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The AstronomersFred Adams: Expanding Universe Conference (
Fred Adams: Expanding Universe Conference (
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Title: The FUTURE History of Cosmic Expansion (and constituent astrophysical objects) Abstract: The discovery of the cosmic expansion had a profound influence on our understanding of the past history of the universe. This talk outlines the future history of the cosmos as it continues to expand: we consider the evolution of planets, stars, galaxies, and the universe itself over time scales that greatly exceed the current cosmic age. The discussion starts with the effects of accelerated cosmic expansion, which causes every galaxy cluster to become its own island universe. Within these bound structure, the lowest mass stars continue to burn hydrogen over much longer times, and evolve off the main-sequence near the epoch when conventional star formation ends. The stellar population is thus converted into degenerate remnants -- neutron stars, white dwarfs, and brown dwarfs. Although the supply of interstellar gas grows depleted, star formation continues at an attenuated rate through brown dwarf collisions. As the galaxy evaporates via dynamical relaxation, dark matter particles are accreted by white dwarfs, where they annihilate and keep the stellar remnants relatively warm. Over longer time scales, the degenerate objects evolve and sublimate through the decay of their constituent nucleons. When the white dwarfs and neutron stars disappear, black holes are the brightest astrophysical objects, slowly losing their mass as they emit Hawking radiation. After the largest black holes have evaporated, the universe slowly slides into darkness.
Added on Nov 27, 2012 by lonewolf
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Time: 36:51 | Views: 998 | Comments: 0
  Extragalactic astronomy  
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