We study the phenomenon of internal avalanching within the context of recently proposed “Tetris” lattice models for granular media. We consider a packing of particles subjected to two different dynamics. In the first case, we arrest the system at different instances during an “aging”...

The theory of ageing is at the center of this paper. We test the mutation accumulation theory by using the Penna model introducing higher death rates for selected parts of the population. The changes in the mutation accumulation curves obtained cannot be explained by a simple monotonic function,...

We discuss some properties of the phase occurring in between the connectivity percolation threshold and the rigidity one, for a randomly diluted lattice of springs. We introduce a domain of free extension, which separates the floppy regime from the elastic one in the dilution case. We mention,...