Observational tests of backreaction with recent data
- University of Milan, Physics Department, via Giovanni Celoria 16, Milan (Italy)
- Departamento de Física Teórica and Instituto de Física Teórica, Universidad Autónoma de Madrid IFT-UAM/CSIC, 28049 Cantoblanco, Madrid (Spain)
We explore the backreaction model based on the template metric proposed in Larena et al. [1] constraining the matter density parameter Ω{sub m}{sup D{sub 0}} and the Dark Energy parameter w with recent data. We provide constraints based on Supernovae Ia from the SNLS and the Union2.1 catalogs, confirming that the backreacted Universe should have a higher matter density than the corresponding Friedmaniann one. Angular diameter distances from clusters data confirm the same feature. Finally we combine these results with constraints obtained from the position of the first three peaks and the first dip of the CMB power spectrum, fitting WMAP-9 and Planck data. We find that an inconsistency arises in predicting the scale factor at recombination, leading to a backreacted Universe with lower matter density, in contradiction with results produced by SnIa and clusters. The same behavior is confirmed by analyzing the CMB-shift parameters from WMAP-9. We conclude exploring qualitatively the motivations of this inconsistency.
- OSTI ID:
- 22382057
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Planck constraints on holographic dark energy
Comparison of standard ruler and standard candle constraints on dark energy models