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Separate universes in loop quantum cosmology: framework and applications

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arxiv 1512.05743 v2 pith:EVVKYGIA submitted 2015-12-17 gr-qc

Edward Wilson-Ewing This is my paper · ORCID
classification gr-qc
keywords quantumcosmologyloopbounceequationstateapproachcosmological
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I present a streamlined review of how the separate universe approach to cosmological perturbation theory can be used to study the dynamics of long-wavelength scalar perturbations in loop quantum cosmology, and then use it to calculate how long-wavelength curvature perturbations evolve across the loop quantum cosmology bounce assuming a constant equation of state. A similar calculation is possible for tensor modes using results from a complementary approach to cosmological perturbation theory in loop quantum cosmology based on an effective Hamiltonian constraint. An interesting result is that the tensor-to-scalar ratio can be suppressed or amplified by quantum gravity effects during the bounce, depending on the equation of state of the matter field dominating the dynamics. In particular, if the equation of state lies between -1/3 and 1, the value of the tensor-to-scalar ratio will be suppressed during the bounce, in some cases significantly.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Effects of the ekpyrotic mechanism on inflationary phase in loop quantum cosmologies

    gr-qc 2025-10 conditional novelty 5.0 of 10

    In LQC and mLQC-I, tuned ekpyrotic-plus-inflation potentials can yield w>1 at the bounce and at least 60 e-folds of post-bounce inflation.

  2. The primordial angular power spectrum from the alternative mass function in loop quantum cosmology

    gr-qc 2025-05 conditional novelty 5.0 of 10

    A new quantum-corrected mass function in loop quantum cosmology, with a free parameter xi, produces a wave-packet structure in the primordial power spectrum and matches the CMB angular spectrum best at xi = 0.2.

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