Phantom scalar dark energy as modified gravity: Understanding the origin of the Big Rip singularity

F. Briscese, E. Elizalde, S. Nojiri, Sergei D. Odintsov

    Research output: Contribution to journalArticleResearchpeer-review

    214 Citations (Scopus)

    Abstract

    It is shown that phantom scalar models can be mapped into a mathematically equivalent, modified F (R) gravity, which turns out to be complex, in general. Only for even scalar potentials is the ensuing modified gravity real. It is also demonstrated that, even in this case, modified gravity becomes complex at the region where the original phantom dark energy theory develops a Big Rip singularity. A number of explicit examples are presented which show that these two theories are not completely equivalent, from the physical viewpoint. This basically owes to the fact that the physical metric in both theories differ in a time-dependent conformal factor. As a result, an FRW accelerating solution, or FRW instanton, in the scalar-tensor theory may look as a decelerating FRW solution, or a non-instantonic one, in the corresponding modified gravity theory. © 2007 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)105-111
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume646
    Issue number2-3
    DOIs
    Publication statusPublished - 8 Mar 2007

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