formfactors: deal with oscillations at large q
Problems:
- MC for large particles is a very inaccurate and slow workaround
- GLS integration fails for some formfactors [Redmine1416]
Possible solutions [Gil, Segura, Temme ch 9.6.4]:
- Expand integrand in Legendre polynomials
- Expand integrand in Chebychev polynomials
- Filon integration
TODO:
- derive A(z)
- how to deal with imaginary part of q? require slicing (#219)?
- talk with numerics expert to choose among the possible solutions.
Edited by Wuttke, Joachim