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Einstein included the cosmological constant to make the universe static. Dark energy makes the universe expand accelerating. So in the 2 models the cosmological constant explains 2 different things. How is that possible?

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- Thread starter LSulayman
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- #1

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Einstein included the cosmological constant to make the universe static. Dark energy makes the universe expand accelerating. So in the 2 models the cosmological constant explains 2 different things. How is that possible?

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Nabeshin

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So, when we refer to a "positive" cosmological constant, this means it is greater than Einstein's original value, where a value smaller than Einstein's would be considered negative?

And, this may seem like a novel question, but when we empirically measure the cosmological constant, what is actually measured?

Is calculating the cosmological constant, on a basic level, taking the current expansion rate and figuring the gravitational attraction of everything and seeing if the expansion will decelerate with gravity or if it will speed up?

And another question, if anyone can answer it. If we assume the current rate of expansion--ignoring the supernova data--what value for the cosmological constant would we need to have the universe eventually stop expanding and contract?

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