An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



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Number of Results: 732
relative tensor
  تانسور ِ بازانی   
tânsor-e bâzâni

Fr.: tenseur relatif   

A generalized tensor concept that is characterized by a → Jacobian matrix of transformation raised to a power called → weight of a tensor density. In practice, only relative tensors of weight 1 or -1 are used. The product of a relative tensor of weight -1 by another tensor of weight 1 is an → absolute tensor. Same as → tensor density.

relative; → tensor.

relative vector
  بردار ِ بازانی   
bordâr-e bâzâni

Fr.: vecteur relatif   

A → relative tensor of → order  → one.

relative; → vector.

relative velocity
  تندای ِ بازانی   
tondâ-ye bâzâni

Fr.: vitesse relative   

For two objects A and B, the velocity which B, supposing itself at rest, assigns to A.

relative; → velocity.

  بازانی‌وار، بازانانه   
bâzânivâr, bâzânâné

Fr.: relativement   

In a relative manner; in relation to something else.

From → relative + -ly "-vâr, -âné."


Fr.: relativisme   

The belief that truth is relative and may vary from individual to individual, from group to group, or from time to time, having no objective standard.

From → relative + -ism a suffix used in the formation of nouns denoting action or practice, state or condition, principles, doctrines, etc.

Bâzâni-bâvari, from bâzâni, → relative, + bâvari, from bâvar "belief" (Mid.Pers. wâbar "beleif;" Proto-Iranian *uar- "to choose; to convince; to believe;" cf. Av. var- "to choose; to convince" varəna-, varana- "conviction, faith;" O.Pers. v(a)r- "to choose; to convince;" Skt. vr- "to choose," vara- "choosing").


Fr.: relativiste   

An adherent or advocate of relativism.

From → relative + -ist a suffix of nouns.

Adj. from → relativism.

  بازانیگی‌مند، بازانیگی‌ور   
bâzânigimand, bâzânivar

Fr.: relativiste   

1) Physics: Relating to the → relativity theory.
2) Philosophy: Involving or characterized by → relativism.
See also:
non-relativistic, → relativistic aberration, → relativistic Doppler effect, → relativistic effect, → relativistic mass, → relativistic particle, → relativistic precession, → relativistic quantum mechanics, → relativistic redshift, → relativistic speed, → relativistic spin precession, → relativistic velocity, → ultrarelativistic, → ultrarelativistic gas.

From → relativist + → -ic.

relativistic aberration
  بیراهش ِ بازانیگی‌مند   
birâheš-e bâzânigimand

Fr.: aberration relativiste   

The aberration of light for an object moving with → relativistic speed. In contrast to the classical case, the → Lorentz transformation between the → rest frame of the observer and that of the object must be used. Relativistic aberration is expressed by the equation: cos φ' = (cos φ - )/(1 - cos φ.v/c), where φ is the classical → aberration angle, v the speed of the Earth, and c the → speed of light. It can also be expressed as: tan φ' = -(c/v)(1 - v2/c)1/2.

relativistic; → aberration.

relativistic Doppler effect
  اُسکر ِ دوپلر ِ بازانیگی‌مند   
oskar-e Doppler-e bâzânigimand

Fr.: effet Doppler relativiste   

The Doppler effect when the relative motion of the source and the observer is comparable to the speed of light. In that case the classical Doppler formula should be corrected for effects of the special theory of relativity (Lorentz transformation).

relativistic; → Doppler effect.

relativistic effect
  اسکر ِ بازانیگی‌مند   
oskar-e bâzânigimand

Fr.: effet relativiste   

A physical phenomenon described only by the theories of → special relativity or → general relativity.

relativistic; → effect.

relativistic mass
  جرم ِ بازانیگی‌مند   
jerm-e bâzânigimand

Fr.: masse relativiste   

In → special relativity, the mass that is assigned to a body in motion. Einstein demonstrated that the velocity of the observer has an effect on the way inertial mass is measured. The relativistic mass is expressed by mt = m0 / [1 - (v/c)2]1/2, where m0 is the → rest mass, v is the velocity, and c the → velocity of light. The experimental evidence for this phenomenon is observed in the mass of high-speed electrons accelerated by magnetic fields. This formula shows that it is impossible for a mass to be accelerated to the velocity of light in a vacuum.

relativistic; → mass.

relativistic particle
  ذرّه‌ی ِ بازانیگی‌مند   
zarre-ye bâzânigimand

Fr.: particule relativiste   

A particle which has a speed comparable to the velocity of light.

relativistic; → particle.

relativistic precession
  پیشایان ِ بازانیگی‌مند   
pišâyân-e bâzânigimand

Fr.: précession relativiste   

A → general relativistic phenomenon in which the line joining the → apsides of an orbit gradually rotates in a → prograde direction. Also called the → orbital precession and → perihelion precession. Although the general relativistic precession of Mercury's orbit is extremely small, the similar precession observed in the orbit of the → binary pulsar PSR B1913+16 amounts to 4.23 degrees per year, i.e. 36,000 times greater than the → advance of perihelion of Mercury.

relativistic; → precession.

relativistic quantum mechanics
  کو‌آنتوم مکانیک ِ بازانیگی‌مند   
kuântom mekânik-e bâzânigimand

Fr.: mécanique quantique relativiste   

A quantum theory that incorporates special relativity, for example, → quantum electrodynamics.

relativistic; → quantum mechanics.

relativistic redshift
  سرخ‌کیب ِ بازانیگی‌مند   
sorx kib-e bâzânigimand

Fr.: décalage vers le rouge relativiste   

A redshift caused by the → relativistic Doppler effect. → gravitational redshift.

relativistic; → redshift.

relativistic speed
  تندی ِ بازانیگی‌مند   
tondi-ye bâzânigimand

Fr.: vitesse relativiste   

Same as → relativistic velocity.

relativistic; → speed.

relativistic spin precession
  پیشایان ِ آسه‌ی ِ چرخش ِ بازانیگی‌مند   
pišâyân-e âse-ye carxeš-e bâzânigi-mand

Fr.: précession de l'axe de rotation relativiste   

The change in the direction of the → rotation axis of a → pulsar in a → binary pulsar. In such a system, → geodetic precession leads to a relativistic → spin-orbit coupling, analogous of → spin-orbit coupling in atomic physics. In consequence, the pulsar spin precesses about the total → angular momentum, changing the relative → orientation of the pulsar toward Earth (Damour & Ruffini, 1974). As a result, the angle between the pulsar → rotation axis and our → line of sight changes with time, so that different portions of the emission beam can be observed leading to changes in the measured pulse profile. In extreme cases, the precession may even move the beam out of our line of sight and the pulsar may disappear as predicted for PSR 1913+16 for the year 2025.

relativistic; → spin; → precession.

relativistic velocity
  تندای ِ بازانیگی‌مند   
tondâ-ye bâzânigimand

Fr.: vitesse relativiste   

The velocity of a body when it is a significant fraction of the → speed of light.

relativistic; → velocity.


Fr.: relativité   

General: The state or fact of being relative.
Physics: 1) Short for the → Galilean relativity.
2) Short for the → relativity theory of Einstein.

Relativity, from → relative + → -ity.

relativity of simultaneity
  بازانیگی ِ همزمانی   
bâzânigi-ye hamzamâni

Fr.: relatitivité de simultanéité   

A basic concept of → special relativity whereby → events that are simultaneous in one → reference frame are not simultaneous in another reference frame moving with respect to the first.

relativity; → simultaneity.

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