Roberto Caimmi

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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)
On the basis of earlier investigations on homeoidally striated Mac Laurin spheroids and Jacobi ellipsoids (Caimmi and Marmo 2005; Caimmi 2006a, 2007), different sequences of configurations are defined and represented on the ellipticity-rotation plane, (Oêχ 2 v). The rotation parameter, χ 2 v , is defined as the ratio, E rot /E res , of kinetic energy(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)
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)
Unsustained matter distributions unescapely collapse unless fragmentation and centrifugal or pressure support take place. Starting from the above evidence, supermassive compact objects at the centre of large-mass galaxies (defined as " holes ") are conceived as the end-product of the gravitational collapse of local density maxima (defined as " central(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)