Observable tensor-to-scalar ratio and secondary gravitational wave
  background
  In this paper we will highlight how a simple vacuum energy dominated
inflection-point inflation can match the current data from cosmic microwave
background radiation, and predict large primordial tensor to scalar ratio, $r
\sim \mathcal{O}(10^{-3}-10^{-2})$, with observable second order gravitational
wave background, which can be potentially detectable from future experiments,
such as DECi-hertz Interferometer Gravitational wave Observatory (DECIGO),
Laser Interferometer Space Antenna (eLISA), Cosmic Explorer (CE), and Big Bang
Observatory (BBO).
