We derive constraints on millicharged dark matter and axionlike particles using pulsar timing
and fast radio burst observations. For dark matter particles of charge ε e, the constraint from …

We perform a comprehensive study of the signatures of Lorentz violation in electrodynamics
on the Cosmic Microwave Background (CMB) anisotropies. In the framework of the minimal …

Millicharged particles (MCPs) arise in many well-motivated extensions of the Standard
Model and are a popular subject for experimental searches. We investigate the attenuation …

Gravitons are the quantum counterparts of gravitational waves in low-energy theories of
gravity. Using Feynman rules one can compute scattering amplitudes describing the …

We present a novel formalism to describe the in vacuo conversion between polarization
states of propagating radiation, also known as generalized Faraday effect (GFE), in a …

Standard models describing the radiation transfer of the cosmic microwave background
(CMB) through Compton scattering predict that cosmological scalar perturbations at linear …

Recent literature has shown that photon-photon forward scattering mediated by Euler-
Heisenberg interactions may generate some amount of the circular polarization (V modes) in …

Generation of cosmic microwave background (CMB) elliptic polarization due to the Cotton–
Mouton (CM) effect in a cosmic magnetic field is studied. We concentrate on the generation …

Abstract Circular (“V-mode”) polarization is expected to be vanishing in the CMB, since it is
not produced in Thomson scattering. However, considering that the conventional CMB …

Gravitational positivity bounds provide consistency conditions for effective field theories with
gravity. They turn out to be phenomenologically useful by providing lower bounds in …