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How does dark energy affect the expansion of the universe?

Answer 1

It accelarates it.

That is precisely how we discovered that the universe is expanding faster than we can imagine, as measured by the Hubble-diagram. Since the gravitational attraction between normal objects cannot be explained, we assume that there must be some other force, perhaps dark energy, that we are unaware of but that is responsible for the universe's acceleration.

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Answer 2

Olivia Aldridge

By applying negative pressure, dark energy causes space to expand faster and faster, speeding up the expansion of the universe.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.