A novel early dark energy model

We present a theoretical study of an early dark energy (EDE) model. The equation state ?(z) evolves during the thermal history in framework Friedmann-Lemaitre-Robertson-Walker Universe, following effective parametrization that is function redshift z. explore evolution system from radiation domination era to late times, allowing EDE model have non-negligible contribution at high (as opposed cosmological constant only plays role once structure formed) with very little input Big Bang Nucleosynthesis, and do so, mimics behaviour, but being subdominant terms its density. At asymptotically tends fiducial value De Sitter epoch, providing explanation for accelerated expansion Universe emulating effect constant. proposed has three free parameters, we constrain using SNIa luminosity distances, along CMB shift parameter deceleration calculated time - matter equality. With full knowledge best fit our model, calculate different observables compare these predictions standard?CDM Besides general consent community constant, there no fundamental reason choose particular candidate as energy. Here, open opportunity consider more dynamical also accounts Universe.