Thermalization of large energy release in the early Universe

Abstract

Spectral distortions of the cosmic microwave background (CMB) provide a unique tool for learning about the early phases of cosmic history, reaching deep into the primordial Universe. At redshifts $z<10^6$, thermalization processes become inefficient and existing limits from COBE/FIRAS imply that no more than $\Delta \rho /\rho <6\times 10^{-5}$ (95% c.l.) of energy could have been injected into the CMB. However, at higher redshifts, when thermalization is efficient, the constraint weakens and $\Delta \rho /\rho \simeq 0.01-0.1$ could in principle have occurred. Existing computations for the evolution of distortions commonly assume $\Delta \rho /\rho \ll 1$ and thus become inaccurate in this case. Similarly, relativistic temperature corrections become relevant for large energy release, but have previously not been modeled as carefully. Here we study the evolution of distortions and the thermalization process after single large energy release at $z>10^5$. We show that for large distortions the thermalization efficiency is significantly reduced and that the distortion visibility is sizeable to much earlier times. This tightens spectral distortions constraints on low-mass primordial black holes with masses $M_{\mathrm{PBH}}<6\times 10^{11}$ g. Similarly, distortion limits on the amplitude of the small-scale curvature power spectrum at wavenumbers $k>10^4{\mathrm{Mpc}}^{-1}$ and short-lived decaying particles with lifetimes $t_X<10^7$ s are tightened, however, these still require a more detailed time-dependent treatment. We also briefly discuss the constraints from measurements of the effective number of relativistic degrees of freedom and light element abundances and how these complement spectral distortion limits.

arXiv comment22 pages, 19 figures, accepted MNRAS version

References in corpus (60)

• Planck 2015 results. XIII. Cosmological parameters
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set
• The Simons Observatory: Science goals and forecasts
• The Temperature of the Cosmic Microwave Background
• New cosmological constraints on primordial black holes
• Primordial Black Holes as Dark Matter
• Big-Bang Nucleosynthesis and Hadronic Decay of Long-Lived Massive Particles
• Relic neutrino decoupling including flavour oscillations
• The Primordial Inflation Explorer (PIXIE): A Nulling Polarimeter for Cosmic Microwave Background Observations
• Primordial Nucleosynthesis in the Precision Cosmology Era
• The evolution of CMB spectral distortions in the early Universe
• Steepest growth of the power spectrum and primordial black holes
• Relic neutrino decoupling with flavour oscillations revisited
• ARCADE 2 Measurement of the Extra-Galactic Sky Temperature at 3-90 GHz
• Probing the inflaton: Small-scale power spectrum constraints from measurements of the CMB energy spectrum
• Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles
• CMB at 2x2 order: the dissipation of primordial acoustic waves and the observable part of the associated energy release
• Features and New Physical Scales in Primordial Observables: Theory and Observation
• PRISM (Polarized Radiation Imaging and Spectroscopy Mission): An Extended White Paper
• Big Bang Nucleosynthesis as a Probe of New Physics
• Power Spectrum Constraints from Spectral Distortions in the Cosmic Microwave Background
• Testing scenarios of primordial black holes being the seeds of supermassive black holes by ultracompact minihalos and CMB $\mu$-distortions
• Teasing bits of information out of the CMB energy spectrum
• Exploring Cosmic Origins with CORE: Survey requirements and mission design
• Silk damping at a redshift of a billion: a new limit on small-scale adiabatic perturbations
• Which spectral distortions does $\Lambda$CDM actually predict?
• Distinguishing different scenarios of early energy release with spectral distortions of the cosmic microwave background
• Constraining The Early-Universe Baryon Density And Expansion Rate
• Searching for Light Relics with Large-Scale Structure
• CMB spectral distortions from small-scale isocurvature fluctuations
• Signals From the Epoch of Cosmological Recombination
• Recombinations to the Rydberg States of Hydrogen and Their Effect During the Cosmological Recombination Epoch
• The synergy between CMB spectral distortions and anisotropies
• Green's function of the cosmological thermalization problem II: effect of photon injection and constraints
• Constraints on Primordial Black Holes From Big Bang Nucleosynthesis Revisited
• Constraining Primordial Black-Hole Bombs through Spectral Distortions of the Cosmic Microwave Background
• Non-universal BBN bounds on electromagnetically decaying particles
• Creation of the CMB spectrum: precise analytic solutions for the blackbody photosphere
• Unavoidable CMB spectral features and blackbody photosphere of our Universe
• A Hydrodynamical Approach to CMB mu-distortions
• Wandering in the Background: A CMB Explorer
• The profile of a narrow line after single scattering by Maxwellian electrons: relativistic corrections to the kernel of the integral kinetic equation
• Cosmological Neutrino Background Revisited
• Relativistic Thermal Bremsstrahlung Gaunt Factor for the Intracluster Plasma. II. Analytic Fitting Formulae
• CMB Spectral Distortions: Status and Prospects
• Evaporating black-to-white hole
• Another look to distortions of the CMB spectrum
• Refined approximations for the distortion visibility function and mu-type spectral distortions
• Microwave Spectro-Polarimetry of Matter and Radiation across Space and Time
• Thermal History Constraints on the Isocurvature Baryon Model
• Rich structure of non-thermal relativistic CMB spectral distortions from high energy particle cascades at redshifts $z\lesssim 2\times 10^5$
• Improved calculations of electron-ion Bremsstrahlung Gaunt factors for astrophysical applications
• The double Compton emissivity in a mildly relativistic thermal plasma within the soft photon limit
• Double Compton and Cyclo-Synchrotron in Super-Eddington Disks, Magnetized Coronae, and Jets
• The double Compton process in astrophysical plasmas
• Constraints on Gravitino Decay and the Scale of Inflation using CMB spectral distortions
• Evolution of low-frequency features in the CMB spectrum due to stimulated Compton scattering and Doppler-broadening
• Dissecting the Compton scattering kernel I: Isotropic media
• Heating of gas inside radio sources to mildly relativistic temperatures via induced Compton scattering

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• Constraints on Primordial Black Holes
• Breakdown of Hawking Evaporation opens new Mass Window for Primordial Black Holes as Dark Matter Candidate
• Constraints on Primordial Black Holes From Big Bang Nucleosynthesis Revisited
• Spectral distortion constraints on photon injection from low-mass decaying particles
• Updated BBN constraints on electromagnetic decays of MeV-scale particles
• Primordial black holes as dark matter: Interferometric tests of phase transition origin
• Big-bang nucleosynthesis with sub-GeV massive decaying particles
• The role of soft photon injection and heating in 21 cm cosmology
• Formation of trapped vacuum bubbles during inflation, and consequences for PBH scenarios
• Quasi-extremal primordial black holes are a viable dark matter candidate
• Sharp turns in axion monodromy: primordial black holes and gravitational waves
• Pinning down the primordial black hole formation mechanism with gamma-rays and gravitational waves
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• The double Compton process in astrophysical plasmas
• Constraints on late-forming exploding black holes
• CMB spectral distortions from continuous large energy release
• Feeding plankton to whales: high-redshift supermassive black holes from tiny black hole explosions
• Shaping Dark Photon Spectral Distortions
• Comparison of numerical methods for computing the repeated Compton scattering of photons in isotropic media
• Constraints on $N_{\mathrm{eff}}$ of high energy non-thermal neutrino injections upto $z\sim 10^8$ from CMB spectral distortions and abundance of light elements
• Energy injection in pre-recombination era and EDGES detection
• Primordial neutrinos fade to gray: constraints from cosmological observables
• Effects of observer peculiar motion on the isotropic background frequency spectrum: from monopole to higher multipoles
• Prospects for probing dark matter particles and primordial black holes with the Hongmeng mission using the 21 cm global spectrum at cosmic dawn
• Primordial nucleosynthesis constraints on high-z energy releases
• Immortality through the dark forces: Dark-charge primordial black holes as dark matter candidates
• Numerical scheme for evaluating the collision integrals for triple interactions in relativistic plasma
• Fifty shades of grayness: parametrizations of spectral distortions and applications in cosmology
• Primordial black holes as cosmic accelerators of light dark matter: Novel direct detection constraints
• Planck isocurvature constraint on primordial black holes lighter than a kiloton
• Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features
• Cosmological constraints on the decay of heavy relics into neutrinos