Dark energy

From: P T (Petepenguin_at_webtv.net)
Date: 02/27/05 

Date: Sun, 27 Feb 2005 09:57:01 -0600

Does the postulation of Dark Energy (unknown factor causing acceleration
of the universe)
negate the need for the concept of Dark Matter (unknown factor
preventing the universe from expanding infinitely)?

Do I have these concepts approximately correct?

Does anyone have any reasonable explanation for the DE factor?

Does the acceleration of the universe require a paradigm shift in our
theories?

Thanks
Novice Pete

Relevant Pages

  • Re: Dark energy
    ... > Does the postulation of Dark Energy (unknown factor causing acceleration ... > negate the need for the concept of Dark Matter (unknown factor ... > preventing the universe from expanding infinitely)? ...
    (sci.astro)
  • Re: Dark energy
    ... > Does the postulation of Dark Energy (unknown factor causing acceleration ... > negate the need for the concept of Dark Matter (unknown factor ... > preventing the universe from expanding infinitely)? ... Dark energy doesn't appear to be significant ...
    (sci.astro)
  • Re: Dont like the truth? Lie.
    ... A Quintessential Introduction to Dark Energy ... "Most of the energy in the universe is not gravitationally attractive. ... We are probably the last generation to have been taught that gravity ... Visible matter comes nowhere close to closing the Universe. ...
    (sci.space.policy)
  • Re: http://sciencenow.sciencemag.org/cgi/content/full/2008/801/3
    ... Astronomers have taken another significant step toward proving the existence of dark energy, the mysterious force that seems to be stretching the cosmos at an accelerating rate. ... They planned to do so by carefully calibrating the brightness of a well-studied type of supernova in very distant galaxies. ... But by 1998, the team had reached a stunningly different conclusion: The expansion of the universe was not slowing down--it was accelerating, driven by some unknown effect that came to be called dark energy. ... To conduct the new study, the Hawaiian team, led by astronomer Istvan Szapudi, combined two large-scale observations of the cosmos that already had been completed: the cosmic microwave background, which represents the last, dying embers of the big bang, and the Sloan Digital Sky Survey, which comprises images of millions of galaxies. ...
    (sci.physics)
  • String theorist explores dark energy and our unique pocket of the universe (Forwarded)
    ... "There's no question that there are many things about the [universe] which if they were very much different, even just a little bit different, life couldn't exist, intelligent life couldn't exist," said Stanford physics Professor Leonard Susskind, who is currently on sabbatical and writing a popular book titled The ... Dark energy -- a mysterious force that causes matter to accelerate away from other matter -- is a case in point. ... While we observe three dimensions of space and one of time, string theory posits 10 dimensions of space and one of time. ...
    (sci.astro)