Classical and quantum $f(R)$ cosmology: The big rip, the little rip and the little sibling of the big rip

Abstract

The big rip, the little rip and the little sibling of the big rip are cosmological doomsdays predicted by some phantom dark energy models that could describe the future evolution of our Universe. When the universe evolves towards either of these future cosmic events all bounded structures and, ultimately, space-time itself are ripped apart. Nevertheless, it is commonly belief that quantum gravity effects may smooth or even avoid these classically predicted singularities. In this review, we discuss the classical and quantum occurrence of these riplike events in the scheme of metric $f(R)$ theories of gravity. The quantum analysis is performed in the framework of $f(R)$ quantum geometrodynamics. In this context, we analyse the fulfilment of the DeWitt criterion for the avoidance of these singular fates.

Invited review submitted to Universe for the Special Issue on "Quantum Cosmology", ed. by Prof. Paulo Vargas Moniz, 32 pages, 3 tables. v2: typos fixed, references added, matches published version

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• Exact $(1+3+6)$-dimensional cosmological-type solutions in gravitational model with Yang-Mills field, Gauss-Bonnet term and $\Lambda$-term
• Game Theory in Cosmology
• Supersymmetric higher-derivative models in quantum cosmology
• A Spectrum of Cosmological Rips and Their Observational Signatures