Compensating the excess growth of structure in the Open Dark Fluid model

Investigate whether incorporating additional physical effects—such as stochastic noise, further operators in the open effective action, or refined baryonic physics—can compensate the model’s predicted enhancement of late-time structure growth (e.g., D(a) and fσ8) and restore agreement with current observational constraints.

Background

The minimal Open Dark Fluid (ODF) realization studied by the authors predicts an enhancement of structure formation relative to ΛCDM, which places the simplest scenario outside current observational bounds.

The authors point out that additional physical ingredients could alter growth predictions. Determining whether such effects can offset the enhancement is left as a concrete task for future work.