Weak lensing predictions for coupled dark energy cosmologies at non-linear scales
| Autor: | Beynon, Emma, Baldi, Marco, Bacon, David J., Koyama, Kazuya, Sabiu, Cristiano |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Mon. Not. R. Astron. Soc. 422, 3546-3553 (2012) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1111/j.1365-2966.2012.20864.x |
| Popis: | We present non-linear weak lensing predictions for coupled dark energy models using the CoDECS simulations. We calculate the shear correlation function and error covariance expected for these models, for forthcoming ground-based (such as DES) and space-based (Euclid) weak lensing surveys. We obtain predictions for the discriminatory power of a ground-based survey similar to DES and a space-based survey such as Euclid in distinguishing between $\Lambda$CDM and coupled dark energy models; we show that using the non-linear lensing signal we could discriminate between $\Lambda$CDM and exponential constant coupling models with $\beta_0\geq0.1$ at $4\sigma$ confidence level with a DES-like survey, and $\beta_0\geq0.05$ at $5\sigma$ confidence level with Euclid. We also demonstrate that estimating the coupled dark energy models' non-linear power spectrum, using the $\Lambda$CDM Halofit fitting formula, results in biases in the shear correlation function that exceed the survey errors. Comment: 9 pages, 5 figures, v2: accepted for publication in MNRAS |
| Databáze: | arXiv |
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