Definition

1. Proper noun:
   • English theoretical physicist: Paul Adrien Maurice Dirac was a British theoretical physicist who made fundamental contributions to quantum mechanics and quantum electrodynamics.
   • Key achievements: He is renowned for formulating the Dirac equation, which predicted the existence of antimatter, specifically the positron.

Usage Examples

• Proper noun:
  • Paul Adrien Maurice Dirac shared the 1933 Nobel Prize in Physics with Erwin Schrödinger.
  • The Dirac equation, formulated by Paul Adrien Maurice Dirac, describes the behavior of fermions.
  • Paul Adrien Maurice Dirac's work laid the groundwork for modern particle physics.

Advanced Usage

• "Dirac" as an eponym: The surname "Dirac" is often used adjectivally in scientific terms to denote concepts derived from his work.
  • The Dirac delta function is a fundamental concept in mathematical physics.
  • A Dirac fermion is a particle described by the Dirac equation.

Variants and Related Words

• Dirac (adj): Pertaining to the work or theories of Paul Dirac.
  • Dirac notation is a standard notation in quantum mechanics.
• Positron (n): The antimatter counterpart of the electron, predicted by Dirac's theory.
• Antimatter (n): A material composed of antiparticles, whose existence was a consequence of Dirac's equation.

Synonyms

• Theoretical physicist: A scientist who develops theoretical models to explain natural phenomena.
• Quantum theorist: A physicist specializing in the theory of quantum mechanics.

Related Phrases

• Dirac sea: A theoretical model of the vacuum as an infinite sea of particles with negative energy.
• Dirac medal: An award given by the International Centre for Theoretical Physics (ICTP) in his honor.

Noun

1. English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984)