What is string theory?

String theory is a theoretical framework positing fundamental one-dimensional strings rather than point particles. As of 2026, it remains unconfirmed, with key predictions like supersymmetry not yet observed.

• Apr 2026 - Brian Greene said string theory’s hope rested on finding supersymmetry at the Large Hadron Collider, but those particles were not found.
• Apr 2026 - Brian Greene noted that string theory requires 10 dimensions, derived from the condition that the dimension minus 10 must equal zero.
• Apr 2026 - Brian Greene suggested the term “string hypothesis” because the theory has not made a testable prediction.
• May 2026 - Don Lincoln stated he does not believe in superstrings, calling it a fascinating idea.
• May 2026 - Michio Kaku described string theory as implying no initial bang, but a collapse and rebound.
• May 2026 - Don Lincoln predicted that 30 years from now, progress will be minimal.