MG15 - Talk detail

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We perform a forecast analysis to test the capacity of future baryon acoustic oscillation (BAO) and cosmic microwave background (CMB) experiments to constrain phenomenological interacting dark energy models using the Fisher matrix formalism. We consider a Euclid-like experiment to constrain the cosmological parameters of alternative cosmological models. Moreover, additional experimental probes can more efficiently provide information on the parameters forecast, justifying also the inclusion in the analysis of a future ground-based CMB experiment mainly designed to measure the polarization signal with high precision. In the interacting dark energy scenario, a coupling between dark matter and dark energy modifies the conservation equations such that the fluid equations for both constituents are conserved as the total energy density of the dark sector. In this context, we consider three phenomenological models which have been deeply investigated in literature over the past years. We find that the combination of both CMB and BAO information can break degeneracies among the dark sector parameters for all three models, although to different extents. We found powerful constraints on, for example, the coupling constant when comparing it with present limits for two of the models, and their future statistical 3-σ bounds could potentially exclude the null interaction for the combination of probes that is considered.

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One of the main goals of modern cosmology is to probe inflationary theories by looking on the imprint of primordial gravitational waves in the cosmic microwave background (CMB) polarization field. Future CMB experiments face the great challenge to search for this primordial B-mode signal. The CMB sky is however also filled with secondary B-modes, including CMB lensing and astrophysical foregrounds. Extracting the CMB B-mode polarization from astrophysical contaminations is a primordial task towards detection of the primordial signal. First of all, we must account for the Galactic emission that must be excluded from the data, which leads to an extra contamination in the form of a leakage between E-modes and B-modes. We use the analytical method of blind separation (ABS) proposed by Zhang, P., et al. (2017) to reconstruct the CMB B-mode power spectrum in the presence of foregrounds and white noise considering a partial sky analysis.

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