Skip to Main content Skip to Navigation
Journal articles

Negative cosmological constant in the dark sector?

Abstract : 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.
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-03184607
Contributor : L2c Aigle <>
Submitted on : Monday, March 29, 2021 - 4:23:15 PM
Last modification on : Tuesday, March 30, 2021 - 3:35:19 AM

Links full text

Identifiers

Collections

Citation

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

Share

Metrics

Record views

13