# A model of interacting dark fluids tested with supernovae and Baryon Acoustic Oscillations data

## TL;DR

This paper tests a cosmological model of interacting dark matter and dark energy derived from Einstein-Cartan gravity against supernovae and BAO data, finding it a viable alternative to the standard Lambda-CDM model.

## Contribution

It introduces a new interacting dark fluid model based on Einstein-Cartan gravity and constrains its parameters using observational data, comparing it with Lambda-CDM.

## Key findings

- The model fits the data with a competitive chi-squared value.
- Tight constraints are placed on the interaction parameters.
- The model offers a plausible alternative to Lambda-CDM.

## Abstract

We compare supernovae and Baryon Acoustic Oscillations data to the predictions of a cosmological model of interacting dark matter and dark energy. This theoretical model can be derived from the effective field theory of Einstein-Cartan gravity with two scaling exponents $\delta_G$ and $\delta_{\Lambda}$, related to the interaction between dark matter and dark energy. We perform a $\chi^2$ fit to the data to compare and contrast it with the standard $\Lambda$CDM model. We then explore the range of parameter of the model which gives a better $\chi^2$ than the standard cosmological model. All those results lead to tight constraints on the scaling exponents of the model. Our conclusion is that this class of models, provides a decent alternative to the $\Lambda$CDM model.