Forecasting Interacting Vacuum-Energy Models using Gravitational Waves
  The physics of the dark sector has remained one of the controversial areas of
modern cosmology at present and hence it naturally attracts massive attention
to the scientific community. With the developments of the astronomical data,
the physics of the dark sector is becoming much more transparent than it was
some twenty years back. The detection of gravitational waves (GWs) has now
opened a cluster of possibilities in the cosmological regime. Being motivated
by the detection of GWs and its possible impact on the physics of dark matter
and dark energy, in this work we focus on the interacting dark energy models.
Assuming the simplest possibility in which the vacuum energy with
equation-of-state $w_x =-1$ is allowed to interact with the pressureless dark
matter, we have extracted the constraints of the cosmological parameters. We
find that the addition of the GWs data to the CMB measurements significantly
improves up to a factor 4 of the parameters space, and up to a factor 2 for the
full combination of current cosmological datasets, namely
CMB+BAO+Pantheon+RSD+R16+CC+WL. The most affected parameters by the inclusion
of the GWs are $\Omega_ch^2$, $\theta_{MC}$, $\xi$, and the derived parameters
$\Omega_{m0}$, $\sigma_8$ and $H_0$.
