To get string theory, you need only four physics assumptions

To get string theory, you need only four physics assumptions Skip to content Subscribe today Every print subscription comes with full digital access Subscribe Now By Emily Conover May 13, 2026 at 12:00 pm Share this: Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print Listen to this article This is a human-written story voiced by AI. Got feedback? Take our survey . (See our AI policy here .) With just a handful of assumptions, string theory stands alone. Based on the idea that all subatomic particles are made up of vibrating strings of energy, string theory is a candidate for a “theory of everything” that could merge disparate branches of physics under one unifying framework. It’s long been a controversial idea, with some scientists embracing it and others arguing that evidence for it is lacking. A team of physicists reports a new detail that doesn’t settle the debate, but does suggest that string theory is unique. Given just four basic physics assumptions, string theory is the only possible option for a theory of everything, theoretical physicist Clifford Cheung and colleagues report in a paper accepted to Physical Review Letters . String theory has garnered skepticism , most famously centering on the issue that its predictions thus far have not been testable — and may never be. Without experimental evidence, physicists will never be able to claim that string theory actually describes the real world. But “you can actually ask a question that’s the next best thing,” says Cheung, of Caltech. “Given things we view as conservative or well-established principles, how unique or inevitable is string theory?” The work is part of “a recent wave of interest in understanding what is special about string theory,” says theoretical physicist Andrea Guerrieri of City St George’s, University of London, who was not in