Post-Limber Weak Lensing Bispectrum, Reduced Shear Correction, and Magnification Bias Correction

Understand

The significant increase in precision that will be achieved by Stage IV cosmic shear surveys means that several currently used theoretical approximations may cease to be valid.

• An additional layer of complexity arises from the fact that many of these approximations are interdependent; the procedure to correct for one involves making another.
• Two such approximations that must be relaxed for upcoming experiments are the reduced shear approximation and the effect of neglecting magnification bias.
• Accomplishing this involves the calculation of the convergence bispectrum; typically subject to the Limber approximation.