How Does the Cosmological Constant Differ from Quintessence

question 204

Multiple Choice

How does the cosmological constant differ from quintessence?

• A) The cosmological constant is a specific physical effect that can be described mathematically, whereas quintessence is the total of all indefinable properties that make the universe what it is at any given time.
• B) The cosmological constant provides an accelerating force in the universal expansion, whereas quintessence provides a decelerating term; it is the balance between the cosmological constant and quintessence that determines whether the expansion accelerates or decelerates.
• C) There is essentially no difference; basically, quintessence is the modern name for the cosmological constant.
• D) The cosmological constant provides a constant accelerating force in the universal expansion, whereas quintessence can change as the expansion proceeds.

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