【摘要】：正 Recently,Cai and Su [Phys.Rev.D 81 (2010)103514]found that the sign of interaction Q in'the darksector changed in the approximate redshift range of 0.45 ≤,z ≤ 0.9,by using a model-independent method to deal withthe observational data.In fact,this result raises a remarkable problem,since most of the familiar interactions cannotchange their signs in the whole cosmic history.Motivated by the work of Cai and Su,we have proposed a new type ofinteraction in a previous work [H.Wei,Nucl.Phys.B 845 (2011)381].The key ingredient is the deceleration parameterq in the interaction Q,and hence the interaction Q can change its sign when our universe changes from deceieration(q 0)to acceleration (q 0).In the present work,we consider the cosmological constraints on this new type ofsign-changeable interactions,by using the latest observational data.We find that the cosmological constraints on themodel parameters are fairly tight.In particular,the key parameter β can be constrained to a narrow range.
[Abstract]:Positive recent and Su [Phys.Rev.D 81 (2010) 103514] found that the sign of interaction Q in'the darksector changed in the approximate redshift range of 0.45 鈮，

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