Density Perturbation Growth in Teleparallel Cosmology

Chao-Qiang Geng; Yi-Peng Wu

Density Perturbation Growth in Teleparallel Cosmology

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arxiv 1212.6214 v2 pith:DE4W5SFH submitted 2012-12-26 astro-ph.CO gr-qc

Chao-Qiang Geng , Yi-Peng Wu This is my paper · ORCID

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keywords cosmologyevolutionsfieldmodelsperturbationsteleparallelcosmologicalcoupling

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We study the cosmological perturbations in teleparallel dark energy models in which there is a dynamical scalar field with a non-minimal coupling to gravity. We find that the propagating degrees of freedom are the same as in quintessence cosmology despite that variables of the perturbed vierbein field are greater than those in metric theories. We numerically show some evident discrepancy from general relativity in the evolutions of the perturbations on all scales of the universe. We also demonstrate that the gravitational interactions are enhanced during the unique tracker evolutions in these models.

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Teleparallel dark energy in a nonflat universe
gr-qc 2025-05 conditional novelty 5.0 of 10

Nonflat teleparallel dark energy with a vanishing potential is statistically favored over Lambda CDM in the authors' MCMC fit and mildly prefers an open universe.

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