Investigating clustering dark energy with 3d weak cosmic shear

Abstract

As observational evidence increasingly consolidates the case for a cosmological constant being the source of the Universe's accelerated expansion, the question whether, and if so, how well, future experiments could detect deviations from this standard scenario is raised with urgency. Assuming a dark energy component different from a cosmological constant, the observable effects in general include gravitational clustering described by the fluid's (rest-frame) speed of sound. We employ 3d weak cosmic shear, a proposed method to take advantage of the full three-dimensional information inherent to the cosmic shear field, to explore the capability of future surveys to detect dark energy clustering and the signature of an enhanced amplitude of the matter power spectrum on large scales. For this purpose, we present adequate numerical methods facilitating 3d weak cosmic shear calculations. We find that the possible constraints heavily depend on the dark energy equation of state w. If w is not very close to -1, constraining the squared sound speed within an order of magnitude seems possible with a combination of Euclid and Planck data.

11 pages, 7 figures; improved parameterisation of the gravitational potential, minor changes and clarifications

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Cited by in corpus (14)

• 3D Cosmic Shear: Cosmology from CFHTLenS
• Testing (modified) gravity with 3D and tomographic cosmic shear
• Preparing for the Cosmic Shear Data Flood: Optimal Data Extraction and Simulation Requirements for Stage IV Dark Energy Experiments
• Investigating scalar-tensor-gravity with statistics of the cosmic large-scale structure
• Nonlinear cosmological consistency relations and effective matter stresses
• A short review on clustering dark energy
• Intrinsic alignments and 3d weak gravitational lensing
• Extracting the late-time kinetic Sunyaev-Zel'dovich effect
• Combined constraints on deviations of dark energy from an ideal fluid from Euclid and Planck
• The cross-correlation between 3d cosmic shear and the integrated Sachs-Wolfe effect
• 3D cosmic shear: numerical challenges, 3D lensing random fields generation and Minkowski Functionals for cosmological inference
• Dark energy homogeneity in general relativity: Are we applying it correctly?
• Detecting baryon acoustic oscillations by 3d weak lensing
• Reconstructing the Thermal Sunyaev-Zel'dovich Effect in 3D