Search Publications
Uncertainties in direct dark matter detection in light of Gaia's escape velocity measurements
Valluri, Monica; Freese, Katherine; Wu, Youjia +2 more
Direct detection experiments have set increasingly stringent limits on the cross section for spin-independent dark matter-nucleon interactions. In obtaining such limits, experiments primarily assume the standard halo model (SHM) as the distribution of dark matter in our Milky Way. Three astrophysical parameters are required to define the SHM: the …
Detecting dark photon dark matter with Gaia-like astrometry observations
Yuan, Qiang; Zhao, Yue; Guo, Huai-Ke +3 more
A class of dark photon dark matter models with ultralight masses would lead to oscillation of a test body through a coupling with baryons or B-L charge. This periodical oscillation of an observer results in swing of a star's apparent position due to the effect of aberration of light, which could be probed with high-precision astrometry observation…
Impact of substructure on local dark matter searches
Ibarra, Alejandro; Kavanagh, Bradley J.; Rappelt, Andreas
Dark matter substructure can contribute significantly to local dark matter searches and may provide a large uncertainty in the interpretation of those experiments. For direct detection experiments, sub-halos give rise to an additional dark matter component on top of the smooth dark matter distribution of the host halo. In the case of dark matter c…
All-sky angular power spectra from cleaned WISE×SuperCOSMOS galaxy number counts
Balaguera-Antolínez, A.; Costa-Duarte, M. V.; Xavier, H. S. +1 more
Aiming to extract cosmological information from linear scales of the WISE×SuperCOSMOS photometric redshift catalog, we perform a characterization of the systematic effects associated with stellar content, evidencing the presence of contamination and obscuration. We create an integrated model for these effects (which together we call "usurper conta…
Resonant assisted annihilation
Nath Maity, Tarak; Sankar Ray, Tirtha
Assisted annihilation is a novel mechanism to generate viable sub-GeV thermal dark matter, where a pair of stable dark matter annihilates with an assister to Standard Model states. Typically such 3 → 2 annihilation topologies are flux suppressed compared to 2 → 2 processes. In this paper, we explore the possibility of a resonant 3 → 2 assisted ann…
Deflections of ultra-high energy cosmic rays by the Milky Way magnetic field: how well can they be corrected?
Pavlidou, V.; Magkos, G.
Locating the sources of ultra-high energy cosmic rays (UHECRs) still remains a difficult puzzle for modern astrophysics. A major hurdle in the search for the sources is the fact that UHECRs are deflected by the Galactic magnetic field (GMF). Current knowledge of the GMF is limited, as most experimental measurements track line-of-sight-integrated q…
QSOs sigposting cluster size halos as gravitational lenses: halo mass, projected mass density profile and concentration at z~0.7
Bonavera, L.; González-Nuevo, J.; Negrello, M. +6 more
Magnification bias is a gravitational lensing effect that is normally overlooked because it is considered sub-optimal in comparison with the lensing shear. Thanks to the demonstrated optimal characteristics of the sub-millimetre galaxies (SMGs) for lensing analysis, in this work we were able to measure the magnification bias produced by a sample o…
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…