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Cosmological constant - Wikipedia, the free encyclopedia (535 words) |
 | Because the cosmological constant has negative pressure, according to general relativity a positive cosmological constant--which means empty space has positive energy--causes the expansion of empty space to accelerate (see dark energy for details). |
| Ironically, the cosmological constant is still of interest, as observations made in the late 1990's of distance-redshift relations indicate that the universe is accelerating. |
| This is the cosmological constant problem, the worst problem of fine-tuning in physics: there is no known natural way to derive the infinitesimal cosmological constant observed in cosmology from particle physics. |
| Cosmological argument - Wikipedia, the free encyclopedia (2140 words) |
| Currently, the theory of the cosmological history of the universe most widely accepted by astronomers arguably includes an apparent first event—the Big Bang—the immense explosion of all known matter and energy from a superdense point at some finite time in the past. |
| According to the cosmological argument, the cause of the first event would necessarily be a being which is capable of causing other events, but which is not itself caused. |
| Though contemporary versions of the cosmological argument assume that there was a beginning to this chain of causes, Aquinas' formulation did not make such an assumption, due to his view that it was impossible to prove that the universe did have a beginning. |
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