Search Publications
Statistical imprints of CMB B-type polarization leakage in an incomplete sky survey analysis
Wang, Kai; Santos, Larissa; Zhao, Wen +2 more
One of the main goals of modern cosmology is to search for primordial gravitational waves by looking on their imprints in the B-type polarization in the cosmic microwave background radiation. However, this signal is contaminated by various sources, including cosmic weak lensing, foreground radiations, instrumental noises, as well as the E-to-B lea…
Sharp spectral features from light dark matter decay via gravity portals
Ibarra, Alejandro; Catà, Oscar; Ingenhütt, Sebastian
We investigate the phenomenology of dark matter decay assuming that it is induced by non-minimal coupling to gravity, when the dark matter mass is in the sub-GeV range, i.e. below the QCD confinement scale. We show that the decay of the singlet scalar dark matter candidate produces sharp features in the photon spectrum, in the form of lines, boxes…
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…