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Rydberg energy and Hubble constant
Although they are of different dimensions, the value of the Rydberg energy is very close to that of the Hubble constant.
Rydberg energy (R): $2.179 \times 10^{-18}$ [Joule] = 13.6 [eV]
Hubble ...
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What are $δ$ and $ε$ in the list of Dirac's five 'fundamental constants', concerning his 'Large number hypothesis'?
From Jean-Philippe Uzan's Varying Constants, Gravitation and Cosmology:
Dirac formed five dimensionless ratios among which1 δ ≡ H0ħ/mpc2 ∼ 2h × 10−42 and equation M1 and asked the question of which of ...
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Are physical constants determined by their observation?
In common interpretations of quantum mechanics, it can only be said that objects exist once I observe them - it is not legitimate to ask where an object was before I observed it.
Does this point of ...
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Was Planck's constant $h$ the same when the Big Bang happened as it is today?
Was Planck's constant $h$ the same when the Big Bang happened as it is today?
Planck's constant :
$$h= 6.626068 × 10^{-34}\, m^2 kg / s,$$
$$E=n.h.\nu,$$
$$\epsilon=h.\nu$$
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