Cosmic reionization in a dynamic quintessence cosmology
arXiv:0708.4153 · doi:10.1111/j.1365-2966.2008.12894.x
Abstract
In this paper we investigate the effects that a dynamic dark energy component dominant in the universe at late epochs has on reionization. We follow the evolution of HII regions with the analytic approach of Furlanetto and Oh (2005) in two different universes for which we assume the Peebles and Ratra (2003) and Brax and Martin (2000) quintessence models and we compare our results to the LCDM scenario. We show that, for a fixed ionization efficiency, at the same cosmological epoch the topology of bubbles is dominated by high-mass objects and the characteristic size of the ionized regions is slightly smaller than in the LCDM model, especially at the latest stages of reionization, due to the higher recombination efficiency. As a consequence, the bubbles' `epoch of overlap' happens earlier than in LCDM. Finally, we show how the different evolution of the HII regions affects the transmission of the high-z QSO spectra, reducing the Lyman flux absorption at small optical depths.
10 pages, minor changes to match the version accepted for publication by MNRAS
References in corpus (38)
- First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- The Cosmological Constant and Dark Energy
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
- In the Beginning: The First Sources of Light and the Reionization of the Universe
- A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
- Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar
- The Growth of HII Regions During Reionization
- Reionization of the Inhomogeneous Universe
- The End of the Reionization Epoch Probed by Ly-alpha Emitters at z=6.5 in the Subaru Deep Field
- Cosmological Reionization by Stellar Sources
- The halo mass function from the dark ages through the present day
- Simulating Cosmic Reionization at Large Scales I: the Geometry of Reionization
- The First Cosmic Structures and their Effects
- Luminosity functions of Lyman-alpha emitters at z=6.5, and z=5.7: evidence against reionization at z=6
- Numerical study of halo concentrations in dark-energy cosmologies
- Unusually Large Fluctuations in the Statistics of Galaxy Formation at High Redshift
- Early reionization by miniquasars
- Probing the Ionization State of the Universe at z>6
- The Robustness of Quintessence
- Reionization of Hydrogen and Helium by Early Stars and Quasars
- The Halo Mass Function: High-Redshift Evolution and Universality
- The Reionization History at High Redshifts I: Physical Models and New Constraints from CMB Polarization
- The Evolution of Optical Depth in the Ly-alpha Forest: Evidence Against Reionization at z~6
- Early Reionization by the First Galaxies
- Taxing the Rich: Recombinations and Bubble Growth During Reionization
- The Thermal Memory of Reionization History
- Self-regulated reionization
- Cosmic Reionisation by Stellar Sources: Population III Stars
- Cosmic Reionisation by Stellar Sources: Population II Stars
- Simulating IGM Reionization
- On the Evolution of the Ionizing Emissivity of Galaxies and Quasars Required by the Hydrogen Reionization
- Present and future evidence for evolving dark energy
- Constraining the Topology of Reionization Through Lyman-alpha Absorption
- The Extended Starformation History of the First Generation of Stars, and the Reionization of Cosmic Hydrogen
- Early structure formation in quintessence models and its implications for cosmic reionisation from first stars
- A closer look at using quasar near-zones as a probe of neutral hydrogen in the intergalactic medium