📜 Theorem, law or theory

Cosmic inflation theory

Teoría de la inflación cósmica

Date
1980-1981 · confidence high
Place
Menlo Park, California, United States
Credited to
Alan Guth; independently proposed by Alexei Starobinsky and Andrei Linde
Field
Cosmos & Earth

⚠️ Disputed: the sources disagree.

What was discovered

Guth proposed that the early universe underwent a brief exponential expansion to resolve the flatness, horizon and magnetic-monopole problems; Starobinsky had proposed a similar model shortly before in the USSR.

Priority is disputed with Starobinsky (1980) and Demosthenes Kazanas (1980); Guth coined the term 'inflation' and popularised the theory.

What it led to

  • Testable predictions about the cosmic microwave background
  • Later models of eternal inflation and the multiverse
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Sources✓ verified 2026-09-25