# BTTfixedeffort

Here we look at the constraints on the BTT three-point function with S4. For more on the BTT three-point function see http://lanl.arxiv.org/abs/1603.02243 (paper) http://lanl.arxiv.org/abs/1605.04431 (shorter conference proceedings)

These forecasts are with

-$\ell_{\rm min}^{T,B} = 30$

-Fixed effort with $f_{\rm sky} = 0.4$ corresponding to noise of 1 uK-arcmin

-No cosmic variance in B

Main conclusion; since B noise is the limiting factor in this correlation (and not T), $f_{\rm sky}$ roughly cancels. Only for very small sky fraction, there seems to be some effect. The conclusion should not hold when we detect r at some level (e.g. 0.01). I can make plots for that as well.

## $f^{h\zeta\zeta}_{\rm NL}$ Equilateral

For equilateral NGs in BTT the beam effect is small, however the sky fraction effect is even smaller.