Slides from the talk - CP3-Origins
Slides from the talk - CP3-Origins
Slides from the talk - CP3-Origins
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Models of primordial non-Gaussianity<br />
Local non-Gaussianity:<br />
A quadratic correction to <strong>the</strong> initial curvature perturbations, Φ:<br />
Φ(x) =φ(x)+f NL φ 2 (x)<br />
leading to <strong>the</strong> initial, curvature bispectrum<br />
B Φ (k 1 ,k 2 ,k 3 )=2f NL P φ (k 1 )P φ (k 2 )+2perm.<br />
with specific properties:<br />
• large values for squeezed triangular configurations<br />
• well represents <strong>the</strong>oretical models where perturbations are<br />
generated outside <strong>the</strong> horizon: curvaton, multiple-field<br />
inflation, inhomogeneous preheating, ....<br />
Equilateral non-Gaussianity:<br />
k 1<br />
k 2<br />
<br />
<br />
B Φ (k 1 ,k 2 ,k 3 )=6f NL −P φ (k 1 )P φ (k 2 )+perm. − 2P 2/3<br />
φ (k 1)P 2/3<br />
φ (k 2)P 2/3<br />
φ (k 3)+...<br />
k 3<br />
• large values for equilateral triangular configurations<br />
• well approximates <strong>the</strong> bispectrum predicted by DBI inflation<br />
or higher derivative models<br />
Orthogonal non-Gaussianity ... and many more<br />
k 1 k 2<br />
k 3
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