“steady-state theory”的概念、定义、翻译、参考文献-科学参考

steady-state theory

Physics

The cosmological theory that the universe has always existed in a steady state, that it had no beginning, will have no end, and has a constant mean density. To compensate for the observed expansion of the universe this theory postulates that matter is created throughout the universe at a rate of about 10⁻¹⁰ nucleon per metre cubed per year as a property of space. Because it has failed to account for the microwave background radiation or the evidence of evolution in the universe it has lost favour to the big-bang theory. It was first proposed by Sir Hermann Bondi (1919–2005), Thomas Gold (1920–2004), and Fred Hoyle in 1948.

Astronomy

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.

单词	steady-state theory
释义	steady-state theory Physics The cosmological theory that the universe has always existed in a steady state, that it had no beginning, will have no end, and has a constant mean density. To compensate for the observed expansion of the universe this theory postulates that matter is created throughout the universe at a rate of about 10⁻¹⁰ nucleon per metre cubed per year as a property of space. Because it has failed to account for the microwave background radiation or the evidence of evolution in the universe it has lost favour to the big-bang theory. It was first proposed by Sir Hermann Bondi (1919–2005), Thomas Gold (1920–2004), and Fred Hoyle in 1948. Astronomy 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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