4 papers
What it takes to solve the Hubble tension through scale-dependent modifications of the primordial power spectrum
Nanoom Lee, Matteo Braglia, Yacine Ali-Haïmoud
We investigate scale-dependent modifications to the primordial scalar power spectrum as potential solutions to the Hubble tension. We use the Fisher-bias formalism, recently adapte…
Exact treatment of weak dark matter-baryon scattering for linear-cosmology observables
Yacine Ali-Haïmoud, Suroor Seher Gandhi, Tristan L. Smith
Elastic scattering of dark matter (DM) particles with baryons induce cosmological signals that may be detectable with modern or future telescopes. For DM-baryon scattering cross se…
Cosmic Recombination in the Presence of Primordial Magnetic Fields
Karsten Jedamzik, Tom Abel, Yacine Ali-Haimoud
Primordial magnetic fields (PMFs) may explain observations of magnetic fields on extragalactic scales. They are most cleanly constrained by measurements of cosmic microwave backgro…
CMB polarization non-Gaussianity from accreting primordial black holes
Trey W. Jensen, Yacine Ali-Haïmoud
Primordial black holes (PBHs) would induce non-Gaussianity in the cosmic microwave background (CMB) by sourcing recombination perturbations spatially modulated by relative velociti…