Disformal symmetry in the Universe: mimetic gravity and beyond

Understand

Symmetries play an important role in fundamental physics.

• In gravity and field theories, particular attention has been paid to Weyl (or conformal) symmetry.
• However, once the theory contains a scalar field, conformal transformations of the metric can be considered a subclass of a more general type of transformation, so-called disformal transformation.
• Here, we investigate the implications of pure disformal symmetry in the Universe.