# 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: 4 Search : field theory
 classical field theory   نگره‌ی ِ کلاسیک ِ میدان   negare-ye klâsik-e meydânFr.: théorie classique des champs   The theory that studies distributions of → energy, → matter, and other physical quantities under circumstances where their discrete nature is unimportant. Classical field theory traditionally includes → Newtonian mechanics, Maxwell's → electromagnetic theory, and Einstein's theory of → general relativity. The main scope of classical field theory is to construct the mathematical description of → dynamical systems with an infinite number of degrees of freedom. The word "classical" is used in contrast to those field theories that incorporate → quantum mechanics (→ quantum field theory). Classical field theories are usually categorized as → non-relativistic and → relativistic.→ classical; → field; → theory. field theory   نگره‌ی ِ میدان   negare-ye meydânFr.: théorie des champs   1) A theory which uses the concept of → field to describe physical phenomena. It consists of two types: → classical field theory and → quantum field theory. 2) Math.: A branch of mathematics which studies the → fields.→ field; → theory. gravitational-field theory   نگره‌ی ِ میدان ِ گرانشی   negare-ye meydân-e gerâneši (#)Fr.: théorie de champ gravitationnel   A theory that treats gravity as a field rather than a force acting at a distance.→ gravitational; → field. quantum field theory   نگره‌ی ِ کو‌آنتومی ِ میدان   negare-ye kuântomi-ye meydânFr.: théorie quantique des champs   The quantum mechanical theory based on the assumption that the interactions between particles and fields are mediated by messenger particles. Accordingly, particles are → quanta of a field, just s photons are quanta of light. All fields display a granular structure in interaction. QFT is the framework in which quantum mechanics and → special relativity are successfully reconciled (→ Dirac equation). It forms the basis of today's particle physics.→ quantum; → field; → theory.