  We have worked for some time on a model for dark matter, in which dark matter
consists of small bubbles of a new speculated type of vacuum, which are pumped
up by some ordinary matter such as diamond, so as to resist the pressure of the
domain wall separating the two vacua. Here we put forward thoughts on, how such
macroscopic pearls would have their surrounding dust cleaned off passing
through the atmosphere and the Earth, and what their distribution would be as a
function of the depth of their stopping point and the distribution of the
radiation emitted from them. In our model we assume that they radiate 3.5 keV
electrons and photons, after having been excited during their passage into the
Earth. The purpose of such an estimation of the radiation distribution is to
explain the truly mysterious fact that, among all the underground experiments
seeking dark matter colliding with the Earth material, only the DAMA-LIBRA
experiment has seen any evidence of dark matter. This is an experiment based on
solid NaI scintillators and is rather deep at 1400 m. It is our point that we
can arrange the main radiation to appear in the relatively deep DAMA- LIBRA
site, and explain that the dark matter pearls cannot stop in a fluid, such as
xenon in the xenon based experiments.
