Expansion of Space and Atomic Size
If space is expanding (due to a time dependant metric),
then presumably the space inside of an atom is also expanding? Also,
what is the effect of the expansion of time?
While "space" is expanding on a cosmic scale, the effect on the atomic
scale is far too small to be observable I would estimate. In addition,
even the hydrogen atom, the simplest of all atoms, has many "minor"
corrections due to various quantum effects that isolating the effect
of the expansion of the Universe would be "swamped" by much larger
"small" effects. And of course there is that pesky Heisenberg
Uncertainty Principle to be accounted for.
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Update: June 2012