Returns a MomentumArray whose elements are sampled from uniform distributions of energy and 3-momentum.

Parameters:¶

size : int¶

Number of elements.

max_energy : float¶

Upper bound for the energy of the momenta.

massless : float¶

Probability for any given momentum element to be massless. Default is 0.0.

seed : int, optional¶

Random number generator seed. Use the same seed for consistent results.

Returns:¶

Set of momenta, sampled uniformly in the energy component, and with uniform probability density over the surface of a 3-sphere for the spatial components.

Return type:¶

MomentumArray

Raises:¶

ValueError – If massless is not within the interval [0.0, 1.0].

Notes

Some ‘massless’ particles may have small, but finite masses. This is due to numerical errors associated with floating point calculations.