https://pweb.cfa.harvard.edu/news/lates ... asurements
Here's the truth,Latest Results from Cosmic Microwave Background Measurements
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Clues about the inflation should be faintly present in the way the cosmic ripples are curled, an effect due to gravitational waves in cosmic infancy that is expected to be perhaps one hundred times or more fainter than the ripples themselves.
The curling effect produces patterns in the light known as "B-mode polarization," and it is expected to be exceedingly faint. ... snip ... About six years ago, CfA astronomers working at the South Pole reported the first evidence for such curling, "B-mode polarization," at levels consistent with simple models of inflation, but subsequent measurements at different frequencies (or colors) of microwave light revealed the signal to be explainable by galactic dust.
In the years since those first measurements of B-mode polarization astronomers have continued their meticulous observations, adding powerful data from new telescopes at many different frequencies operating at the South Pole. ...snip ... The new results improve the previous best constraints on curling by about a factor of two, and now provide powerful guidance on the kinds of models of inflation that could describe the earliest moments of the universe.
A broad class of simple models is now largely ruled out. The team reports that the most favored of the remaining class of models predict primordial gravitational waves at levels that should be detected (or ruled out) within the next decade with upgraded telescopes at the South Pole.
https://physics.aps.org/articles/v14/135
Squeezing down the Theory Space for Cosmic Inflation
An updated search for primordial gravitational waves has not found a signal, which implies that some popular early Universe models are becoming less viable.