A Separate Universe Approach to Quintessence Perturbations

Abstract

There is some observational evidence that the dark energy may not be smooth on large scales. This makes it worth while to try and get as simple and as intuitive a picture of how dark energy perturbations behave so as to be able to better constrain possible models of dark energy and the generation of large scale perturbations. The separate Universe method provides an easy way to evaluate cosmological perturbations, as all that is required is an understanding of the background behavior. Here, this method is used to show how the size of the dark energy perturbations, preferred by observations, is larger than would be expected, and so some mechanism may be required to amplify them.

11 pages. v2: References added

References in corpus (3)

• A Low CMB Quadrupole from Dark Energy Isocurvature Perturbations
• Adiabatic and entropy perturbations with interacting fluids and fields
• The Amplitude of Dark Energy Perturbations

Cited by in corpus (6)

• On the Growth of Perturbations as a Test of Dark Energy
• Scalar Field Dark Energy Perturbations and their Scale Dependence
• A comparison of perturbations in fluid and scalar field models of dark energy
• The Amplitude of Dark Energy Perturbations
• Evolution of perturbations in distinct classes of canonical scalar field models of dark energy
• Scalar field dark energy perturbations and the Integrated Sachs Wolfe effect