In this work we shall calculate in detail the effect of an GW170817-compatible Einstein–
Gauss–Bonnet theory on the energy spectrum of the primordial gravitational waves. The …

We discuss how tensor polarizations of gravitational waves can suffer Landau damping in
the presence of velocity birefringence, when parity symmetry is explicitly broken. In …

In the context of the metric-affine Chern-Simons gravity endowed with projective invariance,
we derive analytical solutions for torsion and nonmetricity in the homogeneous and isotropic …

We discuss some general and relevant features of longitudinal gravitational modes in
Horndeski gravity and their interaction with matter media. Adopting a gauge-invariant …

In this paper, the polarization modes of gravitational waves in Horndeski gravity are studied
under the Palatini formalism. After obtaining the linearized equation of perturbations in …

Gravitational waves travel through the distributions of matter and dark energy during
propagation. For this reason, gravitational waves emitted from binary compact objects serve …

A general linear gauge-invariant equation for dispersive gravitational waves (GWs)
propagating in matter is derived. This equation describes, on the same footing, both the …

Abstract The Lambda-Cold Dark Matter model explains cosmological observations most
accurately till date. However, it is still plagued with various shortcomings at galactic scales …

We study the dispersion properties of electron plasma waves, or plasmons, which can be
excited in quantum plasmas in the nonlinear regime. In order to describe nonlinear electron …

While general relativity predicts only two tensor modes for gravitational-wave (GW)
polarization, general metric theories of gravity allow for up to four additional modes …