nLab speed of light (changes)

Showing changes from revision #4 to #5: Added | ~~Removed~~ | ~~Chan~~ged

Idea

~~Planck's constant~~

~~Compton wavelength~~

fundamental scales (fundamental/natural physical units)

speed of light $\,$ $c$
Planck's constant $\,$ $\hbar$
gravitational constant $\,$ $G_N = \kappa^2/8\pi$
Planck scale
- Planck length $\,$ $\ell_p = \sqrt{ \hbar G / c^3 }$
- Planck mass $\,$ $m_p = \sqrt{\hbar c / G}$
depending on a given mass $m$
- Compton wavelength $\,$ $\lambda_m = \hbar / m c$
- Schwarzschild radius $\,$ $2 m G / c^2$
- depending also on a given charge $e$
  - Schwinger limit $\,$ $E_{crit} = m^2 c^3 / e \hbar$
GUT scale
string scale
- string tension $\,$ $T = 1/(2\pi \alpha^\prime)$
- string length scale $\,$ $\ell_s = \sqrt{\alpha'}$
- string coupling constant $\,$ $g_s = e^\lambda$