1. Determination of cosmological parameters Gong-Bo Zhao, Jun-Qing Xia, Bo Feng, Hong Li Xinmin Zhang IHEP, Beijing 06.8.30

2. 2006.8.30 Beijing2nd Sino-French Workshop Universe encoded in Parameter space Dark energy perturbation ??

3. 2006.8.30 Beijing2nd Sino-French Workshop Dark energy perturbations when w crossing -1 Dark energy & Inflation Outline Global fitting results of dark energy parameters Dark energy & neutrino mass limit 1 2 3 4 Bump-like dark energy 5 Searching for CPT violation 6

4. 2006.8.30 Beijing2nd Sino-French Workshop Dark Energy: * Negative pressure:  * Smoothly distributed, (almost ) not clustering Candidates: * Cosmological constant (or vacuum Energy) cosmological constant problem! * Dynamical Field: Quintessence, K-essence, Phantom etc

5. 2006.8.30 Beijing2nd Sino-French Workshop

6. 2006.8.30 Beijing2nd Sino-French Workshop Feng, Wang & Zhang Astro-ph/0404224 Huterer & Cooray Astro-ph/0404062 z w

7. 2006.8.30 Beijing2nd Sino-French Workshop Implication in model building of dark energy If the running of w(Z), especially a transition across –1, confirmed in the future, big challenge to the model building * Vacuum : w=-1 * Quintessence: * Phantom: * K-essence: or but cannot across -1 (Vikman: astro-ph/0407107 ) A new scenanio of Dark Energy : Quintom (Zhang et al. Astro-ph/0404224) For ex: single scalar: multi-scalar:

8. 2006.8.30 Beijing2nd Sino-French Workshop Astro-ph/0407259, Steen Hannestad,Steen Hannestad Edvard Mortsell Adding CMB,LSS data

9. 2006.8.30 Beijing2nd Sino-French Workshop Include DE perturbation when parametrizing the EOS Seljak et al Astro-ph/0407372 Ch. Yeche et al Astro-ph/0507170 Neglect DE perturbations Including DE perturbation only when w>-1 BIASED!

10. 2006.8.30 Beijing2nd Sino-French Workshop Strategies to handle the fluctuation of Dark Energy Difficulty:

11. 2006.8.30 Beijing2nd Sino-French Workshop Perturbation of DE is continuous during crossing! Here δ and θ are the density perturbation and the divergence of the fluid velocity respectively Zhao et.al Phys.Rev.D 72,123515 A way out based on quintom model

12. 2006.8.30 Beijing2nd Sino-French Workshop Our strategy to handle perturbations when w crosses -1 I. Quintessence – like perturbation II. Phantom – like perturbation III. Quintom-based perturbation

13. 2006.8.30 Beijing2nd Sino-French Workshop Constrains on dark energy with SN Ia + SDSS + WMAP-1 Observing dark energy dynamics with supernova, microwave background and galaxy clustering Jun-Qing Xia, Gong-Bo Zhao, Bo Feng, Hong Li and Xinmin Zhang Phys.Rev.D73, 063521, 2006

14. 2006.8.30 Beijing2nd Sino-French Workshop Jun-Qing Xia, Gongbo Zhao, Bo Feng, Hong Li and Xinmin Zhang Phys.Rev.D73, 063521, 2006 WMAP+SDSS+Riess WMAP+SDSS+SNLS Comparision of global fitting results with SN Ia (Riess) and SNLS

15. 2006.8.30 Beijing2nd Sino-French Workshop Constrain on dark energy by WMAP (importance of perturbation) Relative error: ~9% Relative error > 50% !!

16. 2006.8.30 Beijing2nd Sino-French Workshop

17. 2006.8.30 Beijing2nd Sino-French Workshop Gong-Bo Zhao, Jun-Qing Xia, Bo Feng and Xinmin Zhang, astro-ph/0603621

18. 2006.8.30 Beijing2nd Sino-French Workshop

19. 2006.8.30 Beijing2nd Sino-French Workshop

20. 2006.8.30 Beijing2nd Sino-French Workshop

21. 2006.8.30 Beijing2nd Sino-French Workshop A short summary on dark energy Current data consistent with the cosmological constant Dynamical models not ruled out Data mildly favor the Quintom: a dynamical dark energy with equation of state evolving and crossing -1 Questions: How dynamical dark energy in the global fitting affects the parameters of inflation, neutrino mass … ? I. Interesting correlation between Inflation and dark energy parameters II.Interesting correlation between dynamical dark energy and neutrino mass

22. 2006.8.30 Beijing2nd Sino-French Workshop Dark energy & Inflation

23. 2006.8.30 Beijing2nd Sino-French Workshop WMAP3 + RIESS + SDSS (14 k-bands)

24. 2006.8.30 Beijing2nd Sino-French Workshop Neutrino mass limit and dynamics of dark energy Jun-Qing Xia, Gong-Bo Zhao, Bo Feng, Xinmin Zhang In preparation

25. 2006.8.30 Beijing2nd Sino-French Workshop

26. 2006.8.30 Beijing2nd Sino-French Workshop

27. 2006.8.30 Beijing2nd Sino-French Workshop

28. 2006.8.30 Beijing2nd Sino-French Workshop Bump-like dark energy

29. 2006.8.30 Beijing2nd Sino-French Workshop EoS with feature:

30. 2006.8.30 Beijing2nd Sino-French Workshop Probing this feature with GRB??

31. 2006.8.30 Beijing2nd Sino-French Workshop “Offline” analysis of the first 2 years - Search the previous year imaging data for likely SNe either missed or not spectred for various reasons - get z from host galaxy spectro (either by us or other projects) or get photo-z from imaging - photo-id the SN - add Ia to the Hubble diagram (in red) very preliminary Z=1.2 ! From Prof. Reynald Pain’s Hangzhou talk (May, 2006)

32. 2006.8.30 Beijing2nd Sino-French Workshop Precise Hubble diagram from SNe Ia From Dr. Xiao Feng Wang’s Hangzhou talk ( May, 2006)

33. 2006.8.30 Beijing2nd Sino-French Workshop Searching for CPT violation

34. 2006.8.30 Beijing2nd Sino-French Workshop predicting and Bo Feng, Mingzhe Li, Jun-Qing Xia, Xuelei Chen and Xinmin Zhang Phys. Rev. Lett. 96, 221302 (2006) (Note here the notation: G ~ E, C~ B)

35. 2006.8.30 Beijing2nd Sino-French Workshop Summary I. Quintom Dark Energy Models: Current data consistent with the cosmological constant but mildly favor the Quintom: a dynamical dark energy with Equation of state evolving and crossing -1 need more data and model building of Quintom dark energy II. Interesting correlation between ns, alphas & DE III. Interesting correlation between w1 neutrino mass IV. A model of Dark energy with featured EOS and its prediction (modulation) on Hubble diagrams V. Searching for Cosmological CPT Violation with new CMB data

36. 2006.8.30 Beijing2nd Sino-French Workshop