The solution of the cosmological constant problem from the inhomogeneous equation of state - a hint from modified gravity?

Understand

The cosmological constant problem is studied in a two component cosmological model.

• The universe contains a cosmological constant of an arbitrary size and sign and an additional component with an inhomogeneous equation of state.
• It is shown that, in a proper parameter regime, the expansion of the universe with a large absolute value of the cosmological constant may asymptotically tend to de Sitter space corresponding to a small effective positive cosmological constant.
• It is argued that such a behavior can be regarded as a solution of the cosmological constant problem in this model.