The current cosmological model requires new physics beyond the standard model of
elementary particles and fields, such as dark matter and dark energy. Their nature is …

The observed pattern of linear polarization of the cosmic microwave background photons is
a sensitive probe of physics violating parity symmetry under inversion of spatial coordinates …

Axion-like particles (ALPs) can form a network of cosmic strings and domain walls that
survives after recombination and leads to anisotropic birefringence of the cosmic microwave …

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 …

Today, two distinct camps exist in the Physics community: those who believe in the
asymptotic safe gravity program for gravity, and those who don't. Not many physicists are …

The recently reported non-zero isotropic birefringence angle in Planck 2018 polarization
data provides a tantalizing hint for new physics of axions. In this paper, we explain this by a …

A bstract We discover a weak-gravity bound in scalar-gravity systems in the asymptotic-
safety paradigm. The weak-gravity bound arises in these systems under the approximations …

We show that a recent constraint on the cosmic birefringence effect due to dark energy can
be related to the constraints on the coupling of axion dark matter to photon, by relying on a …

We search for the signature of parity-violating physics in the cosmic microwave background,
called cosmic birefringence, using the Planck data release 4. We initially find a birefringence …

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 …