Electroweak Phase Transition, Gravitational Waves and Dark Matter in Two
  Scalar Singlet Extension of The Standard Model
  In this paper, the electroweak phase transition, the gravitational waves and
the dark matter issues are investigated in two scalar singlet extension of the
standard model. The detectability of the gravitational wave signals are
discussed by comparing the results with the sensitivity curves of
$\mathbf{eLISA}$, $\mathbf{ALIA}$, $\mathbf{DECIGO}$ and $\mathbf{BBO}$
detectors. It is shown that the results support the recent reports on the dark
matter relic density by $\mathbf{Planck}$ $\mathbf{2018}$ collaboration and the
direct detection experiment by $\mathbf{XENON1T}$ $\mathbf{2018}$
collaboration.
