Unifying inflation with LambdaCDM epoch in modified f(R) gravity consistent with Solar System tests

TL;DR

This paper proposes modified gravity models that unify early inflation and late cosmic acceleration, are consistent with local tests, and avoid classical instabilities, offering a promising alternative to standard cosmology.

Contribution

The paper introduces specific f(R) and F(G) gravity models that unify inflation and acceleration while satisfying Solar System constraints and stability conditions.

Findings

Models are consistent with local tests and cosmological bounds.

Classical instabilities are absent in the proposed models.

Newtonian gravity law is preserved in these theories.

Abstract

We suggest two realistic f(R) and one F(G) modified gravities which are consistent with local tests and cosmological bounds. The typical property of such theories is the presence of the effective cosmological constant epochs in such a way that early-time inflation and late-time cosmic acceleration are naturally unified within single model. It is shown that classical instability does not appear here and Newton law is respected. Some discussion of possible anti-gravity regime appearence and related modification of the theory is done.