qspec.boost  (  x ,  v ,  axis = -1  )[source]

The relativistic Lorentz-boosted 4-vector $$ x^{\prime\mu} = \Lambda^\nu_\mu(\vec{v})x^\mu, $$ with the Lorentz-boost matrix $\Lambda_\nu^\mu$.

Parameters:

xarray_like

The 4-vector $x^\mu$ in the stationary rest frame (arb. units). Must have size 4 in the specified axis.

varray_like

The velocity 3-vector $\vec{v}$. Must have size 3 in the specified axis (m/s).

axisint

The axis along which the vector components are aligned.

Returns:

x_boostedndarray

The 4-vector $x^{\prime\mu}$ in the coordinate system moving with velocity v relative to the current rest frame ([x]).

Raises:

ValueError

x and v must have 4 and 3 components along the specified axis, respectively. The shapes of x and v must be compatible.