## Wednesday, December 10, 2014

### Eddington-limit for muons

the Eddington-limit is defined as the luminosity where gravity is balanced by radiation pressure. imagine now that an astrophysical object contains muons instead of electrons: would the Eddington-limit be higher or lower?

#### 1 comment:

1. the cross section for elastic collisions between photons and electrons at low energies is the Thomson-cross section $\sigma_T$, which is proportional to $e^4/m_e^2$. replacing the electron mass by the muon mass gives a new cross section which is $4\times10^4$ times smaller, and therefore the Eddington-limit for muons would be larger by this factor.