Is Cosmological inflation still considered as hypothesis? Is CMBR evidence not enough?

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    $\begingroup$ If this is possibly in reference to the article published in Scientific American, it might be worthwhile to explore the response from the protagonists too. $\endgroup$ May 13 '17 at 21:00
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    $\begingroup$ This question is mostly semantic, stemming from the attempts of the education system to clearly distinguish "hypothesis" from "theory". I don't think an answer is possible as I don't think there is a clear separation. $\endgroup$
    – James K
    May 14 '17 at 7:58
  • $\begingroup$ @DhruvSaxena According to my understanding of the scientific american article you linked too, the biggest challenge facing inflation is that it can produce models in which cmb variations do not necessarily (but still can) match the observed cmb patterns. Is this accurate? $\endgroup$
    – user15317
    May 14 '17 at 10:46
  • $\begingroup$ @mikey I ain't capable enough to provide an accurate scientific account. However, to what I understand, think the essence of the antagonist argument is that because the universe appears to be fine tuned (ratios of dark energy and matter density - in nearly isotropic distribution - as evidenced by CMB), it should have been such from the beginning, rather than becoming fine tuned and flattening out due to Inflation, later (although Inflationary theory itself is fuzzy about Planck Era). So, per them, either Inflation is not needed at all, or that if it occurred then it wouldn't have ever stopped. $\endgroup$ May 15 '17 at 0:01
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    $\begingroup$ This is a comment rather than an answer because I too am not qualified. My understanding of what motivated the development of cosmic inflation as a concept was to solve what appeared to be a fine-tuning problem, the apparent uniformity of the CMBR. However, inflation as a concept has been fine-tuned (there are multiple versions of cosmic inflation), and each has its own fine-tuning problem. There are a number of physicists and cosmologists who neither accept nor reject the concept of cosmic inflation. They instead are on the fence, leaving it as a hypothesis rather than a theory. $\endgroup$ May 15 '17 at 8:45

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