Newtonian Particles are Dense
 Tampan, Paminggir people. Lampung region of Sumatra, circa 1900, 36 x 38 cm. Photograph by D Dunlop.

Let P be a material particle in fairly stable equilibrium with its environment. That is; consider that P might be emitting or absorbing lots of photons, but probably not breaking into pieces, or decaying beyond recognition. Then we can presumably model P as a sequence of excited states described by their density $\varrho$. Recall that the constant number $k_{\sf{F}}$ was introduced earlier. Definition: if P is dense enough so that

$k_{\sf{F}} \ll \varrho$

then we say P is a Newtonian particle. This density implies that Newtonian particles always have some special mechanical character like being heavy and slow, as discussed below and in the following articles.

$m c^{2} \simeq \left| \, H \, \right|$

$W^{2} \ll H ^{2}$

 Next step: momentum.
page revision: 731, last edited: 06 Mar 2016 19:24