Squeeze-jammed grains
Þ
excess slow vibrations
NORMAL
SOLID
JAMMED
SOLID
acoustic
modes
?
:
:
::
simulated random packing
Why
constant
density of
modes?
––
Nagel, Liu, O
Õ
Hern 2003
TOO
MANY
Most compressed is 10^-2; least compressed is 10^-8