The local Hubble flow: a manifestation of dark energy

Abstract

Our local environment at $r<10$ Mpc expands linearly and smoothly, as if ruled by a uniform matter distribution, while observations show the very clumpy local universe. This is a long standing enigma in cosmology. We argue that the recently discovered vacuum or quintessence (dark energy (DE) component with the equation of state $p_Q=w{\rho }_Q{c}^2$, $w\in [-1,0)$) from observations of the high-redshift universe may also manifest itself in the properties of the very local Hubble flow. We introduce the concept of the critical distance $r_Q$ where the repulsive force of dark energy starts to dominate over the gravity of a mass concentration. For the Local Group $r_Q$ is about 1.5 Mpc. Intriguingly, at the same distance 1.5 Mpc the linear and very "cold" Hubble flow emerges, with about the global Hubble constant. We also consider the critical epoch $t_Q$, when the DE antigravity began to dominate over the local matter gravity for a galaxy which at the present epoch is in the local DE dominated region. Our main result is that the homogeneous dark energy component, revealed by SNIa observations, resolves the old confrontation between the local Hubble flow and local highly non-uniform, fractal matter distribution. It explains why the Hubble law starts on the outskirts of the Local Group, with the same Hubble constant as globally and with a remarkably small velocity dispersion.

14 pages, LaTex, no figures

References in corpus (1)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant

Cited by in corpus (36)

• The Hubble Constant: A Summary of the HST Program for the Luminosity Calibration of Type Ia Supernovae by Means of Cepheids
• ACS imaging of 25 galaxies in nearby groups and in the field
• The very local Hubble flow
• The Hubble flow around the Local Group
• Local galaxy flows within 5 Mpc
• A dynamical model of the local cosmic expansion
• Light propagation in statistically homogeneous and isotropic universes with general matter content
• Evaluating backreaction with the peak model of structure formation
• The signature of dark energy on the local Hubble flow
• The quiescent Hubble flow, local dark energy tests, and pairwise velocity dispersion in a $\Omega =1$ universe
• Astrophysical Configurations with Background Cosmology: Probing Dark Energy at Astrophysical Scales
• The very local Hubble flow: computer simulations of dynamical history
• New distances of unresolved dwarf elliptical galaxies in the vicinity of the Local Group
• Non-Friedmann cosmology for the Local Universe, significance of the universal Hubble constant and short-distance indicators of dark energy
• Gravitational Binding, Virialization and the Peculiar Velocity Distribution of the Galaxies
• Two-fluid matter-quintessence FLRW models: energy transfer and the equation of state of the universe
• Dark energy domination in the Virgocentric flow
• The Local Hubble Flow: Is it a Manifestation of Dark Energy?
• The age dependence of galaxy clustering
• Constrained simulations of the local universe: II. The nature of the local Hubble flow
• Newtonian analogue of Schwarzschild de-Sitter spacetime: Influence on the local kinematics in galaxies
• Local dark energy: HST evidence from the vicinity of the M 81/M 82 galaxy group
• Dark energy and key physical parameters of clusters of galaxies
• Dark energy domination in the local flow of giant galaxies
• The Kinematic State of the Local Volume
• Ellipsoidal configurations in the de Sitter spacetime
• Locating Bound Structure in an Accelerating Universe
• Timing Argument take on the Milky Way and Andromeda past-encounter
• Painleve-Gullstrand coordinates for Schwarzschild-de Sitter spacetime
• Dark Energy as a Critical Period in Binary Motion: Bounds from Multi-scale Binaries
• On the coldness of the local Hubble flow: the role of baryons
• Local dark energy: HST evidence from the expansion flow around Cen A/M83 galaxy group
• Dark Energy and the quietness of the Local Hubble Flow
• The frozen outskirts: a cold Hubble flow and the mass of the Local Group
• Scale Dependence of Dark Energy Antigravity
• Hints at a relationship between friction and relativistic physics