Search Publications
Constraining dark matter-baryon scattering with linear cosmology
Dvorkin, Cora; Blum, Kfir; Kamionkowski, Marc
We derive constraints on elastic scattering between baryons and dark matter using the cosmic microwave background (CMB) data from the Planck satellite and the Lyman-α forest data from the Sloan Digital Sky Survey. Elastic scattering allows baryons and dark matter to exchange momentum, affecting the dynamics of linear density perturbations in the e…
Current dark matter annihilation constraints from CMB and low-redshift data
Madhavacheril, Mathew S.; Sehgal, Neelima; Slatyer, Tracy R.
Updated constraints on the dark matter cross section and mass are presented combining cosmic microwave background (CMB) power spectrum measurements from Planck, WMAP9, ACT, and SPT as well as several low-redshift data sets (BAO, HST, and supernovae). For the CMB data sets, we combine WMAP9 temperature and polarization data for l ≤431 with Planck t…
Constraints on large-scale dark acoustic oscillations from cosmology
Cyr-Racine, Francis-Yan; de Putter, Roland; Raccanelli, Alvise +1 more
If all or a fraction of the dark matter (DM) were coupled to a bath of dark radiation (DR) in the early Universe, we expect the combined DM-DR system to give rise to acoustic oscillations of the dark matter until it decouples from the DR. Much like the standard baryon acoustic oscillations, these dark acoustic oscillations (DAO) imprint a characte…
Effective field theory of cosmic acceleration: Constraining dark energy with CMB data
Frusciante, Noemi; Hu, Bin; Raveri, Marco +1 more
We introduce EFTCAMB/EFTCosmoMC as publicly available patches to the commonly used camb/CosmoMC codes. We briefly describe the structure of the codes, their applicability and main features. To illustrate the use of these patches, we obtain constraints on parametrized pure effective field theory and designer f(R) models, both on ΛCDM and wCDM backg…
Constraints on 3.55 keV line emission from stacked observations of dwarf spheroidal galaxies
Eckert, D.; Malyshev, D.; Neronov, A.
Several recent works have reported the detection of an unidentified x-ray line at 3.55 keV, which could possibly be attributed to the decay of dark matter (DM) particles in the halos of galaxy clusters and in the M31 galaxy. We analyze all publicly available XMM-Newton satellite data of dwarf spheroidal galaxies to test the possible DM origin of t…
Testing the interaction between dark energy and dark matter with Planck data
Ferreira, Elisa G. M.; Costa, André A.; Abdalla, E. +2 more
Interacting dark energy and dark matter is used to go beyond the standard cosmology. We base our arguments on Planck data and conclude that an interaction is compatible with the observations and can provide a strong argument towards consistency of different values of cosmological parameters.
Cosmological constraints on very dark photons
Fradette, Anthony; Pospelov, Maxim; Pradler, Josef +1 more
We explore the cosmological consequences of kinetically mixed dark photons with a mass between 1 MeV and 10 GeV and an effective electromagnetic fine structure constant as small as 10-38. We calculate the freeze-in abundance of these dark photons in the early universe and explore the impact of late decays on big bang nucleosynthesis and…
BBN and the CMB constrain light, electromagnetically coupled WIMPs
Nollett, Kenneth M.; Steigman, Gary
In the presence of a light weakly interacting massive particle (WIMP; mχ≲30 MeV), there are degeneracies among the nature of the WIMP (fermion or boson), its couplings to the standard-model particles (electromagnetic or to neutrinos only), the WIMP mass mχ, and the number of equivalent neutrinos beyond the standard model ΔN
Neutrinos help reconcile Planck measurements with both the early and local Universe
Dvorkin, Cora; Hu, Wayne; Wyman, Mark +1 more
In light of the recent BICEP2 B-mode polarization detection, which implies a large inflationary tensor-to-scalar ratio r0.05=0.2-0.05+0.07, we re-examine the evidence for an extra sterile massive neutrino, originally invoked to account for the tension between the cosmic microwave background (CMB) temperature power spectrum and local mea…
Cosmological constraints on interacting dark energy with redshift-space distortion after Planck data
Yang, Weiqiang; Xu, Lixin
The interacting dark energy model could propose a effective way to avoid the coincidence problem. In this paper, dark energy is taken as a fluid with a constant equation-of-state parameter wx. In a general gauge, we could obtain two sets of different perturbation equations when the momentum transfer potential is vanished in the rest fra…