# Supplying Dark Energy from Scalar Field Dark Matter

## TL;DR

This paper proposes a unified model where ultra-light scalar particles form Bose-Einstein condensates that account for both dark matter at galactic scales and dark energy at larger scales, using solutions to the Klein-Gordon equation.

## Contribution

It introduces a scalar field model with minimal parameters that simultaneously explains dark matter and dark energy through solutions of the Klein-Gordon equation.

## Key findings

- Scalar field solutions form Bose-Einstein condensates as dark matter.
- Constant solutions at large scales can explain dark energy.
- Model uses only mass and self-coupling parameters.

## Abstract

We consider the hypothesis that dark matter and dark energy consists of ultra-light self-interacting scalar particles. It is found that the Klein-Gordon equation with only two free parameters (mass and self-coupling) on a Schwarzschild background, at the galactic length-scales has the solution which corresponds to Bose-Einstein condensate, behaving as dark matter, while the constant solution at supra-galactic scales can explain dark energy.