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f NL<br />
B R f NL<br />
・・・nonlinear estimator of primordial scalar non-Gaussianity (NG) <br />
R(k 1 )R(k 2 )R(k 3 )⇥ = (2⇥) 3 (3) (k 1 + k 2 + k 3 )B R (k 1 ,k 2 ,k 3 )<br />
Deviation from <strong>the</strong> Gaussian distribution <br />
Equilateral <br />
Local <br />
k 1 k 2<br />
Observations <br />
WMAP <br />
f equil<br />
NL<br />
= 51 ± 272<br />
Planck <br />
k 1 k 2<br />
k 3 k 3<br />
f equil<br />
NL<br />
= 42 ± 75<br />
Theory <br />
Standard slow-‐roll inflation <br />
L = X V ( )<br />
Observations <br />
Theory <br />
WMAP <br />
f local<br />
NL = 37 ± 40<br />
Planck <br />
f local<br />
NL =2.7 ± 5.8