The Self-consistent Matter Coupling of a Class of Minimally Modified Gravity Theories

Understand

The self-consistent matter coupling is found in a broad class of minimally modified gravity theories which was discovered recently.

• All constraints in the theories remain first class and thus a graviton has only 2 local degrees of freedom.
• The cosmological solution of one of the examples in this class, the so-called square root gravity, exhibits a singularity freeness at high energy limit.
• At low energy limit, the theory smoothly connects to GR.