function to calculate the integrand in an integral of a distribution over all momentum space. The integral is carried out in spherical coordinates. Therefore the distribution is here multiplied by p^2. Also note the input p must be of order 1 and is scaled in the function by distribution[["p_scale"]].

integrand_homogeneous_distribution(p, distribution)

Arguments

p

numeric length ofmomentum vector: p = norm(c(p_perp, p_par)). Of order 1.

distribution

list with the momentum distribution.

Value

numeric value of integrand at p