The author of Lost in Math: How Beauty Leads Physics Astray, makes clear that cosmic inflation was intended to deal with evidence for fine-tuning, which she considers a “waste of time.” But, as she shows, the cosmology has gone nowhere.
courseinflation works by postulating an exponential suppression that comes from the dynamical law. And not only this, it furthermore introduces a field which is strictly speaking unnecessary to get the exponential expansion. I thereforedo not buy into the conclusion that inflation is the better explanation. On the very contrary, it adds unnecessary structure.
This is not to say that I think inflation is a bad idea. It’s just that I think cosmologists are focusing on the wrong aspects of the model. Finetuning arguments will forever remain ambiguous because they eventually depend on unjustifiable assumptions. What’s the probability for getting any particular
inflatonpotential tobegin with? Well, if you use the most common measure on the space of all possible function, then all so-far considered potentials have probability zero. This type of reasoning just does not lead anywhere. So why waste time talking about finetuning?
Instead, let us talk about those predictions whose explanatory value does not depend on finetuning arguments, of which I suspect (but do not know) that ET-correlations in the CMB power spectrum
arean example Sabine Hossenfelder, “Inflation: Status Update” at BackRe(Action)
What makes arguments about fine-tuning a waste of time? That is, if the universe is fine-tuned, what would be the consequences of ignoring thedfact? If it isn’t, why does it look that way?
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See also: Sabine Hossenfelder: Is science harmed by an illusion of progress? Tellingly, Hossenfelder adds, “So here is the puzzle: Why can you not find any expert, besides me, willing to publicly voice criticism on particle physics? Hint: It’s not because there is nothing to criticize. ”
Sabine Hossenfelder: Physics Problems That Lead To Breakthroughs Arise From Inconsistencies In Data, Not Beautiful Math
Theoretical Physicist Sabine Hossenfelder Shares Her Self-Doubts About Exposing Nonsense In Cosmology
Cosmic inflation theory loses hangups about the scientific method