
TL;DR
This paper proposes a unified gravitational model incorporating local and non-local corrections to explain the universe's evolution from inflation to dark energy-driven acceleration without scalar fields.
Contribution
It introduces a combined local and non-local gravity model that naturally transitions through key cosmic epochs, unifying inflation and dark energy within a single framework.
Findings
The model achieves a graceful exit from inflation via oscillations.
Late-time acceleration is driven by the non-local term.
Both terms are derived from covariant effective field theory.
Abstract
We present a unified evolution of the universe from very early times until the present epoch by including both the leading local correction and the leading non-local term to the classical gravitational action. We find that the inflationary phase driven by term gracefully exits in a transitory regime characterized by coherent oscillations of the Hubble parameter. The universe then naturally enters into a radiation dominated epoch followed by a matter dominated era. At sufficiently late times after radiation-matter equality, the non-local term starts to dominate inducing an accelerated expansion of the universe at the present epoch. We further exhibit the fact that both the leading local and non-local terms can be obtained within the covariant effective field theory of gravity. This scenario thus provides a unified picture of inflation and dark energy…
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