Journal or Publication Title:

Բյուրականի աստղադիտարանի հաղորդումներ: Երևանի աստղադիտարանի բյուլետեն = Сообщения Бюраканской обсерватории. Бюллетень ереванской Астрономической обсерватории = Contributions from the Burakan observatory. Bulletin of the Erevan astronomical observatory

Date of publication:

2021

Volume:

68

Number:

1

ISSN:

2579-2276

Coverage:

12-31

Abstract:

We describe what is essentially a correct solution to the kinematic interpretation of cosmological redshifts in standard cosmological model. In the framework of stretching of space point of view of standard cosmological model, we study the "lookforward" history of expanding universe, subject to certain rules, in order to defne the kinetic recession velocity of luminous source along the observer's line-of-sight in unique way, straightforwardly in terms of cosmological redshift. In doing this, we use an alternative way of separating the spectral shifts into infnitesimally displaced relative spectral bins between adjacent emitter and absorber consequent on expansion of the universe, measured at infnitesimally separated space-time points, and sum over them to overcome the ambiguity which presents the parallel transport of four-velocity of source to an observer in the Robertson-Walker curved space-time. The crux of our solution - the kinetic recession velocity of comoving astronomical object, is always subluminal even for large redshifts of order one or more, so that it does not violate the fundamental physical principle of causality. Our analysis establishes the ubiquitous relationship of overall cosmological redshift and kinetic recession velocity, which is utterly distinct from a familiar global Doppler shift formula. A difference of global Doppler velocity and kinetic recession velocity, for redshifts 0:9 ≤ z ≤ 800, is ≥ 0:072c, where a maximum value, 0:187c, is reached at redshifts z = 4:5 - 5:1. In particular case of such an implementation along the null geodesic, we show that the kinetic recession velocity is reduced to a well known global Doppler velocity. We discuss the implications for the case of a zero-density cosmological model of Milne universe, whereas a correspondence to the more usual special relativity notion of relative speed retains. In Table 1, we are summing up kinetic recession velocities of some typical distant astronomical objects with spectroscopic redshift determinations collected from the literature.

Format:

pdf

Identifier:

oai:arar.sci.am:292905

Language:

en

General note:

Communications of the Byurakan Astrophysical Observatory (ComBAO) is a peer-reviewed scientific journal, which publishes research in observational and theoretical astronomy/astrophysics and presents recent advances in these fields. It is being published by the NAS RA V. Ambartsumian Byurakan Astrophysical Observatory (BAO) in English in electronic form. The journal publishes original papers, review papers, brief reports, book reviews, special communications, observational and theoretical results in various fields of astronomy and related sciences, and some editorial notes, including anniversaries and obituaries. Under the heading “Legacy”, the renewed magazine will republish some old articles of high value in English. The heading “Guest articles” will bring to the attention of readers the articles of researchers who are not employees of BAO. ComBAO was founded in 1946 and regularly published in 1946-1990. However, the publication was interrupted because of the economic situation after the disintegration of the Soviet Union in 1991.

Location of original object:

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