New Constraints on the free-streaming of warm dark matter from intermediate and small scale Lyman-$\alpha$ forest data

Abstract

We present new measurements of the free-streaming of warm dark matter (WDM) from Lyman-$\alpha$ flux-power spectra. We use data from the medium resolution, intermediate redshift XQ-100 sample observed with the X-shooter spectrograph ($z=3-4.2$) and the high-resolution, high-redshift sample used in Viel et al. (2013) obtained with the HIRES/MIKE spectrographs ($z=4.2-5.4$). Based on further improved modelling of the dependence of the Lyman-$\alpha$ flux-power spectrum on the free-streaming of dark matter, cosmological parameters, as well as the thermal history of the intergalactic medium (IGM) with hydrodynamical simulations, we obtain the following limits, expressed as the equivalent mass of thermal relic WDM particles. The XQ-100 flux power spectrum alone gives a lower limit of 1.4 keV, the re-analysis of the HIRES/MIKE sample gives 4.1 keV while the combined analysis gives our best and significantly strengthened lower limit of 5.3 keV (all 2$\sigma$ C.L.). The further improvement in the joint analysis is partly due to the fact that the two data sets have different degeneracies between astrophysical and cosmological parameters that are broken when the data sets are combined, and more importantly on chosen priors on the thermal evolution. These results all assume that the temperature evolution of the IGM can be modelled as a power law in redshift. Allowing for a non-smooth evolution of the temperature of the IGM with sudden temperature changes of up to 5000K reduces the lower limit for the combined analysis to 3.5 keV. A WDM with smaller thermal relic masses would require, however, a sudden temperature jump of $5000K$ or more in the narrow redshift interval $z=4.6-4.8$, in disagreement with observations of the thermal history based on high-resolution resolution Lyman-$\alpha$ forest data and expectations for photo-heating and cooling in the low density IGM at these redshifts.

arXiv comment15 pages, 7 figures; version 3 - corrected a typo in Table II for re-analysis of HIRES/MIKE data with Thermal priors

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• A closer look at the seesaw-dark matter correspondence
• Mass accretion rates and multi-scale halo environment in cold and warm dark matter cosmologies
• Clues to the nature of dark matter from first galaxies
• Measurement of redshift-space two- and three-point correlation of Ly$\alpha$ absorbers at $1.7<z<3.5$: Implications on evolution of the physical properties of IGM
• Collider fingerprints of freeze-in dark matter produced during the fast expansion phase of Universe
• Warm and Cold Dark Matter in Bouncing Universe
• Dark matter model favoured by reionization data: 7 keV sterile neutrino vs cold dark matter
• Warm dark matter model with a few keV mass is bad for the too-big-to-fail problem
• Lognormal semi-numerical simulations of the Lyman-$\alpha$ forest: comparison with full hydrodynamic simulations
• Small-scale structure from charged leptophilia
• The imprint of dark subhaloes on the circumgalactic medium
• The Compressed 3D Lyman-Alpha Forest Bispectrum
• Testing extensions to LCDM on small scales with forthcoming cosmic shear surveys
• Interacting light thermal-relic dark matter: self-consistent cosmological bounds
• Impact of Dark Sector Preheating on CMB Observables
• Lyman-α polarization from cosmological ionization fronts: I. Radiative transfer simulations
• Halo heating from fluctuating gas in a model dwarf
• Analytical warm dark matter power spectrum on small scales
• Cosmological implications of inflaton-mediated dark and visible matter scatterings after reheating
• Structure Formation with Warm White Noise: Effects of Finite Number Density and Velocity Dispersion in Particle and Wave Dark Matter
• Testable dark matter solution within the seesaw mechanism
• Performance of ESPRESSO's high resolution 4x2 binning for characterizing intervening absorbers towards faint quasars
• Confronting global 21-cm signal with ${\mathbb{Z}}_3$ symmetric dark matter models
• Freeze-in and freeze-out production of Higgs portal Majorana fermionic dark matter during and after reheating
• Exploring Ultralight Scalar Assistance in Sterile Neutrino Dark Matter: Cold Spectrum and Unusual X/Gamma-ray Signatures
• Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses
• Macromodel-free flux-ratio prediction in quadruply imaged quasars with local constraints from lensed arcs
• Gravitational SIMPs
• Distinguishing thermal histories of dark matter from structure formation
• Status and Perspectives of Neutrino Physics
• Super-resolution simulation of the Fuzzy Dark Matter cosmological model
• Modeling the Cosmological Lyman-$\alpha$ Forest at the Field Level
• Weighing Cosmic Structures with Clusters of Galaxies and the Intergalactic Medium
• Spontaneous CP violation, sterile neutrino dark matter, and leptogenesis
• Parameter estimation from Ly$\alpha$ forest in Fourier space using Information Maximising Neural Network
• Structure Formation Limits on Axion-Like Dark Matter
• Cored Dark Matter halos in the Cosmic Neutrino Background
• Small-scale Cosmic Signatures of Feebly Interacting Massive Particles
• Constraints on the velocity dispersion of Dark Matter from Cosmology and new bounds on scattering from the Cosmic Dawn
• Comparison of simulations and semi-analytical model for WDM subhalo mass functions
• Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
• Producing and constraining self-interacting hidden sector dark matter
• Warm, not Fuzzy: Generalized Ultralight Dark Matter Limits from Milky Way Satellites
• Probing power spectrum enhancement at small scales with the SKA
• Oscillation Baryogenesis via Ultraviolet Dark Matter Freeze-In
• Sterile Neutrino Dark Matter and Leptogenesis in Left-Right Symmetric Theories
• Freeze-in Leptogenesis via Dark-Matter Oscillations
• Probing the warm dark matter mass with [C II] intensity mapping
• Cosmic structure formation in a flavoured U$\left(1\right)$ dark sector at small scales
• Godzilla, a monster lurks in the Sunburst galaxy
• Detecting low-mass haloes with strong gravitational lensing I: the effect of data quality and lensing configuration
• Neural network emulator to constrain the high-$z$ IGM thermal state from Lyman-$\alpha$ forest flux auto-correlation function