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Results tagged with absolute-units
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user 27732
Absolute units, or natural units, are a system of units where certain dimensionful constants are set to 1. This often simplifies various formulae.
6
votes
How total mass of universe is calculated?
This is a cute observation, but is essentially just dimensional analysis. It follows from doing a rough order of magnitude estimate where you only keep track of the Hubble constant plus fundamental co …
- 55.3k
9
votes
Where does Planck's constant come from in non-renormalizability of quantum gravity?
One way to think about it is in terms of the path integral. For perturbative quantum gravity around flat space, we expand the metric as
$$
g_{\mu\nu} = \eta_{\mu\nu} + h_{\mu\nu}
$$
where $h_{\mu\nu}$ …
- 55.3k
2
votes
What happens to the $2\pi$ factor in natural units?
One physical interpretation of natural units is that we will use photons as measuring devices. We can measure all quantities in terms of the energy of a photon:
When we say the mass of a proton is ab …
- 55.3k
3
votes
Do the Planck voltage and the Planck current have a natural physical interpretation in class...
I don't think this question really has a unique answer, but my take is that the premise of the question is a little confused because of the use of Heaviside units.
I would actually find it more natura …
- 55.3k