We can now also consider the dilation described above to be a valid choice of f, if we let g(x)=1/8. The total mapping doesn't preserve density as we required in our simple model of Newtonian mechanics, but now we have a mapping which can be used to describe a gas whose container has expanded in volume by a factor of 2 in all dimensions. (This transformation is still forbidden if we set g(x)=1, which corresponds to the matter-creating transformation which was forbidden in the structured-Newtonian regime.)
It's worth noting that the rotation and translation maps from the Newtonian regime cannot have a decrease in density everywhere in the matter-preservation model: that is, we can't have g(x)<1>
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Sunday, May 2, 2010
On density variation
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Science
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