Search Publications
Cosmic microwave background limits on accreting primordial black holes
Kamionkowski, Marc; Ali-Haïmoud, Yacine
Interest in the idea that primordial black holes (PBHs) might comprise some or all of the dark matter has recently been rekindled following LIGO's first direct detection of a binary-black-hole merger. Here we revisit the effect of accreting PBHs on the cosmic microwave background (CMB) frequency spectrum and the angular temperature and polarizatio…
Can interacting dark energy solve the H0 tension?
Di Valentino, Eleonora; Melchiorri, Alessandro; Mena, Olga
The answer is yes. We indeed find that interacting dark energy can alleviate the current tension on the value of the Hubble constant H0 between the cosmic microwave background anisotropies constraints obtained from the Planck satellite and the recent direct measurements reported by Riess et al. 2016. The combination of these two data se…
Unveiling ν secrets with cosmological data: Neutrino masses and mass hierarchy
Ho, Shirley; Mena, Olga; Gerbino, Martina +4 more
Using some of the latest cosmological data sets publicly available, we derive the strongest bounds in the literature on the sum of the three active neutrino masses, Mν, within the assumption of a background flat Λ CDM cosmology. In the most conservative scheme, combining Planck cosmic microwave background temperature anisotropies and ba…
Global constraints on absolute neutrino masses and their ordering
Di Valentino, Eleonora; Melchiorri, Alessandro; Capozzi, Francesco +3 more
Within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, NO, or inverted, IO) are currently unknown. However, the combination of current data coming from oscillation experiments, neutrinoless double beta (0 ν β β ) decay searches, and cosmological surveys, can provide interesting constraints for…
CMB bounds on disk-accreting massive primordial black holes
Calore, Francesca; Kohri, Kazunori; Poulin, Vivian +2 more
Stellar-mass primordial black holes (PBH) have been recently reconsidered as a dark matter (DM) candidate after the aLIGO discovery of several binary black hole (BH) mergers with masses of tens of M⊙ . Matter accretion on such massive objects leads to the emission of high-energy photons, capable of altering the ionization and thermal hi…
General constraints on dark matter decay from the cosmic microwave background
Slatyer, Tracy R.; Wu, Chih-Liang
Precise measurements of the temperature and polarization anisotropies of the cosmic microwave background can be used to constrain the annihilation and decay of dark matter. In this work, we demonstrate via principal component analysis that the imprint of dark matter decay on the cosmic microwave background can be approximately parametrized by a si…
Echo of interactions in the dark sector
Nunes, Rafael C.; Kumar, Suresh
We investigate the observational constraints on an interacting vacuum energy scenario with two different neutrino schemes (with and without a sterile neutrino) using the most recent data from cosmic microwave background (CMB) temperature and polarization anisotropy, baryon acoustic oscillations (BAO), type Ia supernovae from JLA sample and structu…
Constraining dark energy dynamics in extended parameter space
Di Valentino, Eleonora; Melchiorri, Alessandro; Silk, Joseph +1 more
Dynamical dark energy has been recently suggested as a promising and physical way to solve the 3 sigma tension on the value of the Hubble constant H0 between the direct measurement of Riess et al. (2016) (R16, hereafter) and the indirect constraint from cosmic microwave anisotropies obtained by the Planck satellite under the assumption …
Two-season Atacama Cosmology Telescope polarimeter lensing power spectrum
Hasselfield, Matthew; Battaglia, Nicholas; Aiola, Simone +43 more
We report a measurement of the power spectrum of cosmic microwave background (CMB) lensing from two seasons of Atacama Cosmology Telescope polarimeter (ACTPol) CMB data. The CMB lensing power spectrum is extracted from both temperature and polarization data using quadratic estimators. We obtain results that are consistent with the expectation from…
Evidence for interacting dark energy from BOSS
Ferreira, Elisa G. M.; Quintin, Jerome; Costa, André A. +2 more
The result presented by the BOSS-SDSS Collaboration measuring the baryon acoustic oscillations of the Lyman-alpha forest from high-redshift quasars indicates a 2.5 σ departure from the standard Λ -cold-dark-matter model. This is the first time that the evolution of dark energy at high redshifts has been measured, and the current results cannot be …