The recent result of the Dark Energy Spectroscopic Instrument (DESI) in combination with
other cosmological data shows evidence of the evolving dark energy parametrized by the w …

We revisit the evidence for CMB birefringence in the context of a rich Axiverse. Using
probability density functions (PDFs) for various axion parameters, such as the mass and …

We present COSMOGLOBE Data Release 1, which implements the first joint analysis of
WMAP and Planck LFI time-ordered data, processed within a single Bayesian end-to-end …

The evidence for a non-vanishing isotropic cosmic birefringence in recent analyses of the
CMB data provides a tantalizing hint for new physics. Domain wall (DW) networks have …

We study a mechanism of generating the trispectrum (4-point correlation) of curvature
perturbation through the dynamics of a spectator axion field and U (1) gauge field during …

Cosmic birefringence, the observed rotation of the polarization plane of the cosmic
microwave background (CMB), serves as a compelling probe for parity-violating physics …

The presence of axion strings in the Universe after recombination can leave an imprint on
the polarization pattern of the cosmic microwave background radiation through the …

We show that heavy axion domain walls induce domain walls of the QCD axion through a
mixing between the heavy axion and the QCD axion, even when the pre-inflationary initial …

We study the coupling of axions to gauge bosons in heterotic string theory. The axion-gauge
boson couplings in the low energy 4d theory are derived by matching mixed anomalies …

We point out that the rotation angle $\beta $ of cosmic birefringence, which is a recently
reported parity-violating signal in the cosmic microwave background (CMB), has a phase …