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Exploring the systematic uncertainties of SNe Ia

Exploring the systematic uncertainties of SNe Ia. Shuang Wang Northeastern University. Outline. 1. Introduction 2. Previous Works 3. Current Works 4. Summary. Introduction. Three Approaches to Explain Cosmic Accleration. Einstein equation. Modified Gravity. Dark Energy.

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Exploring the systematic uncertainties of SNe Ia

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  1. Exploring the systematic uncertainties of SNe Ia Shuang Wang Northeastern University

  2. Outline • 1. Introduction • 2. Previous Works • 3. Current Works • 4. Summary

  3. Introduction

  4. Three Approaches to Explain Cosmic Accleration Einstein equation Modified Gravity Dark Energy Friedmann–Lemaitre–Robertson–Walker metric Inhomogeneous Universe Friedmann equations SCDM model is disfavored by observations!

  5. Albrecht, et al., ''Report of the Dark Energy Task Force'', • arXiv:astro-ph/0609591 • Albrecht, et al., ''Report of the Dark Energy Task Force'', • arXiv:astro-ph/0609591 SNe Ia BAO WL GC

  6. systematic uncertainties of SNe Ia • errors in photometry, calibration and identification of SNe Ia • host-galaxy extinction • gravitational lensing • intrinsic variation of physical properties of SNe Ia

  7. Supernova Training (Using all SNe) Lightcurve fitter model Chi^2 Statistics cosmology Information (μ, α, β) Light-curve Fitting For one SN

  8. Light-curve Fitting • 1) rest-frame model mags + k-corrections: Mlcs2k2 (Jha,Riess,Kirshner ApJ 659 122 2007) • 2) rest-frame spectral model: SALT2 (Guy et. al., A&A 466,11,2007) stretch-luminosity parameter color-luminosity parameter

  9. ApJS 192, 1 (2011) A. Conley et. al. Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey

  10. The possible evolution of α and β • For the Pan-STARRS1 data Scolnic et. al., arXiv:1310.3824 • For the Union2.1 data Mohlabeng and Ralston, MNRAS 439, L16 (2014)

  11. Previous Works Shuang Wang, and Yun Wang Exploring the Systematic Uncertainties of Type Ia Supernovae as Cosmological Probes Phys. Rev. D 88, 043511 (2013) For the SNLS3 data

  12. Phys. Rev. D 89, 063524 (2014) Current Works Shuang Wang, Yun-He Li, and Xin Zhang Exploring the evolution of color-luminosity parameter β and its effects on parameter estimation ΛCDM model, wCDM model, CPL model

  13. SNe only cases

  14. SNe+CMB+GC cases

  15. Shuang Wang, Jia-Jia Geng, Yi-Liang Hu, and Xin Zhang Revisit of SNLS3 constraints on holographic dark energy: the effects of varying β and different light-curve fitters arXiv:1312.0184

  16. For all the models, adding a parameter of β can reduce the best-fit values of chi^2 by 36 β deviates from a constant at 6σ CL A time-varying β has significant effect on parameter estimation Considering the evolution of β is very helpful for reducing the tension between supernova and other observations Open questions: other systematic uncertainties? How to deal with them? Summary

  17. Thank You

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