No current unified theory includes quantum mechanics fundamentally as part of its structure. But a truly unified theory must. And I believe the ultimate theory will be geometrically natural. Canonical quantum commutation relations are a Lie bracket, which can be part of a Lie group in a geometrically natural description. I fully expect this will lead to a beautiful quantum-unified theory – what I am currently working on.
I never expected to find beauty in theoretical physics. I stumbled into it, and into E8 in particular, when looking for a naturally geometric description of fermions. But beauty is inarguably there, and I do think it is a good guide for theory building. I also think it is good for researchers to have a variety of aesthetic tastes for what guides and motivates them. The high energy physics community has spent far too much time following the bandwagon of superstring theory, long after the music has stopped playing. It’s time for theorists to spread out into the vast realm of theoretical possibilities and explore different ideas.Garrett Lisi, “Guest Post: Garrett Lisi on Geometric Naturalness” at BackRe(Action)
He also thinks that the “naturalness” aesthetic that the fundamental constants should be near 1 is a “red herring” because “the universe doesn’t seem to care about that.” Many will likely welcome the freedom to explore new ideas.
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See also: Theoretical physicist: Present phase of physics “not normal” – stagnation, not crisis
Sabine Hossenfelder notes that working on the hard mathematical problems led to breakthroughs in physics but fears that, once again, the continued organization of conferences and production of papers will be the choice. Oh, and nonsense: “blathering about naturalness and multiverses and shifting their ‘predictions,’ once again, to the next larger particle collider.”
Is cosmology in crisis over how to measure the universe? One wonders how much of the problem stems from the need for a different universe from the one we have.
Theoretical physicist Sabine Hossenfelder shares her self-doubts about exposing nonsense in cosmology
Sabine Hossenfelder: Free will is compatible with physics