# Revised estimates of CMB B-mode polarization induced by patchy reionization

@article{Roy2020RevisedEO,
title={Revised estimates of CMB B-mode polarization induced by patchy reionization},
author={A. Roy and Girish Kulkarni and P. Meerburg and A. Challinor and C. Baccigalupi and A. Lapi and M. Haehnelt},
journal={Journal of Cosmology and Astroparticle Physics},
year={2020},
volume={2021},
pages={003 - 003}
}
• A. Roy, +4 authors M. Haehnelt
• Published 2020
• Physics
• Journal of Cosmology and Astroparticle Physics
The search for primordial gravitational waves through the B-mode polarization pattern in the CMB is one of the major goals of current and future CMB experiments. Besides foregrounds, a potential hurdle in this search is the anisotropic secondary B-mode polarization generated by the scattering of CMB photons off free electrons produced during patchy cosmological reionization. Robust predictions of these secondary anisotropies are challenging because of uncertainties in the reionization history… Expand
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#### References

SHOWING 1-10 OF 176 REFERENCES
Evidence for Large-Scale Fluctuations in the Metagalactic Ionizing Background Near Redshift Six
• Physics
• 2018
The observed scatter in intergalactic Lyman-$\alpha$ opacity at $z \lesssim 6$ requires large-scale fluctuations in the neutral fraction of the intergalactic medium (IGM) after the expected end ofExpand
Is patchy reionization an obstacle in detecting the primordial gravitational wave signal
• Physics
• 2019
The large-scale cosmic microwave background (CMB) B-mode polarization is the direct probe to the low-frequency primordial gravitational wave signal. However, unambiguous measurement of this signalExpand
Quantitative Constraints on the Reionization History from the IGM Damping Wing Signature in Two Quasars at z > 7
During reionization, neutral hydrogen in the intergalactic medium (IGM) imprints a damping wing absorption feature on the spectrum of high-redshift quasars. A detection of this signature providesExpand
The Opacity of the Intergalactic Medium Measured Along Quasar Sightlines at $z\sim 6$
• Physics
• 2018
We publicly release a new sample of $34$ medium resolution quasar spectra at $5.77\leq z_{\rm em}\leq6.54$ observed with the Echellette Spectrograph and Imager (ESI) on the Keck telescope. ThisExpand
The Maximum B-mode Polarization of the Cosmic Microwave Background from Inhomogeneous Reionization
• Physics
• 2007
We compute the B-mode polarization power spectrum of the CMB from an epoch of inhomogeneous reionization, using a simple model in which H II regions are represented by ionized spherical bubbles withExpand
A Measurement of the Cosmic Microwave Background B-mode Polarization Power Spectrum at Subdegree Scales from Two Years of polarbear Data
We report an improved measurement of the cosmic microwave background B-mode polarization power spectrum with the Polarbear experiment at 150 GHz. By adding new data collected during the second seasonExpand
Reconstructing patchy reionization from the cosmic microwave background
• Physics
• 2009
We introduce a new statistical technique for extracting the inhomogeneous reionization signal from future high-sensitivity measurements of the cosmic microwave background (CMB) temperature andExpand
Observing patchy reionization with future CMB polarization experiments
• Physics
• 2018
We study the signal from patchy reionization in view of the future high accuracy polarization measurements of the Cosmic Microwave Background (CMB). We implement an extraction procedure of the patchyExpand
Are we witnessing the epoch of reionisation at $z=7.1$ from the spectrum of J1120+0641?
• Physics
• 2016
We quantify the presence of Ly\alpha\ damping wing absorption from a partially-neutral intergalactic medium (IGM) in the spectrum of the $z=7.08$ QSO, ULASJ1120+0641. Using a Bayesian framework, weExpand
Fast large volume simulations of the 21-cm signal from the reionization and pre-reionization epochs
• Physics
• 2009
While limited to low spatial resolution, the next-generation low-frequency radio interferometers that target 21-cm observations during the era of reionization and prior will have instantaneous fieldsExpand