An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



Number of Results: 11 Search : flat
taxt (#)

Fr.: plat   

See also:



flat manifold
  بسلای ِ تخت   
baslâ-ye taxt

Fr.: variété plate   


flat; → manifold.

flat rotation curve
  خم ِ چرخش ِ تخت   
xam-e carxeš-e taxt

Fr.: courbe de rotation plate   


flat; → rotation; → curve.

flat Universe
  گیتی ِ تخت   
giti-ye taxt

Fr.: univers plat   


flat; → universe.

  میدان ِ تخت   

Fr.: champ plat   

Exposure of a diffuse and uniform source in order to calibrate the non-uniformity of an imaging detector such as a CCD.

flat; → field.

Meydân, → field; taxt, → flat.

flatness problem
  پراسه‌ی ِ تختی   
parâse-ye yaxti

Fr.: problème de la platitude   

The observed fact that the → geometry of the → Universe is very nearly flat, in other words its density is very close to the → critical density. This would be an extreme coincidence because a → flat Universe is a special case. Many attempts have been made to explain the flatness problem, and modern theories now include the idea of → inflation.

flat; → problem.


Fr.: s'enfler   

To become inflated; to increase, especially suddenly and substantially. → inflation, → inflatory model.

Inflate, from L. inflatus p.p. of inflare "to blow into, puff up," from → in- "into" + flare "to blow."

Pandâmidan "to swell," from pandâm [Mo'in] "swelling;" Borujerdi panâm, panam "swellig;" Malâyeri panomidan "to swell;" Laki penamiyen "to swell;" Hamadâni pandumidan "swelling of the eye or other parts of the body;" Kermâni padum kerdan "to swell," padum "swelled; fat, corpulent;" Tâleši pandâm, pandom "swelling;" Gilaki pandâm kudan "rising of river water caused by flood;" cf. Gk. pneuma "wind; breath," from pnein "to blow; to breathe;" PIE base *pneu- "to breathe." Related terms in other Indo-European languages: O.E. fnaeran "to breathe heavily," fneosan "to snort, sneeze;" M.H.G. pfnusen, pfnehen "to breathe, pant, sniff, snort, sneeze;" Norw. fnysa "to breeze;" M.Du. fniesen, Du. fniezen "to sneeze;" O.H.G. niosan, Ger. niesen "to sneeze."


Fr.: inflation   

1) General: The act of inflating; the state of being inflated.
2) Cosmology: A brief exponential expansion of the Universe postulated to have occurred 10-35 seconds after the → Big Bang, in response to the separation of the → strong interaction from the → electroweak interaction. This idea aims at explaining the → flatness problem, the → horizon problem, and the → magnetic monopole problem. See also → inflaton field.

Verbal noun of → inflate.

inflationary model
  مدل ِ پندامی   
model-e pandâmi

Fr.: modèle d'inflation   

A class of → Big Bang models of the Universe that include a finite period of accelerated expansion in their early histories. Such an event would have released enormous energy, stored until then in the vacuum of space-time. The horizon of the Universe expanded, temporarily, much faster than the speed of light. → inflaton field.

Inflationary, adj. of → inflation; → model.


Fr.: inflaton   

The hypothetical → particle that mediates the hypothetical → inflaton field.

From inflat-, from → inflaton field, + particle suffix → -on.

inflaton field
  میدان ِ اینفلاتون   
meydân-e inflaton

Fr.: champ inflaton   

A hypothetical → scalar field that provides a theoretical basis for → inflation in the early → Big Bang history of the → Universe. The inflaton field would fill space with the same energy at every point. In general, the scalar field can vary with time and space, though to a first approximation everywhere in the Universe will have the same value at any time. The field has a particle associated with it, called → inflaton, just as the → electromagnetic field is associated with the → photon. The inflaton field is characterized also by a → negative pressure that would yield a tremendous → repulsive gravity during a brief lapse of time. In the earliest moments of the Universe, space is uniformly filled with an inflaton field, whose value places it higher up on its → potential energy curve. The inflaton's → potential energy would drop in a tiny fraction of a second, on the order of 10-35 seconds. And yet, during that brief instant, space would expand by a colossal factor, of at least 1030.

inflaton; → field.