Boltzmann collision operator reduced from 8D to 5D via SO(3) integration and Wigner-Eckart factorization, decoupling geometry from scattering with exact invariants and large speedups.
direct determination by recursion
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Wigner-Eckart Factorization of the Spectral Boltzmann Collision Operator
Boltzmann collision operator reduced from 8D to 5D via SO(3) integration and Wigner-Eckart factorization, decoupling geometry from scattering with exact invariants and large speedups.