Search Publications
Hot axions and the H0 tension
Notari, Alessio; D'Eramo, Francesco; Ferreira, Ricardo Z. +1 more
Scattering and decay processes of thermal bath particles involving heavy leptons can dump hot axions in the primordial plasma around the QCD phase transition. We compute their relic density, parameterized by an effective number ΔNeff of additional neutrinos. For couplings allowed by current bounds, production via scattering yields ΔN
Structure formation in f(T) gravity and a solution for H0 tension
Nunes, Rafael C.
We investigate the evolution of scalar perturbations in f(T) teleparallel gravity and its effects on the cosmic microwave background (CMB) anisotropy. The f(T) gravity generalizes the teleparallel gravity which is formulated on the Weitzenböck spacetime, characterized by the vanishing curvature tensor (absolute parallelism) and the non-vanishing t…
Neutrino masses and their ordering: global data, priors and models
de Salas, P. F.; Gariazzo, S.; Archidiacono, M. +3 more
We present a full Bayesian analysis of the combination of current neutrino oscillation, neutrinoless double beta decay and Cosmic Microwave Background observations. Our major goal is to carefully investigate the possibility to single out one neutrino mass ordering, namely Normal Ordering or Inverted Ordering, with current data. Two possible parame…
Halometry from astrometry
Van Tilburg, Ken; Weiner, Neal; Taki, Anna-Maria
Halometry—mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo—can be realized via variable weak gravitational lensing of the apparent motions of stars and other luminous background sources. Modern astrometric surveys provide unprecedented positional precision along with a leap in the number of cata…
Exploring cosmic origins with CORE: B-mode component separation
Boulanger, F.; Ashdown, M.; Baccigalupi, C. +114 more
We demonstrate that, for the baseline design of the CORE satellite mission, the polarized foregrounds can be controlled at the level required to allow the detection of the primordial cosmic microwave background (CMB) B-mode polarization with the desired accuracy at both reionization and recombination scales, for tensor-to-scalar ratio values of rg…
Relieving the tension between weak lensing and cosmic microwave background with interacting dark matter and dark energy models
Feng, Chang; Wang, Bin; An, Rui
We constrain interacting dark matter and dark energy (IDMDE) models using a 450-degree-square cosmic shear data from the Kilo Degree Survey (KiDS) and the angular power spectra from Planck's latest cosmic microwave background measurements. We revisit the discordance problem in the standard Lambda cold dark matter (ΛCDM) model between weak lensing …
Constraining warm inflation with CMB data
Bhattacharya, Sukannya; Dutta, Koushik; Gangopadhyay, Mayukh Raj +1 more
We confront the warm inflation observational predictions directly with the latest CMB data. We focus on a linear temperature (T) dissipative coefficient combined with the simplest model of inflation, a quartic chaotic potential. Although excluded in its standard cold inflation version, dissipation reduces the tensor-to-scalar ratio and brings the …
Deconstructing the neutrino mass constraint from galaxy redshift surveys
Komatsu, Eiichiro; Boyle, Aoife
The total mass of neutrinos can be constrained in a number of ways using galaxy redshift surveys. Massive neutrinos modify the expansion rate of the Universe, which can be measured using baryon acoustic oscillations (BAOs) or the Alcock-Paczynski (AP) test. Massive neutrinos also change the structure growth rate and the amplitude of the matter pow…
Anatomy of Eddington-like inversion methods in the context of dark matter searches
Lacroix, Thomas; Stref, Martin; Lavalle, Julien
Irrespective of the dark matter (DM) candidate, several potentially observable signatures derive from the velocity distribution of DM in halos, in particular in the Milky Way (MW) halo. Examples include direct searches for weakly-interacting massive particles (WIMPs), p-wave suppressed or Sommerfeld-enhanced annihilation signals, microlensing even…
Exploring cosmic origins with CORE: Gravitational lensing of the CMB
Boulanger, F.; Ashdown, M.; Banday, A. J. +111 more
Lensing of the cosmic microwave background (CMB) is now a well-developed probe of the clustering of the large-scale mass distribution over a broad range of redshifts. By exploiting the non-Gaussian imprints of lensing in the polarization of the CMB, the CORE mission will allow production of a clean map of the lensing deflections over nearly the fu…