Search Publications
Local properties of the large-scale peaks of the CMB temperature
Martínez-González, E.; Vielva, P.; Marcos-Caballero, A.
In the present work, we study the largest structures of the CMB temperature measured by Planck in terms of the most prominent peaks on the sky, which, in particular, are located in the southern galactic hemisphere. Besides these large-scale features, the well-known Cold Spot anomaly is included in the analysis. All these peaks would contribute sig…
Measuring neutrino mass imprinted on the anisotropic galaxy clustering
Oh, Minji; Song, Yong-Seon
The anisotropic galaxy clustering of large scale structure observed by the Baryon Oscillation Spectroscopic Survey Data Release 11 is analyzed to probe the sum of neutrino masses in the small mν lesssim 1 eV limit in which the early broadband shape determined before the last scattering surface is immune from the variation of mν
Multiscale analysis of the CMB temperature derivatives
Martínez-González, E.; Vielva, P.; Marcos-Caballero, A.
We study the Planck CMB temperature at different scales through its derivatives up to second order, which allows one to characterize the local shape and isotropy of the field. The problem of having an incomplete sky in the calculation and statistical characterization of the derivatives is addressed in the paper. The analysis confirms the existence…
On the regularity of the covariance matrix of a discretized scalar field on the sphere
Barreiro, R. B.; Herranz, D.; Martínez-González, E. +2 more
We present a comprehensive study of the regularity of the covariance matrix of a discretized field on the sphere. In a particular situation, the rank of the matrix depends on the number of pixels, the number of spherical harmonics, the symmetries of the pixelization scheme and the presence of a mask. Taking into account the above mentioned compone…
The trouble with H0
Riess, Adam G.; Verde, Licia; Bernal, José Luis
We perform a comprehensive cosmological study of the H0 tension between the direct local measurement and the model-dependent value inferred from the Cosmic Microwave Background. With the recent measurement of H0 this tension has raised to more than 3 σ. We consider changes in the early time physics without modifying the late …
Lyman-alpha forests cool warm dark matter
Palanque-Delabrouille, Nathalie; Viel, Matteo; Yèche, Christophe +2 more
The free-streaming of keV-scale particles impacts structure growth on scales that are probed by the Lyman-alpha forest of distant quasars. Using an unprecedentedly large sample of medium-resolution QSO spectra from the ninth data release of SDSS, along with a state-of-the-art set of hydrodynamical simulations to model the Lyman-alpha forest in the…
Evidence for dark matter interactions in cosmological precision data?
Lesgourgues, Julien; Marques-Tavares, Gustavo; Schmaltz, Martin
We study a two-parameter extension of the cosmological standard model ΛCDM in which cold dark matter interacts with a new form of dark radiation. The two parameters correspond to the energy density in the dark radiation fluid ΔNfluid and the interaction strength between dark matter and dark radiation. The interactions give rise to a ver…
Robust forecasts on fundamental physics from the foreground-obscured, gravitationally-lensed CMB polarization
Peiris, Hiranya V.; Feeney, Stephen M.; Errard, Josquin +1 more
Recent results from the BICEP, Keck Array and Planck Collaborations demonstrate that Galactic foregrounds are an unavoidable obstacle in the search for evidence of inflationary gravitational waves in the cosmic microwave background (CMB) polarization. Beyond the foregrounds, the effect of lensing by intervening large-scale structure further obscur…
Constraints on deviations from ΛCDM within Horndeski gravity
Verde, Licia; Jimenez, Raul; Cuesta, Antonio J. +1 more
Recent anomalies found in cosmological datasets such as the low multipoles of the Cosmic Microwave Background or the low redshift amplitude and growth of clustering measured by e.g., abundance of galaxy clusters and redshift space distortions in galaxy surveys, have motivated explorations of models beyond standard ΛCDM. Of particular interest are …
The mass-sheet degeneracy and time-delay cosmography: analysis of the strong lens RXJ1131-1231
Amara, Adam; Refregier, Alexandre; Birrer, Simon
We present extended modelling of the strong lens system RXJ1131-1231 with archival data in two HST bands in combination with existing line-of-sight contribution and velocity dispersion estimates. Our focus is on source size and its influence on time-delay cosmography. We therefore examine the impact of mass-sheet degeneracy and especially the dege…