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: 24 Search : logical
 analogical   آناگوییک   ânâguyikFr.: analogique   Of, relating to, or based on analogy; expressing or implying analogy.→ analogy + -i + → -al. anisotropic homogeneous cosmological model   مدل ِ کیهانشناختی ِ همگن و نا-ایزوگرد   model-e keyhânšenâxti-ye hamgen o nâ-izogardFr.: modèle cosmiologique homogène mais anisotrope   A solution to Einstein's theory of → general relativity that is spatially homogeneous but allows for rotation and/or shear. See also → Bianchi cosmological model.→ anisotropic; → homogeneous; → cosmological; → model. Bianchi cosmological model   مدل ِ کیهانشناختی ِ بیانکی   model-e keyhânšenâxti-ye BianchiFr.: modèle cosmologique de Bianchi   A cosmological model based on the theory of → general relativity, which is homogeneous but → anisotropic. There are actually ten dinstinct Bianchi types, classified according to the particular kinds of symmetry they posses.Luigi Bianchi (1856-1928), Italian mathematician; → cosmological; → model. cosmological   کیهان‌شناختی، کیهان‌شناسیک   keyhânšenâxti, keyhânšenâsikFr.: cosmologique   Pertaining or relating to → cosmology.→ cosmology; → -al. cosmological constant   پایای ِ کیهان‌شناسیک، ~ کیهان‌شناختی   pâyâ-ye keyhânšenâsik, ~ keyhânšenâxtiFr.: constante cosmologique   A term introduced by Einstein into his gravitational → field equations in order to allow a solution corresponding to a → static Universe. The cosmological constant is physically interpreted as due to the → vacuum energy of quantized fields. See also → dark energy.→ cosmological; → constant. cosmological constant problem   پراسه‌ی ِ پایای ِ کیهانشناختی   parâse-ye pâyâ-ye keyhânšenâxtiFr.: problème de la constante cosmologique   The impressive discrepancy of about 120 orders of magnitude between the theoretical value of the → cosmological constant and its observed value. → Quantum field theory interprets the cosmological constant as the density of the → vacuum energy. This density can be derived from the maximum energy at which the theory is valid, i.e. the → Planck energy scale (1018 GeV). The theoretical vacuum → energy density is (1018 GeV)4 = (1027 eV)4 = 10112 erg cm-3. On the other hand, the observed vacuum energy density is estimated to be about (10-3 eV)4 = 10-8 erg cm-3. There is, therefore, a discrepancy of about 120 orders of magnitude.→ cosmological; → constant; → problem. cosmological distance   دورای ِ کیهان‌شناسیک، ~ کیهان‌شناختی   durâ-ye keyhânšenâsik, ~ keyhânšenâxtiFr.: distance cosmologique   The distance to a remote galaxy based on its redshift assuming that the redshift is caused by the → Doppler effect and reflects the general expansion of the Universe.→ cosmological; → distance . cosmological epoch   زیمه‌ی ِ کیهانشناختی   zime-ye keyhânšenâxtiFr.: époque cosmologique   → cosmological; → epoch. cosmological model   مدل ِ کیهان‌شناسیک، ~ کیهان‌شناختی   model-e keyhânšenâsik, ~ keyhânšenâxtiFr.: modèle cosmologique   A mathematical description of the Universe, based on observation, which tries to explain its current aspect, and to describe its evolution during time.→ cosmological; → model. cosmological principle   پروز ِ کیهان‌شناسیک، ~ کیهان‌شناختی   parvaz-e keyhânšenâsik, ~ keyhânšenâxtiFr.: principe cosmologique   The → hypothesis that on → large scales the → Universe is → isotropic and → homogeneous, that is, it appears the same at all places and, from any one place, looks the same in all directions. See also → perfect cosmological principle.Introduced by E.A. Milne in 1933; → cosmological; → principle. cosmological redshift   سرخ کیب ِ کیهان‌شناسیک، ~ کیهان‌شناختی   sorxkib-e keyhânšenâsik, ~ keyhânšenâxtiFr.: décalage vers le rouge cosmologique, redshift ~   The → redshift of a remote object (galaxy, quasar, supenova) due to the expansion of the Universe.→ cosmological; → redshift. current cosmological epoch   زیمه‌ی ِ کیهانشناختی ِ کنونی   zime-ye keyhânšenâxti-ye konuniFr.: époque cosmologique actuelle   The → Universe at the → redshift z = 0.→ current; → cosmological; → epoch. logical   گوییک، گوییکی، گوییکوار   guyik, gyuiki, guyikvârFr.: logique   1) According to or agreeing with the principles of logic. 2) Reasoning in accordance with the principles of logic, as a person or the mind. 3) Of or pertaining to logic (Dictionary.com).→ logic; → -al. logical connective   هابندار ِ گوییکی   hâbandâr-e guyikiFr.: connecteur logique   A symbol that can be combined with one or more → sentences in order to form a new sentence. For example "and" (∧), "or" (∨) "not" (¬), "if-then" (→), and "iff" (⇔).→ logical; → connective. logically equivalent   گوییکانه هموگ‌ارز   guyikâné hamug-arzFr.: logiquement équivalent   Describing two → compound propositions → if and only if they have the same → truth table.→ logical; → equivalent. meteorological observation   نپاهش ِ هواشناختی   napâheš-e havâšenâxtiFr.: observation météorologique   Evaluation or measurement of one or more meteorological elements.Meteorological, of or pertaining to → meteorology; → observation. meteorological observatory   نپاهشگاه ِ هواشناختی   nepâhešgâh-e havâšenâxtiFr.: observatoire météorologique   A scientific establishment dedicated to making precise and detailed meteorological observations and to studying and forecasting atmospheric phenomena by means of special equipments.Meteorological, of or pertaining to → meteorology; → observatory. Milne cosmological model   مدل ِ کیهان‌شناختی ِ میلن   model-e keyhânšenâxti-ye Milne (#)Fr.: modèle cosmologique de Milne   Same as → Milne Universe.→ Milne Universe; → cosmological; → model. morphological   ریخت‌شناختی   rixtšenâxti (#)Fr.: morphologique   Of or relating to → morphology. Same as morphological→ morphologic; → -al. morphological classification   رده‌بندی ِ ریخت‌شناختی   radebandi-ye rixtšenâxti (#)Fr.: classification morphologique   A classification scheme of galaxies based on their apparent shape. → Hubble classification.

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