The kinematic origin of the cosmological redshift

Bunn, Emory F.; Hogg, David W.

doi:10.1119/1.3129103

Cited by 61 publications

(79 citation statements)

References 22 publications

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“…(1). It was pointed out recently [5][6][7] that in specific cases further simplification occurs and Eq. (2) is a function of a single parameter, namely relative speed:…”

Section: Kinematical Origin Of Spectral Shift: Schwarzschild Spacetimmentioning

confidence: 99%

“…It was shown [5,6], that Eq. (3) with the upper label applies for co-moving observers in FLRW spacetime resulting in the cosmological redshift.…”

Section: Kinematical Origin Of Spectral Shift: Schwarzschild Spacetimmentioning

confidence: 99%

“…In both these views the relative speed, v SO , is defined in terms of the scalar product of O's velocity and parallel transported the velocity of S to O. The difference between the claims of the authors in [5,6] and [7] appears to be due to the different paths for the parallel transport: S velocity is shifted along a null geodesic in the former case, and is shifted on the hypersurface of constant time in the latter case. Two particular issues in this discussion are interesting.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the nature of the cosmological redshift has been the subject of controversy [5][6][7]. Narlikar [5] and then Bunne and Hogg [6] showed that cosmological redshift depends solely on relative speed; hence it is a purely kinematical effect. Chodorowski [7] argued that this is a more complex effect, involving also a gravitational contribution.…”

Section: Introductionmentioning

confidence: 99%

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On the nature of cosmological redshift and spectral shift in Schwarzschild-like and other spacetimes

2012

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The kinematical nature of the spectral shift in different types of spacetime, cosmological redshift and frequency shift in Schwarzschild spacetime being the most prominent representatives, has been a subject of recent interest. We demonstrate that the kinematical nature of the spectral shift is an inherent feature of the particular type of spacetimes. The general solution is found: necessary and sufficient conditions for the spectral shift arising from a kinematical origin are formulated. The status of the relative speed is discussed.Keywords Generalized Doppler effect · Relative and recession speeds · Schwarzschild spacetime · Friedmann-Lemaître-Robertson-Walker spacetime

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“…(1). It was pointed out recently [5][6][7] that in specific cases further simplification occurs and Eq. (2) is a function of a single parameter, namely relative speed:…”

Section: Kinematical Origin Of Spectral Shift: Schwarzschild Spacetimmentioning

confidence: 99%

“…It was shown [5,6], that Eq. (3) with the upper label applies for co-moving observers in FLRW spacetime resulting in the cosmological redshift.…”

Section: Kinematical Origin Of Spectral Shift: Schwarzschild Spacetimmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the nature of cosmological redshift and spectral shift in Schwarzschild-like and other spacetimes

2012

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“…Though the isomorphism is non-relativistic, a number of author's have used the Bateman-Cunningham group in relativistic studies of Hubble's relations. The full Lie group was used by Hoyle, Burbidge, and Narlikar 6 to develop a generalized relativistic cosmology, and Bunn and Hogg 7 have used relativistic parallel-transport arguments to give kinematic treatments of Hubble's relations. In a quite general investigation of the Bateman-Cunningham Lie group, L. M. Tomilchik 8 argued that the anomalous frequency shifts uncovered in the Pioneer 10 and 11 programs imply that Hubble's relations are in fact the result of coordinate transformations of the group.…”

Section: Introductionmentioning

confidence: 99%

Ambiguous red shifts

Wulfman¹

2010

AIP Conference Proceedings

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Dedicated to the memory of Marcos Moshinsky who contributed so much to science and provided so many opportunities to so manyA one-parameter conformal invariance of Maxwell's equations allows the wavelengths of electromagnetic waves to change as they propagate, and do so even in otherwise fieldfree space. This produces an ambiguity in interpretations of stellar red shifts. Experiments that will determine the value of the group parameter, and thereby remove the ambiguity, are proposed. They are based on an analysis of the anomalous frequency shifts uncovered in the Pioneer 10 and 11 spacecraft studies, and physical interpretation of an isomorphism discovered by E. L. Hill. If the group parameter is found to be non-zero, Hubble's relations will have to be reinterpreted and space-time metrics will have to be altered. The cosmological consequences of the transformations are even more extensive because, though they change frequencies they do not alter the energy and momentum conservation laws of classical and quantum-electrodynamical fields established by Cunningham and by Bialynicki-Birula.

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Retracted: New aspects of photon propagation in expanding universes

Fahr

Heyl

2017

Astron Nachr

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Background: Modern cosmology assumes that the cosmic microwave background (CMB) radiation is a relict of the much hotter electromagnetic radiation field from the early recombination era of the universe. Its present very low radiation temperature T CMB = 2.735 K thereby is explained by the fact that the cosmic photons in the expanding universe undergo a wavelength stretching according to 𝜆/𝜆0 = S/S 0 , where S denotes the scale of the universe. The present-day CMB temperature hence simply expresses the factor by which the universe has grown since the recombination era. Materials and Methods: On the basis of well-known facts of Special and General Relativity (SRT and GRT), we reinvestigate the behavior of freely propagating cosmic photons in dynamic Robertson-Walker spacetime geometries and show that in the system of the propagating photon, due to the fact that no time lapses in this proper system, the photon does not change its initial state, that is, its wavelength and energy. We do, however, also show that the global beat of the time changes with the cosmic world time or the cosmic scale S. That means cosmic photons do not change their state, till they are registered by a local detector, that is, a local clock. Results: We claim that the energy density of cosmic photons which enters the energy-momentum tensor of Einstein's GRT field equations does not scale like S −4 as assumed in present-day cosmology, but like S −3 , that is, identically to the behavior of the energy densities of baryonic or dark matter, meaning that the energy density of photons in the present-day universe cannot be neglected, but counts substantially for the expansion history of the universe. Nevertheless, we show that cosmic photons measured with a present-day detector (local clock) locally will show their cosmological redshift, explaining the present-day CMB Planck spectrum with a Planck temperature of 2.735 K. Conclusions: As the energy density of cosmic photons cannot be neglected, their contribution in the GRT energy-momentum tensor is important over all phases of the expansion of the universe. They are thus acting identical to the way how dark matter acts and influences cosmic expansion. This means that the present-day claim for a dark matter contribution in cosmic expansion by Ω dark ≃ 0.23 can be substantially relaxed.

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The kinematic origin of the cosmological redshift

Cited by 61 publications

References 22 publications

On the nature of cosmological redshift and spectral shift in Schwarzschild-like and other spacetimes

On the nature of cosmological redshift and spectral shift in Schwarzschild-like and other spacetimes

Ambiguous red shifts

Retracted: New aspects of photon propagation in expanding universes

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