qspec.gamma_e  (  e ,  m  )[source]

The time-dilation/Lorentz factor $\gamma = E / (mc^2)$.

Parameters:

earray_like

The total energy $E$ of a body, including the energy of the rest mass (eV).

marray_like

The mass $m$ of the body (u).

Returns:

outndarray

The time-dilation/Lorentz factor $\gamma$ corresponding to the total energy e of a body with mass m.