3 papers
astro-ph.CO2025
Planck PR4 (NPIPE) map-space cosmic birefringence
Raelyn Marguerite Sullivan, Arefe Abghari, Patricia Diego-Palazuelos +2
Cosmic birefringence is an effect where the plane of polarisation of the cosmic microwave background (CMB) is rotated by an angle through coupling to a hypothetical parity-vio…
astro-ph.CO2025
Reassessment of the dipole in the distribution of quasars on the sky
Arefe Abghari, Emory F. Bunn, Lukas T. Hergt +4
We investigate recent claims by Secrest et al. of an anomalously large amplitude of the dipole in the distribution of CatWISE-selected quasars on the sky. Two main issues indicate…
astro-ph.CO2024
A glitch in gravity: cosmic Lorentz-violation from fiery Big Bang to glacial heat death
Robin Y. Wen, Lukas T. Hergt, Niayesh Afshordi +1
One regime where we might see departures from general relativity is at the largest accessible scales, with a natural choice in cosmology being the cosmological horizon (or Hubble)…