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A de Sitter universe (or de Sitter solution) is a term named after Willem de Sitter for a universe which follows the expansion law

where

is the scale factor is cosmological time.

A de Sitter universe is one with a positive cosmological constant and zero matter density.

There is no Big Bang in a de Sitter universe - expansion is self-similar from an infinite time in the past to an infinite time in the future.

The model has practical implications as an approximation during the future of the Universe when the cosmological constant is likely to dominate (assuming no changes from the present version of the standard Big Bang model), and during the early universe during a hypothesised period of inflation.

Topics: De Sitter Universe, Demographics Of Angola, Demographics Of...

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Delian LeagueThe Delian League was an association of Greek city-states in the 5th century BC. As it was led by Athens, it is sometimes pejoratively referred to as the Athenian Empire . In 478 BC, following the defeat of Xerxes' invasion of Greece, Pausanias the Sparta	Demographics of Bosnia and HerzegovinaPopulation 3,989,018 (July 2003 est. Age structure ''0-14 years 19. 4% (male 397,810; female 377,005) 15-64 years 70. 5% (male 1,439,383; female 1,372,891) 65 years and over 10. 1% (male 171,643; female 230,286) (2003 est. Median age ''total 35. 5 years m	Demographics of BotswanaBotswana, like many nations in southern Africa, suffers from a high AIDS infection rate, which was 38. 8% for adults in 2002. In 2003, the government began a comprehensive program involving free or cheap generic anti-retroviral drugs as well as an informa
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Topics: De Sitter Universe, Demographics Of Angola, Demographics Of...