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Absolute units, or natural units, are a system of units where certain dimensionful constants are set to 1. This often simplifies various formulae.
5
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Why do people say that the string length is on the order of the Planck length?
As I understand it, string theory has only one fundamental dimensionful quantity - the string tension $T = 1/2 \pi \alpha'$, where $\alpha'$ is the Regge slope (in units where $c$ and $\hbar$ equal $1 …
17
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Do the Planck voltage and the Planck current have a natural physical interpretation in class...
Most Planck units are a product of powers of all three of $\hbar$, $c$, and $G$, so we will not be able to fully understand their physical significance until we have a full theory of quantum gravity. …