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Exploring Supernova and Quintom Models in Dark Energy Research

Delve into the parameters, perturbations, and implications of dark energy models such as Supernova and Quintom in the 7th Sino-German Workshop. Learn about candidates like Quintessence, Phantom, and K-essence proposed for solved cosmological mysteries. This workshop discusses constraining dark energy using observational data from CMB, LSS, and SN Ia, emphasizing the importance of understanding dark energy perturbations and dynamics. Explore the correlation between dark energy and inflation, neutrino mass limits, and the continuous probing of featured equations of state. Stay updated on the latest research in this evolving field of cosmology.

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Exploring Supernova and Quintom Models in Dark Energy Research

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  1. Supernova and Quintom Model of Dark Energy Gong-Bo Zhao, Jun-Qing Xia, Bo Feng, Hong Li Xinmin Zhang IHEP, Beijing06.9.25

  2. Parameter space Dark energy perturbation ?? Universe encoded in 7th Sino-German Workshop

  3. Outline 1 Dark energy perturbations when w crossing -1 2 Global fitting results of dark energy parameters 3 Dark energy & Inflation 4 Dark energy & neutrino mass limit 5 Bump-like dark energy 7th Sino-German Workshop

  4. 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 7th Sino-German Workshop

  5. 7th Sino-German Workshop

  6. Feng, Wang & Zhang Astro-ph/0404224 Huterer & Cooray Astro-ph/0404062 w z 7th Sino-German Workshop

  7. 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: 7th Sino-German Workshop

  8. Adding CMB,LSS data Astro-ph/0407259, Steen Hannestad, Edvard Mortsell 7th Sino-German Workshop

  9. Include DE perturbation when parametrizing the EOS Ch. Yeche et al Astro-ph/0507170 BIASED!! Including DE perturbation only when w>-1 Seljak et al Astro-ph/0407372 Neglect DE perturbations 7th Sino-German Workshop

  10. Strategies to handle the fluctuation of Dark Energy Difficulty: 7th Sino-German Workshop

  11. Here δ and θ are the density perturbation and the divergence of the fluid velocity respectively Perturbation of DE is continuous during crossing! Zhao et.al Phys.Rev.D 72,123515 7th Sino-German Workshop

  12. Our strategy to handle perturbations when w crosses -1 • Quintessence – like perturbation • Phantom – like perturbation • Quintom-based perturbation 7th Sino-German Workshop

  13. 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 7th Sino-German Workshop

  14. Comparision of global fitting results with SN Ia (Riess) and SNLS WMAP+SDSS+SNLS WMAP+SDSS+Riess Jun-Qing Xia, Gongbo Zhao, Bo Feng, Hong Li and Xinmin Zhang Phys.Rev.D73, 063521, 2006 7th Sino-German Workshop

  15. Relative error: ~9% Relative error > 50% !! Constrain on dark energy by WMAP (importance of perturbation) 7th Sino-German Workshop

  16. 7th Sino-German Workshop

  17. Gong-Bo Zhao, Jun-Qing Xia, Bo Feng and Xinmin Zhang, astro-ph/0603621 7th Sino-German Workshop

  18. 7th Sino-German Workshop

  19. 7th Sino-German Workshop

  20. 7th Sino-German Workshop

  21. 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 • Interesting correlation between dynamical dark energy and neutrino mass 7th Sino-German Workshop

  22. Dark energy & Inflation 7th Sino-German Workshop

  23. WMAP3 + RIESS + SDSS (14 k-bands) 7th Sino-German Workshop

  24. Neutrino mass limit and dynamics of dark energy Jun-Qing Xia, Gong-Bo Zhao and Xinmin Zhang 7th Sino-German Workshop

  25. 7th Sino-German Workshop

  26. 7th Sino-German Workshop

  27. 7th Sino-German Workshop

  28. Oscillating Quintom and the Recurrent Universe: astro-ph/0407432 Bo Feng, Minzhe Li, Yunsong Piao, Xinmin Zhang 7th Sino-German Workshop

  29. Dark energy with featured EOS 7th Sino-German Workshop

  30. Astro-ph / 0605366 Parameterization: 7th Sino-German Workshop

  31. 7th Sino-German Workshop

  32. 7th Sino-German Workshop

  33. EoS with feature: 7th Sino-German Workshop

  34. Probing this feature with GRB?? 7th Sino-German Workshop

  35. “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) 7th Sino-German Workshop

  36. Precise Hubble diagram from SNe IaFrom Dr. Xiao Feng Wang’s Hangzhou talk ( May, 2006) 7th Sino-German Workshop

  37. Summary • 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 • Interesting correlation between ns, alphas & DE • Interesting correlation between w1 neutrino mass • A model of Dark energy with featured EOS and its prediction (modulation) • on Hubble diagrams 7th Sino-German Workshop

  38. Thank You ! 7th Sino-German Workshop

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