Bispectrum results
Assume local nonlinear bias: dg = b1 dm + b2 (dm)2
Nonlinear bias can mimic some aspects of gravitational evolution (e.g. skewness) - but full bispectrum contains shape information: bias doesn’t form filaments
Results for NGP + SGP: b1 = 1.04 ? 0.11, b2 = -0.05 ? 0.08 (for L=1.9L*)
+ b result ? Wm = 0.27 ? 0.06 - entirely internal to 2dFGRS
data match unbiased predictions