String theory is uniquely derived from basic assumptions about the universe, physicists show
https://phys.org/news/2026-05-theory-uniquely-derived-basic-assumptions.html
String theory is uniquely derived from basic assumptions about the universe, physicists show
https://phys.org/news/2026-05-theory-uniquely-derived-basic-assumptions.html
6 Comments
From the article:
“If you could take an apple and break it into smaller and smaller parts, you would find molecules, then atoms, followed by subatomic particles like protons and the quarks and gluons that make them up. You might think you hit the bottom, but, according to string theorists, if you keep going to even smaller scales—about a billion billion times smaller than a proton—you will find more: tiny vibrating strings.”
## SUMMARY
**TL;DR:** Caltech physicists derived string theory from scratch using just two basic mathematical assumptions about particle behavior — without assuming strings exist at all — suggesting the theory may be the universe’s unique solution to the problem of quantum gravity.
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String theory, developed in the 1960s, proposes that everything in the universe is made of unimaginably tiny vibrating strings. It emerged as a leading candidate for reconciling two otherwise incompatible frameworks: quantum mechanics (governing the very small) and general relativity (governing the very large, including gravity). When physicists try to combine the two, their equations produce nonsensical infinities — and string theory’s mathematics elegantly resolves that problem.
The catch: testing it would require a particle collider the size of a galaxy. So a Caltech-led team took a different route, using a “bootstrap” approach — starting from a few basic assumptions about how particles should behave at very high energies and working forward to see what theory emerges. Their two assumptions were that particle scattering probability drops off at extreme energies (called “ultrasoftness”) and that interactions vanish at certain special mathematical points (“minimal zeros”).
From those two constraints alone, string theory fell out as the only possible solution — including its full spectrum of particle masses, spins, and interaction strengths. Crucially, the researchers assumed nothing about strings at all going in.
While this isn’t experimental proof, it is theoretically significant: the same assumptions could have yielded infinite possible theories, but they yielded exactly one. As lead physicist Clifford Cheung put it, “The strings just fell out.” The finding also sharpens the question of what would need to change if string theory turns out to be wrong — which itself is a valuable tool for exploring alternatives.
I feel too many physicists are working on string theory, basically putting too many eggs in one basket. It’s an interesting theory but has yielded nothing practical for decades now. Im sure this will be an unpopular opinion
Here we go again.
I will quote Peter Woit here, and you can read his opinion [here](https://www.math.columbia.edu/~woit/wordpress/?p=15647):
>a campaign by string theorists to argue that we have to accept string theory as our theory of fundamental physics even though there is no evidence for it because it is “unique”, the only possible theory. This is obviously utter nonsense
I never understood string theory. Every single time I try to read about it I’m just amazed at how they hand wave the “tiny vibrating strings” bit. In my head I’m thinking wait… What? Strings? Strings made of what?
The only thing I’ve been able to conclude, perhaps wrongly, is that no one *actually* thinks the strings exist. They just like that some of the math works, and the string shit is how they describe the math.
In before the string theory haters who only know about from pop sci sho… oh, too late.