# 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: 13 Search : operator
 annihilation operator   آپارگر ِ نابودی   âpârgar-e nâbudiFr.: opérateur d'annihilation   In → quantum field theory, the operator that lowers → eigenstates one → energy level, contrarily to the → creation operator.→ annihilation; → operator. creation operator   آپارگر ِ آفرینش   âpârgar-e âfarinešFr.: opérateur de création   An operator that acts on the → eigenstate describing the → harmonic oscillator to raise its → energy level by one step. The creation operator is the → Hermitian conjugate operator of the → annihilation operator.→ creation; → operator. d'Alembertian operator   آپارگر ِ دالامبر   âpârgar-e d'AlembertFr.: d'alembertien   A second order, → partial differential operator in space-time, defined as: ▫2 = ∂2/∂x2 + ∂2/∂y2 + ∂2/∂z2 - (1/c2)∂2/∂t2, or ▫2 = ∇2 - (1/c2)(∂2/∂t2), where ∇2 is the → Laplacian and c is the → speed of light. This operator is the square of the → four-dimensional operator  ▫, which is Lorentz invariant. del operator   آپارگر ِ دل   âpârgar-e delFr.: opérateur del   In → vector calculus, a vector → partial derivative represented by the symbol → nabla and defined in three dimensions to be: ∇ = (∂/∂x)i + (∂/∂y)j + (∂/∂z)k. It appears in the operations → gradient: ∇f, → divergence: ∇ . E, → curl: ∇ x E, and → Laplacian: ∇ . ∇f = ∇2f.From Gk. alphabet letter delta. four-dimensional operator   آپارگر ِ چهار-وامونی   âpârgar-e cahâr-vâmuniFr.: opérateur à quatre dimensions   An operator defined as: ▫ = (∂/∂x, ∂/∂y, ∂/∂z, 1/(jc∂/∂t).→ four; → dimensional; → operator. Hamiltonian operator   آپارگر ِ هامیلتون   âpârgar-e HamiltonFr.: opérateur hamiltonien   The dynamical operator in → quantum mechanics that corresponds to the → Hamiltonian function in classical mechanics. Hermitian operator   آپارگر ِ اِرمیتی   âpârgar-e HermitiFr.: opérateur hermitien   An operator A that satisfies the relation A = A*, where A* is the adjoint of A. → Hermitian conjugate. identity operator   آپارگر ِ ایدانی   âpârgar-e idâniFr.: opérateur d'identité   An operator which takes a real number to the same real number.→ identity; → operator. integral operator   آپارگر ِ دُرُستالی   âpârgar-e dorostâliFr.: opérateur intégral   Math.: An operator whose inverse is a differential operator.→ integral; → operator. Laplace operator   آپارگر ِ لاپلاس   âpârgar-e LaplaceFr.: opérateur de Laplace   Same as → Laplacian.→ Laplace; → operator. operator   آپارگر   âpârgarFr.: opérateur   Math.: Something that acts on another function to produce another function. In linear algebra an "operator" is a linear operator. In calculus an "operator" may be a differential operator, to perform ordinary differentiation, or an integral operator, to perform ordinary integration.From → operate; + → -or. quantum-mechanical operator   آپارگر ِ مکانیک ِ کو‌آنتومی   âpârgar-e mekânik-e kuântomiFr.: opérateur en mécanique quantique   A linear → Hermitian operator associated with a physical quantity.→ quantum; → mechanics; → operator. unitary operator   آپارگر ِ یکایی   âpârgar-e yekâyiFr.: opérateur unitaire   A linear operator whose inverse is its → adjoint. In addition to → Hermitian operators, unitary operators constitute a fundamentally important class of quantum-mechanical operators.→ unitary; → operator.