MG15 - Talk detail |
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Participant |
Shafieloo, Arman | |||||||
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Institution |
Korea Astronomy and Space Science Institute - 776 Dadeokdae-ro - Daejeon - Daejeon - South Korea | |||||||
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Session |
CM4 |
Accepted |
Yes |
Order |
4 |
Time |
17:15 | 25' + 5' |
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Talk |
Oral abstract |
Title |
Falsifying ΛCDM: Model-independent tests of the concordance model with eBOSS DR14Q and Pantheon | |||||
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Abstract |
Invited talk for the parallel session CM4: "Tensions on LCDM cosmological model and model-independent constraints" (co-chaired by Joan Solà and Luca Amendola) We combine model-independent reconstructions of the expansion history from the latest supernovae distance modulus compilation and measurements from baryon acoustic oscillation to test some important aspects of the concordance model of cosmology namely the FLRW metric and flatness of spatial curvature. We then use the reconstructed expansion histories to fit growth measurement from redshift-space distortion and obtain strong constraints on (Ωm,γ,σ8) in a model independent manner. Our results show consistency with a spatially flat FLRW Universe with general relativity to govern the perturbation in the structure formation and the cosmological constant as dark energy. However, we can also see some hints of tension among different observations within the context of the concordance model related to high redshift observations of the expansion history. This supports earlier findings of Sahni et al. (2014) & Zhao et al. (2017) and highlights the importance of precise measurement of expansion history and growth of structure at high redshifts. |
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Pdf file |
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Session |
DE1 |
Accepted |
Yes |
Order |
1 |
Time |
15:15 | 30' |
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Talk |
Oral abstract |
Title |
Reconstructing Dark Energy | |||||
| Coauthors | ||||||||
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Abstract |
Invited talk for the parallel session DE1: "Dark Energy and the Accelerating Universe" (co-chaired by Alexei Starobinsky and David Polarski) One of the main goals of physical cosmology is to reconstruct the expansion history of the universe and growth of structure to find the actual model of dark energy. In my talk I discuss about the challenges of understanding dark energy considering the data limitations and cosmographic degeneracies that makes it difficult to distinguish between dark energy models. I will also briefly discuss about prospects of understanding the properties of dark energy with near future observations. |
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Pdf file |
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