Primordial black holes are under intense scrutiny since the detection of gravitational waves
from mergers of Solar-mass black holes in 2015. More recently, the development of …

Spectral distortions (SDs) of the cosmic microwave background (CMB) provide a powerful
tool for studying particle physics. Here we compute the distortion signals from decaying …

We investigate the consistency of a scenario in which the baryon asymmetry, dark matter,
and the cosmic density perturbation are generated simultaneously through the evaporation …

What is the highest energy at which gravitons can be observed? We address this question
by studying graviton-to-photon conversion—the inverse-Gertsenshtein effect—in the …

We consider a cosmological scenario in which the very early Universe experienced a
transient epoch of matter domination due to the formation of a large population of primordial …

The energy spectrum of the cosmic microwave background (CMB) provides a powerful tool
for constraining standard and non-standard physics in the primordial Universe. Previous …

In the expanding Universe, the average temperature of the cosmic microwave background
(CMB) is expected to depend like T CMB∝(1+ z) on redshift z. Adiabatic photon production …

In the era of gravitational wave (GW) detection from astrophysical sources by LIGO/VIRGO, it
is of great importance to take the quantum gravity effect of graviton-photon (GRAPH) mixing …

Graviton-photon oscillation is the conversion of gravitational waves to electromagnetic
waves and vice versa in the presence of a background electromagnetic field. We investigate …

A bstract In this work I study the effect of graviton-photon mixing in a constant external
magnetic field and find for the first time in the literature exact solution of the equations of …