String theory may be our best attempt at a theory of everything, except that it can’t describe an expanding universe like ours. Now a radical new twist on the idea could fnally fix that – but it requires us to completely reimagine reality.
Jon Cartwright / New Scientist / 19 March 2025
“This may be just a technical difficulty or it may be a reflection of a more fundamental obstruction,” says Ángel Uranga at the Institute for Theoretical Physics in Madrid, Spain.
