Search Publications
Constraints on primordial magnetic fields from Planck data combined with the South Pole Telescope CMB B -mode polarization measurements
Li, Yun; Pogosian, Levon; Zucca, Alex
A primordial magnetic field (PMF) present before recombination can leave specific signatures on the cosmic microwave background (CMB) fluctuations. Of particular importance is its contribution to the B-mode polarization power spectrum. Indeed, vortical modes sourced by the PMF can dominate the B-mode power spectrum on small scales, as they survive…
Bose-Einstein-condensed scalar field dark matter and the gravitational wave background from inflation: New cosmological constraints and its detectability by LIGO
Shapiro, Paul R.; Li, Bohua; Rindler-Daller, Tanja
We consider an alternative to weakly interacting massive particle (WIMP) cold dark matter (CDM)—ultralight bosonic dark matter (m ≳10-22 eV /c2) described by a complex scalar field (SFDM) with a global U (1 ) symmetry—for which the comoving particle number density or charge density is conserved after particle production durin…
Partially acoustic dark matter cosmology and cosmological constraints
Raveri, Marco; Hu, Wayne; Hoffman, Timothy +1 more
Observations of the cosmic microwave background (CMB) together with weak lensing measurements of the clustering of large scale cosmological structures and local measurements of the Hubble constant pose a challenge to the standard Λ CDM cosmological model. On one side CMB observations imply a Hubble constant that is lower than local measurements an…
Hybrid loop quantum cosmology and predictions for the cosmic microwave background
Castelló Gomar, Laura; Mena Marugán, Guillermo A.; Martín de Blas, Daniel +1 more
We investigate the consequences of the hybrid quantization approach for primordial perturbations in loop quantum cosmology, obtaining predictions for the cosmic microwave background and comparing them with data collected by the Planck mission. In this work, we complete previous studies about the scalar perturbations and incorporate tensor modes. W…
BICEP2 / Keck Array IX: New bounds on anisotropies of CMB polarization rotation and implications for axionlike particles and primordial magnetic fields
Ade, P. A. R.; Bock, J. J.; Crill, B. P. +64 more
We present the strongest constraints to date on anisotropies of cosmic microwave background (CMB) polarization rotation derived from 150 GHz data taken by the BICEP2 & Keck Array CMB experiments up to and including the 2014 observing season (BK14). The definition of the polarization angle in BK14 maps has gone through self-calibration in which…
LISA pathfinder appreciably constrains collapse models
Slagmolen, B. J. J.; Helou, Bassam; McClelland, David E. +1 more
Spontaneous collapse models are phenomological theories formulated to address major difficulties in macroscopic quantum mechanics. We place significant bounds on the parameters of the leading collapse models, the continuous spontaneous localization (CSL) model, and the Diosi-Penrose (DP) model, by using LISA Pathfinder's measurement, at a record a…
Conjoined constraints on modified gravity from the expansion history and cosmic growth
Nesseris, Savvas; Basilakos, Spyros
In this paper we present conjoined constraints on several cosmological models from the expansion history H (z ) and cosmic growth f σ8. The models we study include the CPL w0wa parametrization, the holographic dark energy (HDE) model, the time-varying vacuum (ΛtCDM ) model, the Dvali, Gabadadze and Porra…
Complete reionization constraints from Planck 2015 polarization
Heinrich, Chen He; Miranda, Vinicius; Hu, Wayne
We conduct an analysis of the Planck 2015 data that is complete in reionization observables from the large angle polarization E -mode spectrum in the redshift range 6 <z <30 . Based on 5 principal components, all of which are constrained by the data, this single analysis can be used to infer constraints on any model for reionization in the s…
Cosmological parameters from pre-Planck CMB measurements: A 2017 update
Bond, J. Richard; Devlin, Mark J.; Dunkley, Joanna +15 more
We present cosmological constraints from the combination of the full mission nine-year WMAP release and small-scale temperature data from the pre-Planck Atacama Cosmology Telescope (ACT) and South Pole Telescope (SPT) generation of instruments. This is an update of the analysis presented in Calabrese et al. [Phys. Rev. D 87, 103012 (2013), 10.1103…
Planck data versus large scale structure: Methods to quantify discordance
Battye, Richard A.; Moss, Adam; Charnock, Tom
Discordance in the Λ cold dark matter cosmological model can be seen by comparing parameters constrained by cosmic microwave background (CMB) measurements to those inferred by probes of large scale structure. Recent improvements in observations, including final data releases from both Planck and SDSS-III BOSS, as well as improved astrophysical unc…