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Cosmological Constraints on the Sign-Changeable Interactions · Around

2010

Cosmological Constraints on the Sign-Changeable Interactions

Wei, Hao

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Recently, Cai and Su [Phys.

Rev.
D {\bf 81}, 103514 (2010)] found that the sign of interaction $Q$ in the dark sector changed in the approximate redshift range of $0.45\,\lsim\, z\,\lsim\, 0.9$, by using a model-independent method to deal with the observational data.
In fact, this result raises a remarkable problem, since most of the familiar interactions cannot change their signs in the whole cosmic history.

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