3 papers
astro-ph.CO2025
Stairway to Axions: the cross-correlation of birefringence and galaxies from NPIPE and Quaia
S. Arcari, N. Bartolo, G. Fabbian +6
We present the first measurement of the cross-correlation between anisotropic birefringence and galaxy number counts, utilizing polarization data from Planck NPIPE and the Quaia qu…
astro-ph.CO2024
Breaking parity: the case of the trispectrum from chiral scalar-tensor theories of gravity
Tommaso Moretti, Nicola Bartolo, Alessandro Greco
Recently, possible hints of parity violation have been observed in the connected galaxy four-point correlation function. Although the true origin of the signal from the analysis ha…
astro-ph.CO2024
Conversations in the dark: cross-correlating birefringence and LSS to constrain axions
S. Arcari, N. Bartolo, A. Greco +3
Unveiling the dark sector of the Universe is one of the leading efforts in theoretical physics. Among the many models proposed, axions and axion-like particles stand out due to the…