Comparison between two scalar field models using rotation curves of spiral galaxies

Understand

Scalar fields have been used as candidates for dark matter in the universe, from axions with masses $\sim10^{-5}$eV until ultra-light scalar fields with masses $\sim10^{-22}$eV.

• Axions behave as cold dark matter while the ultra-light scalar fields galaxies are Bose-Einstein condensate drops.
• The ultra-light scalar fields are also called scalar field dark matter model.
• In this work we study rotation curves for low surface brightness spiral galaxies using two scalar field models: the Gross-Pitaevskii Bose-Einstein condensate in the Thomas-Fermi approximation and a scalar field solution of the Klein-Gordon equation.