Difference between revisions of "Redshift"

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== Support for the Big Bang theory ==
 
== Support for the Big Bang theory ==
  
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The Hubble redshift in atomic spectra of distance cosmic objects, discovered by Edwin Hubble around 1929, is claimed as a source of evidence for the [[Big Bang theory]].<ref>Edwin Hubble (1929). [http://www.pnas.org/cgi/reprint/15/3/168/ "A relation between distance and radial velocity among extra-galactic nebulae"]. Proceedings of the National Academy of Sciences 15: 168–173.</ref> The redshift, the expanded wavelength of light, suggests that these objects are moving away from Earth due to the expansion of the universe. It also suggests either that the universe is undergoing accelerating expansion for an unknown reason<ref>
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The Hubble redshift in atomic spectra of distance cosmic objects, discovered by Edwin Hubble around 1929, is claimed as a source of evidence for the [[Big Bang theory]].<ref>Edwin Hubble (1929). [http://www.pnas.org/cgi/reprint/15/3/168/ "A relation between distance and radial velocity among extra-galactic nebulae"]. Proceedings of the National Academy of Sciences 15: 168–173.</ref> The redshift, the expanded wavelength of light, suggests that these objects are moving away from Earth due to the expansion of the universe. It also suggests that the universe is undergoing accelerating expansion for an unknown reason.
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The reason was proposed in 1985 as the time running slower in deep space galaxis than in our Galaxy from which the those deep space galaxies are observed, due to the coupling between the [[time dilation]] and the [[curvature of space]]. The effect has been confirmed with accuracy to one standard deviation by Supernova Cosmology Project team of astronomers, whose observations produced the relation
 
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:<math>dH/dt=-H_o^2/2</math>,
 
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where <math>dH/dt</math> is apparent acceleration of expansion of space, and <math>H_o</math> is [[Hubble constant]].
 
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</ref>, or that there exists [[Hubble time dilation]] causing such an effect in stationary [[Einstein's universe]]. The latter effect is expected by observational predictions of [[Einsteinian gravitation]]. It also complies with the [[perfect cosmological principle]].
 
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This is a phenomenon predicted by the Big Bang theory.
 
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==Redshift according to perfect cosmological principle and "[[gravitation demystified]]"==
 
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According to the [[Perfect cosmological principle]] that says that the universe looks everywhere and always approximately the same the redshift is a feature of [[curvature of space]] which in general relativity theory is coupled to the rate of time. As a result we see the more redshift the farther we look since the space is also more curved the farther we look. The exact relation between the [[curvature of space]] and rate of flow of time is
 
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:<math>d \tau/dt=exp(-r/R_s)</math>,
 
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where <math>\tau</math> is time in observed deep space (proper time of that place), <math>t</math> is time of observer, <math>r</math> is distance from observer to the observed point in deep space, and <math>R_s</math> is radius of curvature of space <ref>See derivation in [[Gravitation demystified]]</ref>.
 
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According to this principle the universe looking always approximately the same is neither expanding nor contracting and existed always and therefore was never created. Furthermore because of such relation between redshift and the distance the universe looks as if it was expanding with accelerating expansion which was noticed in 1998.
 
  
 
[[Category: Astronomy]]
 
[[Category: Astronomy]]
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==References==
 
==References==
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<references/>
 
<references/>
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[[Category:Astronomy]]
 
[[Category:Astronomy]]

Revision as of 14:54, September 28, 2011

The redshift of a given object is a measure of the amount that the wavelength of its emitted or reflected electromagnetic radiation has increased. This increase in wavelength is due to the relative motion of a source with respect to an observer; a light emitting source moving away from an observer will have its spectrum shifted toward longer (in optical light, redder) wavelengths. In practice this is analogous to the Doppler shifting of sound waves emitted from a moving source. Light emitted from a source moving towards an observer will experience a blueshift. In the case of redshift, however, most of the redshift is believed to be due not to the object moving through space, but to the expansion of space itself.

Support for the Big Bang theory

The Hubble redshift in atomic spectra of distance cosmic objects, discovered by Edwin Hubble around 1929, is claimed as a source of evidence for the Big Bang theory.[1] The redshift, the expanded wavelength of light, suggests that these objects are moving away from Earth due to the expansion of the universe. It also suggests that the universe is undergoing accelerating expansion for an unknown reason.

References

  1. ↑ Edwin Hubble (1929). "A relation between distance and radial velocity among extra-galactic nebulae". Proceedings of the National Academy of Sciences 15: 168–173.
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