Cosmic Growth and Expansion Conjoined

Abstract

Cosmological measurements of both the expansion history and growth history have matured, and the two together provide an important test of general relativity. We consider their joint evolutionary track, showing that this has advantages in distinguishing cosmologies relative to considering them individually or at isolated redshifts. In particular, the joint comparison relaxes the shape degeneracy that makes $f{\sigma }_8(z)$ curves difficult to separate from the overall growth amplitude. The conjoined method further helps visualization of which combinations of redshift ranges provide the clearest discrimination. We examine standard dark energy cosmologies, modified gravity, and "stuttering" growth, each showing distinct signatures.

6 pages, 6 figures

References in corpus (3)

• The 6dF Galaxy Velocity Survey: Cosmological constraints from the velocity power spectrum
• The WiggleZ Dark Energy Survey: measuring the cosmic growth rate with the two-point galaxy correlation function
• Cosmological Tests using Redshift Space Clustering in BOSS DR11

Cited by in corpus (6)

• Probing the imprints of generalized interacting dark energy on the growth of perturbations
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Machine Learning and cosmographic reconstructions of quintessence and the Swampland conjectures
• Revealing the non-adiabatic nature of dark energy perturbations from galaxy clustering data
• Geometric and growth rate tests of General Relativity with recovered linear cosmological perturbations
• New measures to test modified gravity cosmologies