Singularities in loop quantum cosmology

T. Cailleteau, Antonio Cardoso, K. Vandersloot, David Wands

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We show that simple scalar field models can give rise to curvature singularities in the effective Friedmann dynamics of Loop Quantum Cosmology (LQC). We find singular solutions for spatially flat Friedmann-Robertson-Walker cosmologies with a canonical scalar field and a negative exponential potential, or with a phantom scalar field and a positive potential. While LQC avoids big bang or big rip type singularities, we find sudden singularities where the Hubble rate is bounded, but the Ricci curvature scalar diverges. We conclude that the effective equations of LQC are not in themselves sufficient to avoid the occurrence of curvature singularities.
Original languageEnglish
Pages (from-to)251302
Number of pages1
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 17 Dec 2008


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