Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

What is the relation

  1. Jul 1, 2011 #1
    hi every body

    i have a question what is the relation bet relativity and the expansion of the universe

    and how einstine formed his cosmological condtant
  2. jcsd
  3. Jul 1, 2011 #2
    The relationship is that general relativity predicts a universe has to be either expanding or contracting. Holding perfectly still is like balancing a pencil on it's point - a slight change and it tips.

    The cosmological constant was added by Einstein in hope of a static Universe solution - the constant would keep the Universe from expanding or contracting, but the balancing act is incredibly difficult.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook