Negative cosmological constant in the dark sector? - Archive ouverte HAL Access content directly
Journal Articles Physical Review D Year : 2021

Negative cosmological constant in the dark sector?

Rodrigo Calderon
  • Function : Author
  • PersonId : 1094749
Radouane Gannouji
  • Function : Author
Benjamin L'Huillier
  • Function : Author
David Polarski
  • Function : Author
  • PersonId : 1042816


We consider the possibility that the dark sector of our Universe contains a negative cosmological constant dubbed λ. For such models to be viable, the dark sector should contain an additional component responsible for the late-time accelerated expansion rate (X). We explore the departure of the expansion history of these models from the concordanceΛ cold dark matter (ΛCDM) model. For a large class of our models, the accelerated expansion is transient with a nontrivial dependence on the model parameters. All models with wX>−1 will eventually contract and we derive an analytical expression for the scale factor a(t) in the neighborhood of its maximal value. We find also the scale factor for models ending in a Big Rip in the regime where dustlike matter density is negligible compared to λ. We address further the viability of such models, in particular when a high H0 is taken into account. While we find no decisive evidence for a nonzero λ, the best models are obtained with a phantom behavior on redshifts z≳1 with a higher evidence for nonzero λ. An observed value for h substantially higher than 0.70 would be a decisive test of their viability.

Dates and versions

hal-03184607 , version 1 (29-03-2021)



Rodrigo Calderon, Radouane Gannouji, Benjamin L'Huillier, David Polarski. Negative cosmological constant in the dark sector?. Physical Review D, 2021, 103 (2), pp.023526. ⟨10.1103/PhysRevD.103.023526⟩. ⟨hal-03184607⟩
23 View
0 Download



Gmail Facebook Twitter LinkedIn More