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19922026
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235 papers · 1 filter

astro-ph.CO2026

Gamma-ray bursts reveal the history and faint contributors of cosmic reionization

Jing-Meng Hao, Paolo Cassata, Zhen-Ya Zheng +5

Star-forming galaxies are generally believed to be the main drivers of cosmic reionization. However, the relative contributions of bright and faint galaxies to this process remain…

astro-ph.CO2026

Searching for Unparticles with the Cosmic Microwave Background

Oliver H. E. Philcox, Guilherme L. Pimentel, Chen Yang

Multi-field models of inflation typically assume that interactions between particles can be treated perturbatively. Strongly-coupled models provide an intriguing alternative and ma…

astro-ph.CO2026

Estimating the completeness of the QUBRICS Survey with 3501 QSO redshifts from Gaia DR3 spectra

Matteo Porru, Stefano Cristiani, Francesco Guarneri +9

QSOs are essential for investigating the structure and evolution of the Universe. Historically, their identification has been concentrated in the northern hemisphere, primarily due…

astro-ph.CO2025

First Results from HERA Phase II

The HERA Collaboration, Zuhra Abdurashidova, Tyrone Adams +83

We report the first upper limits on the power spectrum of 21-cm fluctuations during the Epoch of Reionization and Cosmic Dawn from Phase II of the Hydrogen Epoch of Reionization Ar…

astro-ph.CO2025★ 7 cited

Updated dark pixel fraction constraints on reionization's end from the Lyman-series forests of XQR-30

Frederick B. Davies, Sarah E. I. Bosman, Valentina D'Odorico +16

The fraction of "dark pixels" in the Ly and other Lyman-series forests at provides a powerful constraint on the end of the reionization process. Any spectral region…

astro-ph.CO2025

Sample Variance Denoising in Cylindrical 21-cm Power Spectra

Daniela Breitman, Andrei Mesinger, Steven G. Murray +1

State-of-the-art simulations of reionisation-era 21-cm signal have limited volumes, generally orders of magnitude smaller than observations. Consequently, the Fourier modes in comm…

astro-ph.CO2025★ 9 cited

Efficient simulation of discrete galaxy populations and associated radiation fields during the first billion years

James E. Davies, Andrei Mesinger, Steven Murray

Understanding the epochs of cosmic dawn and reionisation requires us to leverage multi-wavelength and multi-tracer observations, with each dataset providing a complimentary piece o…

astro-ph.CO2025

SKA-ESO Synergies for the Epoch of Reionization and Cosmic Dawn

Andrei Mesinger, Benedetta Ciardi, James E. Davies +2

Mapping out the first billion years using the 21-cm line with the Square Kilometer Array (SKA) will revolutionize our understanding of the cosmic dawn, reionization and the galaxie…

astro-ph.CO2025★ 1 cited

Investigating Primordial Black Hole Accretion through Cosmic Optical Depth

Zi-Xuan Zhang, Junsong Cang, Yu Gao +1

Primordial black holes (PBH) accretion in the late Universe can lead to significant mass growth. A larger mass further accelerates the accretion radiation output for PBHs with init…

astro-ph.CO2025★ 4 cited

A general Bayesian model-validation framework based on null-test evidence ratios, with an example application to global 21-cm cosmology

Peter H. Sims, Steven G. Murray, Judd D. Bowman +8

Comparing composite models for multi-component observational data is a prevalent scientific challenge. When fitting composite models, there exists the potential for systematics fro…

astro-ph.CO2025★ 8 cited

Detecting galaxy-21-cm cross-correlation during reionization

Samuel Gagnon-Hartman, James E. Davies, Andrei Mesinger

The cosmic 21-cm signal promises to revolutionize studies of the Epoch of Reionization (EoR). Radio interferometers are aiming for a preliminary, low signal-to-noise (S/N) detectio…

astro-ph.CO2025★ 3 cited

Global 21 cm signal: a promising probe of primordial features

Suvedha Suresh Naik, Pravabati Chingangbam, Saurabh Singh +2

Inflationary models that involve bursts of particle production generate bump-like features in the primordial power spectrum of density perturbations. These features influence the e…

astro-ph.CO2024

Searching for a signature of turnaround in galaxy clusters with convolutional neural networks

Nikolaos Triantafyllou, Giorgos Korkidis, Vasiliki Pavlidou +1

Galaxy clusters are important cosmological probes that have helped to establish the CDM paradigm as the standard model of cosmology. However, recent tensions between diff…

astro-ph.CO2024★ 52 cited

Damping Wing-Like Features in the Stacked Ly Forest: Potential Neutral Hydrogen Islands at

Yongda Zhu, George D. Becker, Sarah E. I. Bosman +28

Recent quasar absorption line observations suggest that reionization may end as late as . As a means to search for large neutral hydrogen islands at , we revisi…

astro-ph.CO2024★ 17 cited

21cmSense v2: A modular, open-source 21cm sensitivity calculator

Steven G. Murray, Jonathan Pober, Matthew Kolopanis

The 21cm line of neutral hydrogen is a powerful probe of the high-redshift universe (Cosmic Dawn and the Epoch of Reionization), with an unprecedented potential to inform us about…

astro-ph.CO2024★ 20 cited

The importance of stochasticity in determining galaxy emissivities and UV LFs during cosmic dawn and reionization

Ivan Nikolić, Andrei Mesinger, James E. Davies +1

The stochastic nature of star formation and photon propagation in high-redshift galaxies can result in sizable galaxy-to-galaxy scatter in their properties. Ignoring this scatter b…

astro-ph.CO2024★ 5 cited

Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Resolving the Hot and Ionized Universe through the Sunyaev-Zeldovich effect

Luca Di Mascolo, Yvette Perrott, Tony Mroczkowski +23

An omnipresent feature of the multi-phase ``cosmic web'' is that warm/hot (> K) ionized gas pervades it. This gas constitutes a relevant contribution to the overall universal…

astro-ph.CO2024★ 19 cited

How informative are summaries of the cosmic 21-cm signal?

David Prelogović, Andrei Mesinger

The cosmic 21-cm signal will bring data-driven advances to studies of the Cosmic Dawn (CD) and Epoch of Reionization (EoR). Radio telescopes such as the SKA will eventually map the…

astro-ph.CO2024★ 10 cited

Euclid preparation: XLVIII. The pre-launch Science Ground Segment simulation framework

Euclid Collaboration, S. Serrano, P. Hudelot +274

The European Space Agency's Euclid mission is one of the upcoming generation of large-scale cosmology surveys, which will map the large-scale structure in the Universe with unprece…

astro-ph.CO2023★ 8 cited

Euclid preparation. LII. Forecast impact of super-sample covariance on 3x2pt analysis with Euclid

Euclid Collaboration, D. Sciotti, S. Gouyou Beauchamps +221

Deviations from Gaussianity in the distribution of the fields probed by large-scale structure surveys generate additional terms in the data covariance matrix, increasing the uncert…

astro-ph.CO2023★ 25 cited

Unveiling dark forces with measurements of the Large Scale Structure of the Universe

Salvatore Bottaro, Emanuele Castorina, Marco Costa +2

Cosmology offers opportunities to test Dark Matter independently of its interactions with the Standard Model. We study the imprints of long-range forces acting solely in the dark s…

astro-ph.CO2023★ 35 cited

21cmEMU: an emulator of 21cmFAST summary observables

Daniela Breitman, Andrei Mesinger, Steven Murray +3

Recent years have witnessed rapid progress in observations of the Epoch of Reionization (EoR). These have enabled high-dimensional inference of galaxy and intergalactic medium (IGM…

astro-ph.CO2023★ 26 cited

21cm signal sensitivity to dark matter decay

Gaétan Facchinetti, Laura Lopez-Honorez, Yuxiang Qin +1

The redshifted 21cm signal from the Cosmic Dawn is expected to provide unprecedented insights into early Universe astrophysics and cosmology. Here we explore how dark matter can he…

astro-ph.CO2023★ 17 cited

Machine-learning recovery of foreground wedge-removed 21-cm light cones for high- galaxy mapping

Jacob Kennedy, Jonathan Colaço Carr, Samuel Gagnon-Hartman +3

Upcoming experiments will map the spatial distribution of the 21-cm signal over three-dimensional volumes of space during the Epoch of Reionization (EoR). Several methods have been…