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

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

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

Right.png Next step: momentum.
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