# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 7 Search : Dirac
 Dirac   دیراک   DiracFr.: Dirac   Paul A. M. Dirac (1902-1984), English theoretical → physicist, one of the founders of → quantum mechanics and → quantum electrodynamics, Nobel Prize for Physics in 1933. → Dirac annihilation, → Dirac equation, → Dirac function, → Dirac constant, → Fermi-Dirac statistics . Dirac annihilation   نابودی ِ دیراک   nâbudi-ye DiracFr.: annihilation de Dirac   Same as → pair annihilation.→ Dirac; → annihilation. Dirac constant   پایای ِ دیراک   pâyâ-ye DiracFr.: constante de Dirac   The → Planck constant divided by 2π and denoted ħ, pronounced h-bar. Also called → reduced Planck constant.→ Dirac; → constant. Dirac equation   هموگش ِ دیراک   hamugeš-e DirâkFr.: équation de Dirac   The equation that describes the behavior of an → electron in a way that combines the requirements of → quantum mechanics with the requirements of → special relativity. The Dirac equation predicted the existence of antimatter→ Dirac; → equation. Dirac function   کریای ِ دیراک   karyâ-ye DirâkFr.: fonction de Dirac   A function of x defined as being zero for all values of x other than x = x0 and having the definite integral from x = -∞ to x = +∞ equal to unity.→ Dirac; → function Dirac's constant   پایای ِ دیراک   pâyâ-ye DiracFr.: constante de Dirac   → Dirac; → constant. Fermi-Dirac statistics   آمار ِ فرمی-دیراک   âmâr-e Fermi-Dirac (#)Fr.: distribution Fermi-Dirac   The statistical distribution of → fermions over the energy states for a system in → thermodynamic equilibrium. In other words, the probability that a given energy level be occupied by a fermion.→ fermi, → Dirac function; → statistics.