Cosmology with kSZ: breaking the optical depth degeneracy with Fast Radio Bursts

Abstract

The small-scale cosmic microwave background (CMB) is dominated by anisotropies from the kinematic Sunyaev-Zeldovich (kSZ) effect, and upcoming experiments will measure it very precisely, but the optical depth degeneracy limits the cosmological information that can be extracted. At the same time, fast radio bursts (FRBs) are an exciting new frontier for astrophysics, but their usefulness as cosmological probes is currently unclear. We show that FRBs are uniquely suited for breaking the kSZ optical depth degeneracy. This opens up new possibilities for constraining cosmology with the kSZ effect, and new cosmological applications for FRBs.

7 pages, 4 figures, minor changes for clarity, accepted for publication in Physical Review D

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• CHIME/FRB Catalog 1 results: statistical cross-correlations with large-scale structure
• Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment
• Beaming as an explanation of the repetition/width relation in FRBs
• On the Use of Fast Radio Burst Dispersion Measures as Distance Measures
• Statistical modelling of the cosmological dispersion measure
• Deep Synoptic Array science: Two fast radio burst sources in massive galaxy clusters
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• Breaking baryon-cosmology degeneracy with the electron density power spectrum
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• Probing cosmic birefringence with polarized Sunyaev-Zel'dovich tomography
• Taking measurements of the kinematic Sunyaev-Zel'dovich effect forward: including uncertainties from velocity reconstruction with forward modeling
• Velocity reconstruction with the cosmic microwave background and galaxy surveys
• Characterizing fast radio bursts through statistical cross-correlations
• Primordial trispectrum from kSZ tomography
• Searching for Gravitational Waves with Strongly Lensed Repeating Fast Radio Bursts
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• Convolutional Neural Network-reconstructed velocity for kinetic SZ detection
• Effect of Redshift Distributions of Fast Radio Bursts on Cosmological Constraints
• Patchy Screening of the CMB from Dark Photons
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• Cosmology from the kinetic polarized Sunyaev Zel'dovich effect
• Cosmology with the thermal-kinetic Sunyaev-Zel'dovich effect
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• Subtracting the kinetic Sunyaev-Zeldovich effect from the cosmic microwave background with surveys of large-scale structure
• Linear anisotropies in dispersion-measure-based cosmological observables
• Remote Dipole Field Reconstruction with Dusty Galaxies
• Pairwise kSZ signal extraction efficacy and optical depth estimation
• Relativistic imprints on dispersion measure space distortions
• Cosmological probes of helium reionization
• Breaking the ${\tau }_{\mathrm{T}}-f$ degeneracy of the kinetic Sunyaev Zel'dovich cosmology in redshift space
• Information Wells and the Emergence of Primordial Black Holes in a Cyclic Quantum Universe
• Do Multi-Structural One-Off FRBs Trace Similar Cosmology History with Repeaters?
• Maximum likelihood kinetic Sunyaev Zel'dovich velocity reconstruction
• Novel Cosmological Tests from Combining Galaxy Lensing and the Polarized Sunyaev-Zel'dovich Effect
• Exploring selection biases in FRB dispersion-galaxy cross-correlations with magnetohydrodynamical simulations
• Towards a multi-tracer neutrino mass measurement with line-intensity mapping
• Fast Radio Burst Cosmology and HIRAX
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• On the capability of high redshift kSZ measurement with galaxy surveys