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- Thread starter mertcan
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- #2

Bandersnatch

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Presence of dark matter causes the expansion to accelerate, and if it's in the form of a cosmological constant, this acceleration is constant.

Models with changing dark matter result in acceleration of acceleration of the expansion.

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I would like to add that as far as I know we add cosmological constant to ensure the derivative of energy tensor equals zero. I mean, if cosmological constant (even if the dark matter result in it) is constant, then Does not the derivative of energy tensor equal zero????? ( static universe )

Presence of dark matter causes the expansion to accelerate, and if it's in the form of a cosmological constant, this acceleration is constant.

Models with changing dark matter result in acceleration of acceleration of the expansion.

- #4

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Presence of dark matter causes the expansion to accelerate

No, the presence of dark

Because they say both the our universe is expanding and data they had acquired resembled the cosmological constant (static universe, net total energy is constant).

Einstein's introduction of the cosmological constant was to get a static universe. However, this only occurs for a very particular value for the cosmological constant and the solution is anyway unstable. There is no contradiction in having a cosmological constant and an expanding universe.

- #5

Bandersnatch

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A slip of mind. An embarrassing one nonetheless.No, the presence of darkenergycauses acceleration

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