Search Publications
Probing features in inflaton potential and reionization history with future CMB space observations
Ballardini, Mario; Finelli, Fabio; Paoletti, Daniela +4 more
We consider the prospects of probing features in the primordial power spectrum with future Cosmic Microwave Background (CMB) polarization measurements. In the scope of the inflationary scenario, such features in the spectrum can be produced by local non-smooth pieces in an inflaton potential (smooth and quasi-flat in general) which in turn may ori…
Exploring cosmic origins with CORE: Extragalactic sources in cosmic microwave background maps
Boulanger, F.; Ashdown, M.; Banday, A. J. +124 more
We discuss the potential of a next generation space-borne Cosmic Microwave Background (CMB) experiment for studies of extragalactic sources. Our analysis has particular bearing on the definition of the future space project, CORE, that has been submitted in response to ESA's call for a Medium-size mission opportunity as the successor of the Planck …
Exploring cosmic origins with CORE: Effects of observer peculiar motion
Boulanger, F.; Ashdown, M.; Banday, A. J. +117 more
We discuss the effects on the cosmic microwave background (CMB), cosmic infrared background (CIB), and thermal Sunyaev-Zeldovich effect due to the peculiar motion of an observer with respect to the CMB rest frame, which induces boosting effects. After a brief review of the current observational and theoretical status, we investigate the scientific…
Exploring cosmic origins with CORE: Cluster science
Boulanger, F.; Ashdown, M.; Banday, A. J. +118 more
We examine the cosmological constraints that can be achieved with a galaxy cluster survey with the future CORE space mission. Using realistic simulations of the millimeter sky, produced with the latest version of the Planck Sky Model, we characterize the CORE cluster catalogues as a function of the main mission performance parameters. We pay parti…
CMB constraints on β-exponential inflationary models
Alcaniz, J. S.; Silva, R.; Benetti, M. +2 more
We analyze a class of generalized inflationary models proposed in ref. [1], known as β-exponential inflation. We show that this kind of potential can arise in the context of brane cosmology, where the field describing the size of the extra-dimension is interpreted as the inflaton. We discuss the observational viability of this class of model in li…
A Bayesian analysis of inflationary primordial spectrum models using Planck data
Benetti, Micol; Alcaniz, Jailson; Santos da Costa, Simony
The current available Cosmic Microwave Background (CMB) data show an anomalously low value of the CMB temperature fluctuations at large angular scales (l < 40). This lack of power is not explained by the minimal ΛCDM model, and one of the possible mechanisms explored in the literature to address this problem is the presence of features in the p…
CMB constraints on running non-Gaussianity
Bartolo, N.; Liguori, M.; Renzi, A. +2 more
We develop a complete set of tools for CMB forecasting, simulation and estimation of primordial running bispectra, arising from a variety of curvaton and single-field (DBI) models of Inflation. We validate our pipeline using mock CMB running non-Gaussianity realizations and test it on real data by obtaining experimental constraints on the fNL…
Constraints on brane-world inflation from the CMB power spectrum: revisited
Gangopadhyay, Mayukh R.; Mathews, Grant J.
We analyze the Randal Sundrum brane-world inflation scenario in the context of the latest CMB constraints from Planck. We summarize constraints on the most popular classes of models and explore some more realistic inflaton effective potentials. The constraint on standard inflationary parameters changes in the brane-world scenario. We confirm that …
The PAU Survey: a forward modeling approach for narrow-band imaging
Tortorelli, Luca; Della Bruna, Lorenza; Herbel, Jörg +18 more
Weak gravitational lensing is a powerful probe of the dark sector, once measurement systematic errors can be controlled. In [1], a calibration method based on forward modeling, called MCCL, was proposed. This relies on fast image simulations (e.g., UFig [2,3]}) that capture the key features of galaxy populations and measurement effects. The MCCL a…
Bias of damped Lyman-α systems from their cross-correlation with CMB lensing
Font-Ribera, A.; Slosar, A.; Alonso, D. +1 more
We cross-correlate the positions of damped Lyman-α systems (DLAs) and their parent quasar catalog with a convergence map derived from the Planck cosmic microwave background (CMB) temperature data. We make consistent measurements of the lensing signal of both samples in both Fourier and configuration space. By interpreting the excess signal present…