We calculate the low-redshift Taylor expansion for the luminosity distance for an observer at the center of a spherically symmetric matter inhomogeneity with a non-vanishing cosmological constant. We then test the accuracy of the formulas comparing them to the numerical calculation for different cases...
摘要: This paper corrects the explanation given by Oliveira and Hartnett, Found. Phys. Lett. 19(6), 519–535, 2006 for the luminosity distance in Cosmological General Relativity. The mathematical expression...关键词: Carmeli’s cosmology luminosity distance angular size surface brightness ...
Define luminosity. luminosity synonyms, luminosity pronunciation, luminosity translation, English dictionary definition of luminosity. n. pl. lu·mi·nos·i·ties 1. The condition or quality of being luminous. 2. Something luminous. 3. The ratio of lumin
Its high luminosity and large distance (about 1,500 light years) give it an apparent visible magnitude of 5.1. WikiMatrix At O2–O4, the distinction between main sequence and supergiant stars is narrow and may not even represent true luminosity or evolutionary differences. WikiMatrix An except...
We use the formula m = m - 5 + 5 · log10(D), where D is the distance between the star and Earth. How do I calculate the luminosity? We compute luminosity with the following formula: L = σ· A · T4 where: σ— Stefan-Boltzmann constant, equal to 5.670367 × 10-8 W/(m2·...
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The density falls off rapidly with increasing distance from the meteoroid, while the temperature increases. This region may be the source of an emitting gas (T≈ 10 000 K) detected in bright fast meteors. The size of the vapor cloud is a function of particle mass and speed, and about 1...
What is the sun's angular distance? What is the approximate percentage of the Earth that is illuminated by the sun at any given time? What is the temperature of a star that appears most intense at a wavelength of 483 nm (in Kelvin)?
Here [[PHI].sub.bol](L, z) is a bolometric luminosity function (defined for the luminosity L integrated over all wavelengths) and [bar.[eta]] represents an averaged radiation efficiency that is assumed not to depend on z or L in this formula. (12) The bolometric luminosity function of...
In the above formula the evolution of Hubble parameter is different in the FLRW universe and for a Friedmann brane. 2.2 The luminosity distance-redshift relation for flat FLRW universe with cosmological constant For the flat FLRW, the Friedmann equation which gives to the evolution of the...