MG15 - Talk detail |
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Participant |
Benetti, Micol | |||||||
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Institution |
Federico II University - Via Cinthia, 21 - Napoli - Campania - Italy | |||||||
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Session |
AT1 |
Accepted |
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Time |
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Talk |
Oral abstract |
Title |
Observational constraints on Gauss-Bonnet cosmology | |||||
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Abstract |
In this talk I will show the study of a fully geometric approach to dark energy in the framework of F(R,G) theories of gravity, considering a class with power law solutions. We found that, depending on the value of the geometrical parameter, a shift in the anisotropy peaks position of the temperature power spectrum is produced, as well as an increasing in the matter power spectrum amplitude. We performed a MCMC analysis using both Cosmic Microwave Background (CMB) and Joint Light-Curve Analysis data, combined with the current local measurements of the Hubble value, H0, and galaxy data. I will show that such a model can describe the CMB data with slightly high H0 values, and the prediction on the amplitude matter spectrum value is proved to be in accordance with the observed matter distribution of the universe. At the same time, the value constrained for the geometric parameter implies a density evolution of such a components that is growing with time. |
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Pdf file |
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Session |
CM4 |
Accepted |
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Time |
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Talk |
Oral abstract |
Title |
Baryon Acoustic Oscillations measurements and the H0 tension | |||||
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Abstract |
In this talk I will investigate the role of two different samples of Baryon Acoustic Oscillations (BAO) on the cosmological analysis, the first obtained using two-point spatial correlation functions (BAO 2PCF) while the other using angular correlation functions (BAO 2PACF). We consider these measurements joined to the latest Cosmic Microwave Background Planck data, also in combination with Weak Lensing, thermal Sunyaev-Zeldovich counts and current local measurements of the Hubble value, H0, in order to better explore the H0 and the sigma8 tensions. In our work we test the standard model and some of its extensions, founding that BAO 2PCF always favor the standard scenario whereas the combinations using BAO 2PACF ever prefer the extended models. Furthermore, this latter constrain an higher H0 value, which alleviates the tension between the Planck 2015 CMB data and the HST value of H0. |
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Pdf file |
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