Towards Viable Cosmological Models of Disformal Theories of Gravity

Understand

The late-time cosmological dynamics of disformal gravity are investigated using dynamical systems methods.

• It is shown that in the general case there are no stable attractors that screen fifth-forces locally and simultaneously describe a dark energy dominated universe.
• Viable scenarios have late-time properties that are independent of the disformal parameters and are identical to the equivalent conformal quintessence model.
• Our analysis reveals that configurations where the Jordan frame metric becomes singular are only reached in the infinite future, thus explaining the natural pathology resistance observed numerically by several previous works.