulated dark matter haloes are fitted by self-similar, universal density profiles, where the scaled parameters depend only on a scaled (truncation) radius, Ξ = R/r 0 , which, in turn, is supposed to be independent on the mass and the formation redshift. The further assumption of a lognormal distribution (for a selected mass bin) of the scaled radius, or(More)
The current paper is aimed in getting more insight on three main points concerning large-scale astrophysical systems, namely: (i) formulation of tensor virial equations from the standpoint of analytical mechanics; (ii) investigation on the role of systematic and random motions with respect to virial equilibrium configurations; (iii) extent to which(More)
Analytical and geometrical properties of generalized power-law (GPL) density profiles are reviewed, and special effort is devoted to the special cases where GPL density profiles reduce to (i) a double power-law (DPL), and (ii) a single power-law (SPL). Then GPL density profiles are compared with simulated dark haloes (SDH) density profiles, and nonlinear(More)
Two-component, ideal, self-gravitating fluids are conceived as macro-gases, and the related equation of state is expressed using the virial theorem for subsystems, under the restriction of homeoidally striated density profiles. Explicit calculations are performed for a useful reference case and a few cases of astrophysical interest, both with and without(More)