Sabine Hossenfelder and others think it’s unlikely because the latest Planck Satellites didn’t support some observations such as: http://backreaction.blogspot.com/2017/10/is-inflationary-universe-scientific.html https://www.scientificamerican.com/article/cosmic-inflation-theory-faces-challenges/ “Notably, if we knew inlation had occurred, there is one feature we could be fairly certain of inding in the Planck CMB observations because it is common to all the simplest forms of inlationary energy, including those presented in standard textbooks. At the same time that quantum luctuations produce random variations in inlationary energy, they also produce random warps in space that propagate as waves of spatial distortion across the universe once inlation ends. These disturbances, known as gravitational waves, are another source of hot and cold spots in the cosmic microwave background radiation, albeit ones that have a distinctive polarizing efect (that is, the gravitational waves cause light to have a certain preferred orientation for its electric ield, depending on whether the light comes from a hot or cold spot, or some place in between). Unfortunately, the search for inlationary gravitational waves has not panned out. Although cosmologists irst observed hot and cold spots with the COBE (COsmic Background Ex plorer) satellite in 1992 and with many subsequent experiments, in - cluding even more recent Planck satellite results from 2015, they have not found any signs of the cosmic gravitational waves expected from inflation, as of this writing, despite painstaking searches for them. (On March 17, 2014, scientists at the BICEP2 experiment at the South Pole announced the detection of cosmic gravitational waves but later retracted their claim when they realized they had actually observed a polarization effect caused by dust grains within the Milky Way.) Note that these expected cosmic gravitational waves have nothing to do with the gravitational waves created by merging black holes in the modern universe found by the Laser Interferometer Gravitational wave Observatory (LIGO) in 2015.” May I know your thoughts and arguments about this?