# Reconstruction of Dynamical Dark Energy Potentials: Quintessence, Tachyon and interacting models

## TL;DR

This paper develops methods to reconstruct dark energy potentials for various dynamical models, enabling differentiation of models with identical expansion histories by analyzing perturbations beyond smooth cosmology.

## Contribution

It provides closed-form and quadrature-based reconstruction techniques for dark energy potentials in tachyon, quintessence, and interacting models, applicable to arbitrary w(z).

## Key findings

- Reconstruction formulas for dark energy potentials derived.
- Applicable to constant w and CPL parameterization.
- Method generalizes to any w(z) form.

## Abstract

Dynamical models for dark energy are an alternative to the cosmological constant. It is important to investigate properties of perturbations in these models and go beyond the smooth FRLW cosmology. This allows us to distinguish different dark energy models with the same expansion history. For this, one often needs the potential for a particular expansion history. We study how such potentials can be reconstructed obtaining closed formulae for potential or reducing the problem to quadrature. We consider three classes of models here: tachyons, quintessence, and, interacting dark energy. We present results for constant w and the CPL parameterization. The method given here can be generalized to any arbitrary form of w(z).