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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> Obviously; I just wanted to establish relations in some limit cases,
> such as hexagonal dense packing -- to see how much it p-wave
> over/underestimates what GSTS gives. P-wave critical timestep is, from
> what I gathered, routinely used in continuum dynamics, and for people
> with that background, it would be nice to show the correspondence.
>
>   
Ok. Defining P-wave implies defining the macroscopic Young modulus of 
the packing, right?
You can make the comparison with the example I mentionned before : cubic 
packing (E=E*).
In that case you can define PWave velocity and particles eigen 
frequencies simply. My guess is that both methods will give the exact 
same result in that case.

Bruno