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steady-state theory
steady-state theory A cosmological model of a universe which is expanding but has the same density at all times due to the continuous creation of matter. The steady-state theory is based on the perfect cosmological principle, which requires the universe to be the same at all times, as well as in all places. The mathematical solution of the equations of general relativity that results from this principle is the de Sitter universe. For many years the steady-state theory was a rival to the Big Bang theory, but it has fallen out of favour because it is inconsistent with the observed properties of the cosmic microwave background and cannot explain the evolution in the appearance of our Universe with time. Unlike the Big Bang theory, the steady-state theory has no initial singularity and does not require the existence of a primordial fireball phase. It was put forward in 1948 by H.Bondi, T.Gold, and F.Hoyle.
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"steady-state theory." A Dictionary of Astronomy. 1997. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "steady-state theory." A Dictionary of Astronomy. 1997. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O80-steadystatetheory.html "steady-state theory." A Dictionary of Astronomy. 1997. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-steadystatetheory.html |
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steady-state theory
steady-state theory Cosmological theory proposed (1948) by Austrian astronomers Hermann Bondi and Thomas Gold, and further developed by Fred Hoyle and others. According to this theory, the Universe has always existed; it had no beginning and will continue forever. Although the universe is expanding, it maintains its average density – steady-state – through the continuous creation of new matter. Most cosmologists now reject the theory because it cannot explain background radiation or the observation that the appearance of the universe changes with time.
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"steady-state theory." World Encyclopedia. 2005. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "steady-state theory." World Encyclopedia. 2005. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O142-steadystatetheory.html "steady-state theory." World Encyclopedia. 2005. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O142-steadystatetheory.html |
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steady-state theory
steady-state theory see cosmology . |
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"steady-state theory." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>. "steady-state theory." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1E1-X-steadyst.html "steady-state theory." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-X-steadyst.html |
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