5 papers
Simultaneous inference of isotropic and anisotropic polarization rotation angles for next-generation cosmic microwave background experiments
Yue Zhang, Chang Feng, Sen Li +1
The ultrahigh-sensitivity polarization imaging of the cosmic microwave background (CMB) is a treasure trove for new physics. Searching for a predicted polarization angle rotation k…
Inference of -mode polarization in the presence of non-Gaussian foregrounds
Sen Li, Chang Feng, Filipe B. Abdalla
The inflationary -mode signals encode invaluable information about the origin of our Universe and searching for potential signatures of primordial gravitational waves (PGWs) is…
Improved constraints on ultralight axions using latest observations of the early and late Universe
Qianshuo Liu, Chang Feng, Filipe B. Abdalla
Ultralight axions (ULAs) are hypothetical particles which can behave like dark matter (DM) or dark energy (DE) depending on masses generated at the symmetry-breaking scale. It rema…
Investigating cross-correlations between cosmic microwave background lensing and 21 cm intensity mapping
Alessandro Marins, Chang Feng, Filipe B. Abdalla
The neutral hydrogen (HI) signal is a crucial probe for astrophysics and cosmology, but it is quite challenging to measure from raw data because of bright foreground contaminants a…
Detecting ultralight axions from multifrequency observations of neutral hydrogen intensity mapping
Qianshuo Liu, Chang Feng, Filipe B. Abdalla
We investigate the effects of ultralight axions (ULAs) on the differential brightness temperature fluctuations of neutral hydrogen at the post-reionization stage. Unique structure…