Which of the following statements about dark energy is false? a. Dark energy is

Question

Which of the following statements about dark energy is false? a. Dark energy is thought to contribute about 73% to the total density parameter of the Universe. b. Dark energy is thought to be the primary driver of the current expansion of the Universe c. The combined contributions of matter and dark energy to the density parameter imply a critically-dense Universe. d. Expansion of the Universe due to dark energy was hypothesised in order to solve the ‘horizon problem’ in the comic microwave background.

Explanation / Answer

d. Expansion of the Universe due to dark energy was hypothesised in order to solve the ‘horizon problem’ in the comic microwave background.

Horizon problem: The CMBR is essentially the same temperature in all directions.

The horizon problem is solved by inflation because regions that appear to be isolated from each other were in contact with each other before the inflation period. They came into equilibrium before inflation expanded them far away from each other. Another bonus is that the GUTs that predict inflation also predict an asymmetry between matter and antimatter, so that there should be an excess of matter over antimatter.

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