Theoretical priors and the dark energy equation of state

Ido Ben-Dayan, Utkarsh Kumar

Research output: Contribution to journalArticlepeer-review


We revisit the theoretical priors used for inferring Dark Energy (DE) parameters. Any DE model must have some form of a tracker mechanism such that it behaved as matter or radiation in the past. Otherwise, the model is fine-tuned. We construct a model-independent parametrization that takes this prior into account and allows for a relatively sudden transition between radiation/matter to DE behavior. We match the parametrization with current data, and deduce that the adiabatic and effective sound speeds of DE play an important role in inferring the cosmological parameters. We find that there is a preferred transition redshift of 1+z≃29-30, and some reduction in the Hubble and Large Scale Structure tensions.

Original languageEnglish
Article number167
JournalEuropean Physical Journal C
Issue number2
StatePublished - Feb 2024


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