What Is an Advantage of Quintessence Over the Cosmological Constant

question 113

Multiple Choice

What is an advantage of quintessence over the cosmological constant as a description of dark energy?

• A) Einstein's reasoning in rejecting the cosmological constant still seems to be true today.
• B) The cosmological constant would have to have, from the beginning of the universe, the right value to give a flat universe now: an amazing coincidence. The quintessence model does not have this requirement.
• C) Quintessence is a well-established concept in physics, going back to ancient times, whereas the cosmological constant is a relatively new and untested concept.
• D) The quintessence model predicts the correct age for the universe; the cosmological constant does not.

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