1. Primordial Non-Gaussianity From Inflation
黄庆国
21世纪第二个十年宇宙学研讨会
中国科学院理论物理研究所

2. MAP
Seeded by
Quantum fluctuations

3. Curvature perturbation
time
General Relativity

4. Power spectrum
WMAP7:

5. Bispectrum (Non-Gaussianity)
strength
shape

6. f_NL
interaction

7. Local shape WMAP7: NVSS: PLANCK:
(Xia, Bonaldi, Baccigalupi, Zotti, Matarrese, Verde, Viel, 2010)
PLANCK:
Local shape

8. WMAP7:
Non-local shape

9. General Single-field inflation
Chen, Huang, Kachru, Shiu, 2006

10. General Single-field inflation
Stability of field theory:
General Single-field inflation
QGH, JCAP 05(2010)016

11. Single-field inflation
Single-field inflation CANNOT generate
large local form non-Gaussianity.
all single-field inflation models
Single-field inflation

12. A multiplicity of scalar fields is generally expected in the fundamental theories going beyond standard model, such as supersymmetric theory.
Multi fields

13. Multi-field inflation
Trajectory is tangent to the gradient of equipotential hypersurface.
Perturbation along the trajectory affects the value of the energy density.
Perturbation transverse to the trajectory only perturbes the field values, but not the energy density.
Multi-field inflation

14. End of inflation
QGH, JCAP 06(2009)035

15. From quantum fluctuations of fields
to the observed density perturbations
Reheating
Reheating
dependens on the dynamics of inflation

16. NG generated at the end of multi-field inflation
perturbed trajectory C
classical trajectory
NG generated at the end of multi-field inflation
QGH, JCAP 06(2009)035

17. NG generated at the end of multi-field inflation
perturbed trajectory C
classical trajectory
NG generated at the end of multi-field inflation
QGH, JCAP 06(2009)035

18. NG generated at the end of multi-field inflation
perturbed trajectory
classical trajectory C
NG generated at the end of multi-field inflation
QGH, JCAP 06(2009)035

19. NG generated at the end of multi-field inflation
convex
flat
concave
NG generated at the end of multi-field inflation
QGH, JCAP 06(2009)035

20. NG generated at the end of multi-field inflation
trajectory of inflaton
loc.
Local shape
non-Gaussianity C S
NG generated at the end of multi-field inflation
QGH, JCAP 06(2009)035

21. The next step.

22. Scale dependence of f_NL^local
CMB
Large-scale structure

23. Hoyle, Jimenez, Verde, 2010

24. Byrnes, Gerstenlauer, Nurmi, Tasinato, Wands, 2010 QGH, 2010
The spectral index and its running of f_NL^local from an isocurvature field:
Byrnes, Gerstenlauer, Nurmi, Tasinato, Wands, 2010
QGH, 2010

25. Sefusatti, Liguori, Yadav, Jackson, Pajer, JCAP 12(2009)022

26. QGH, JCAP 11(2010)026

27. Axion-type curvaton:
QGH, JCAP 11(2010)026

28. 2012

29. 世界末日？？？

30. 新的开始！

31. Let’s wait…