Growth of Linear Perturbations before the Era of the First Galaxies

Abstract

We calculate the evolution of linear density and temperature perturbations in a universe with dark matter, baryons, and radiation, from cosmic recombination until the epoch of the first galaxies. In addition to gravity, the perturbations are effected by electron scattering with the radiation, by radiation pressure, and by gas pressure. We include the effect of spatial fluctuations in the baryonic sound speed and show that they induce a >10% change in the baryonic density power spectrum on small scales, and a larger change on all scales in the power spectrum of gas temperature fluctuations. A precise calculation of the growth of linear perturbations is essential since they provide the initial conditions for the formation of galaxies and they can also be probed directly via cosmological 21cm fluctuations. We also show that in general the thermal history of the cosmic gas can be measured from 21cm fluctuations using a small-scale anisotropic cutoff due to the thermal width of the 21cm line.

8 pages, 6 figures, MNRAS, accepted

References in corpus (4)

• Measuring the Small-Scale Power Spectrum of Cosmic Density Fluctuations Through 21 cm Tomography Prior to the Epoch of Structure Formation
• Detecting the Earliest Galaxies Through Two New Sources of 21cm Fluctuations
• A Method for Separating the Physics from the Astrophysics of High-Redshift 21cm Fluctuations
• The CMBR fluctuations from HI perturbations prior to reionization

Cited by in corpus (87)

• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• 21-cm cosmology
• One Hundred First Stars : Protostellar Evolution and the Final Masses
• Relative velocity of dark matter and baryonic fluids and the formation of the first structures
• The halo mass function from the dark ages through the present day
• 21 cm fluctuations from inhomogeneous X-ray heating before reionization
• Evolution of the 21 cm signal throughout cosmic history
• Evolution of cosmological perturbations in Bose-Einstein condensate dark matter
• Impact of the Relative Motion between the Dark Matter and Baryons on the First Stars
• The 21cm angular-power spectrum from the dark ages
• The Fast Fourier Transform Telescope
• Suppression and Spatial Variation of Early Galaxies and Minihalos
• Descending from on high: Lyman series cascades and spin-kinetic temperature coupling in the 21 cm line
• The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
• The Rise of the First Stars: Supersonic Streaming, Radiative Feedback, and 21-cm Cosmology
• The Imprint of Warm Dark Matter on the Cosmological 21-cm Signal
• Simulations of Early Baryonic Structure Formation with Stream Velocity: II. The Gas Fraction
• Baryon acoustic signature in the clustering of density maxima
• The Physics and Early History of the Intergalactic Medium
• The Influence of Streaming Velocities on the Formation of the First Stars
• The influence of streaming velocities and Lyman-Werner radiation on the formation of the first stars
• Simulations of Early Baryonic Structure Formation with Stream Velocity: I. Halo Abundance
• The formation of the first cosmic structures and the physics of the z~20 Universe
• The First Stars in The Universe
• The formation and gas content of high redshift galaxies and minihalos
• Generation of Primordial Magnetic Fields on Linear Over-density Scales
• A new light on 21 cm intensity fluctuations from the dark ages
• The 21cm Signature of the First Stars
• The Future of Primordial Features with 21 cm Tomography
• Probing the Epoch of Early Baryonic Infall Through 21cm Fluctuations
• Spin Exchange Rates in Electron-Hydrogen Collisions
• The First Stars
• Higher-order initial conditions for mixed baryon-CDM simulations
• On the signature of the baryon-dark matter relative velocity in the two and three-point galaxy correlation functions
• Third-order Perturbation Theory With Non-linear Pressure
• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Constraints on Fundamental Cosmological Parameters with Upcoming Redshifted 21 cm Observations
• Influence of primordial magnetic fields on 21 cm emission
• Supersonic Relative Velocity between Dark Matter and Baryons: A Review
• Efficient Computation of Galaxy Bias with Neutrinos and Other Relics
• Gas in Simulations of High Redshift Galaxies and Minihalos
• Prospects for precision cosmology with the 21 cm signal from the dark ages
• On the implementation of the spherical collapse model for dark energy models
• Separating out the Alcock-Paczynski Effect on 21cm Fluctuations
• Background reionization history from omniscopes
• Low-mass suppression of the satellite luminosity function due to the supersonic baryon--cold-dark-matter relative velocity
• The Supersonic Project: Shining Light on SIGOs - a New Formation Channel for Globular Clusters
• Gas rich and gas poor structures through the stream velocity effect
• Detecting Early Galaxies Through Their 21-cm Signature
• More accurate simulations with separate initial conditions for baryons and dark matter
• The Spin-Resolved Atomic Velocity Distribution and 21-cm Line Profile of Dark-Age Gas
• Cosmological perturbations for two cold fluids in $\Lambda$CDM
• How Density Environment Changes the Influence of the Dark Matter-Baryon Streaming Velocity on the Cosmological Structure Formation
• Constraining galactic structures of mirror dark matter
• An Observational Limit on the Earliest GRBs
• Cosmological Magnetogenesis: The Biermann Battery during the Epoch of Reionization
• The Supersonic Project: rotational effects of supersonic motions on the first structures in the Universe
• Understanding large-scale structure in the SSA22 protocluster region using cosmological simulations
• Linear effects of perturbed recombination
• Non-comoving Cosmology
• Signatures of Modified Gravity on the 21-cm Power Spectrum at Reionisation
• Dark-ages Reionization & Galaxy Formation Simulation VIII. Suppressed growth of dark matter halos during the Epoch of Reionization
• The nonlinear evolution of baryonic overdensities in the early universe: Initial conditions of numerical simulations
• The Supersonic Project: To cool or not to cool Supersonically Induced Gas Objects (SIGOs)?
• ${\mathrm{H}}_2$ cooling and gravitational collapse of supersonically induced gas objects
• Constraining exotic dark matter models with the dark ages 21-cm signal
• Effect of supersonic relative motion between baryons and dark matter on collapsed objects
• A galaxy-free phenomenological model for the 21-cm power spectrum during reionization
• Source Mergers and Bubble Growth During Reionization
• Exploring compensated isocurvature perturbations with CMB spectral distortion anisotropies
• Formation of First Galaxies inside Density Peaks and Voids under the Influence of Dark Matter-Baryon Streaming Velocity, I: Initial Condition and Simulation Scheme
• The influence of primordial magnetic fields on the spherical collapse model in cosmology
• 21cmFirstCLASS II. Early linear fluctuations of the 21cm signal
• The Supersonic Project: The Early Evolutionary Path of SIGOs
• The Supersonic Project: The eccentricity and rotational support of SIGOs and DM GHOSts
• Joint 21-cm and CMB Forecasts for Constraining Self-Interacting Massive Neutrinos
• Cosmological perturbations in the $\Lambda$CDM-like limit of a polytropic dark matter model
• Relative baryon-dark matter velocities in cosmological zoom simulations
• Lyman-alpha Heating of Inhomogeneous High-redshift Intergalactic Medium
• Magnetic Fields from Compensated Isocurvature Perturbations
• Global signal in the redshifted hydrogen 21-cm line from the Dark Ages and Cosmic Dawn: Dependence on the nature of dark matter and modeling of first light
• Effect of Separate Initial Conditions on the Lyman-$\alpha$ Forest in Simulations
• Eigenmode analysis of perurbations in the primordial medium at and before recombination
• The Supersonic Project: SIGOs, a Proposed Progenitor to Globular Clusters, and their Connections to Gravitational Wave Anisotropies
• CDM and Baryons as Distinct Fluids in a Linear Approximation for the Growth of Structure
• Magnetic fields from small-scale primordial perturbations