http://arxiv.org/abs/1706.01706
We test the viability of a single fluid cosmological model containing a transition from a DM-like regime to a DE-like regime. The fluid is a k-essence scalar field with a well defined Lagrangian. We constrain its model parameters with a combination of geometric probes and conclude that the evidence for this model is similar to the evidence for $\Lambda$CDM. In addition, we find a lower bound for the rapidity of the transition, implying that fast transitions are favored with respect to slow ones even at background level.
I. Leanizbarrutia, A. Rozas-Fernandez and I. Tereno
Wed, 7 Jun 17
17/52
Comments: 12 pages, 4 figures