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Linear density perturbations in multifield coupled quintessence

A. Leithes, K. A. Malik, D. J. Mulryne, N. J. Nunes

We study the behavior of linear perturbations in multifield coupled quintessence models. Using gauge-invariant linear cosmological perturbation theory we provide the full set of governing equations for this class of models, and solve the system numerically. We apply the numerical code to generate growth functions for various examples, and compare these both to the standard. cold dark matter model and to current and future observational bounds. Finally, we examine the applicability of the "small scale approximation" often used to calculate growth functions in quintessence models, in light of upcoming experiments such as SKA and Euclid. We find the deviation of the full equation results for large k modes from the approximation exceeds the experimental uncertainty for these future surveys. The numerical code, PYESSENCE, written in Python will be publicly available.

Astrophysics - Cosmology and Nongalactic Astrophysics, General Relativity and Quantum Cosmology

Physical Review D
Volume 95, Issue 12, Page 16
2017 June

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia