Linear Density Perturbations in Multifield Coupled Quintessence

Abstract

We study the behaviour 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 $\Lambda$CDM 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.

arXiv comment19 pages, 9 figures, version accepted for publication by PRD, refs. added, extra Consistency Test section added

References in corpus (40)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Planck 2015 results. XIII. Cosmological parameters
• Efficient Computation of CMB anisotropies in closed FRW models
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples
• Coupled Quintessence
• Improved Cosmological Constraints from New, Old and Combined Supernova Datasets
• The SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Overview and Early Data
• Interacting Dark Matter and Dark Energy
• Assisted inflation
• The Atacama Cosmology Telescope: Cosmological Parameters from the 2008 Power Spectra
• Large-scale instability in interacting dark energy and dark matter fluids
• A Lower Growth Rate from Recent Redshift Space Distortion Measurements than Expected from Planck
• A field-theory motivated approach to symbolic computer algebra
• Cosmology from Cosmic Shear with DES Science Verification Data
• Self-similar cosmological solutions with a non-minimally coupled scalar field
• Redshift distributions of galaxies in the DES Science Verification shear catalogue and implications for weak lensing
• Angular Power Spectra of the Millimeter Wavelength Background Light from Dusty Star-forming Galaxies with the South Pole Telescope
• Growth of perturbations in dark matter coupled with quintessence
• Dynamics of Assisted Inflation
• On the Realization of Assisted Inflation
• Adiabatic and entropy perturbations with interacting fluids and fields
• Perturbations in a coupled scalar field cosmology
• Dynamics of Quintessence Models of Dark Energy with Exponential Coupling to the Dark Matter
• Models of quintessence coupled to the electromagnetic field and the cosmological evolution of alpha
• Extending cosmological tests of General Relativity with the Square Kilometre Array
• Quantum Field Theory of Interacting Dark Matter/Dark Energy: Dark Monodromies
• Scalar-Fluid theories: cosmological perturbations and large-scale structure
• New interactions in the dark sector mediated by dark energy
• Distinguishing interacting dark energy from wCDM with CMB, lensing, and baryon acoustic oscillation data
• Exacerbating the cosmological constant problem with interacting dark energy
• Assisted coupled quintessence
• Simulations of Quintessential Cold Dark Matter: beyond the cosmological constant
• Multiple Dark Matter as a self-regulating mechanism for dark sector interactions
• Linear Perturbation constraints on Multi-coupled Dark Energy
• Supernova constraints on Multi-coupled Dark Energy
• Measuring redshift-space distortions with future SKA surveys
• Euclid & SKA Synergies
• PYESSENCE - Generalised Coupled Quintessence Linear Perturbation Python Code - User Guide

Cited by in corpus (9)

• Multi-field dark energy: cosmic acceleration on a steep potential
• Mass varying neutrinos, symmetry breaking, and cosmic acceleration
• Kinetically coupled dark energy
• Cosmological dynamics of multifield dark energy
• Spherical collapse in coupled quintessence with a $\Lambda$CDM background
• Is there evidence for CIDER in the Universe?
• Quintom fields from chiral anisotropic cosmology
• The presence of a Phantom field in a Randall-Sundrum scenario
• Towards a de Sitter quintom-like cosmology from a reduction of a 7-dimensional $BF$ theory