# 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: 5 Search : singularity
 Big Bang singularity   تکینی ِ بیگ بنگ   takini-ye Big BangFr.: singularité du Big Bang   A hypothetical state of → infinite energy density representing an infinite → gravitational field and infinite → space-time curvature. The singularity arises from using Einstein's theory of → general relativity concerning gravity. We know, however, that when the density and heat become extremely large, quantum physics of gravity becomes important. Yet Einstein's equations ignore quantum effects. In other words, in certain extreme conditions, Einstein's equations do not apply.→ Big Bang; → singularity. initial singularity   تکینی ِ آغازین   takini-ye âqâzin (#)Fr.: singularité initiale   An instant of infinite density, infinite pressure, and infinite temperature where the equations of general relativity break down, if the standard Big Bang theory is extrapolated all the way back to time zero. → singularity.→ initial; → singularity. naked singularity   تکینی ِ برهنه   takini-ye berehné (#)Fr.: singularité nue   A singularity that is not surrounded by an event horizon. It will therefore be visible and communicable to the outside world.→ naked; → singularity. Schwarzschild singularity   تکینی ِ شو‌آرتسشیلد   takini-ye SchwarzschildFr.: singularité de Schwarzschild   A region of infinite → space-time curvature postulated to lie within a → black hole. singularity   تکینی   takini (#)Fr.: singularité   1) Math.: A point at which a given mathematical object is not defined. 2) Physics: A point in → space-time in which gravitational force causes space-time to have infinite curvature; matter is crushed to infinite density and zero volume. This happens at the center of a → black hole where space and time cease to exist as we know them, and the known laws of physics break down. See also → Schwarzschild singularity; → initial singularity.→ singular + → -ity.