110 citations · 375 across the 38 of their papers we have counts for
22 papers · 1 filter
Quantifying Sky Map Resolution Requirements for Beam Chromaticity Correction in Sky-Averaged 21 cm Experiments
Aleksandra Dragović, Dominic Anstey, Harry T. J. Bevins +1
The 21 cm hyperfine transition of neutral hydrogen provides one of the few direct probes of the early cosmic history. High-redshift detections of this signal could shine light on t…
Towards end-to-end Bayesian forward models in global 21-cm cosmology: surrogate modelling and marginalisation of beam uncertainty
Jacob L. Tutt, Dominic J. Anstey, John Cumner +3
Robust statistical inference in global 21-cm cosmology requires end-to-end uncertainty quantification that jointly handles the highly degenerate cosmological signal, foreground emi…
Impact of numerical stability in Bayesian noise wave calibration on global 21-cm experiments
Saswata Dasgupta, Adarsh Kumar Dash, Dominic Anstey +3
Detecting the global 21-cm signal from the Cosmic Dawn and Epoch of Reionization requires calibration accuracy far below the level of astrophysical foregrounds. REACH models its re…
Simulation-based tension quantification of the cosmic dipole
Mali Land-Strykowski, Harry T. J. Bevins, Oliver T. Oayda +1
The cosmic dipole measured in surveys of cosmologically distant sources consistently exceeds the expectation derived from the cosmic microwave background, posing a significant chal…
Synchrotron and free-free mapping with simulated REACH observations between 50-170 MHz
Daniel Robins, Dominic Anstey, Harry Bevins +2
Global 21cm experiments aim to detect the hydrogen 21cm signal by separating it from foreground emission that can be orders of magnitude brighter than the signal. REACH (the Radio…
Implications of SARAS3 data for Coulomb-like interacting dark matter
Shikhar Mittal, Prakhar Bansal, Harry Bevins +1
The 21-cm signal from cosmic dawn is a potentially sensitive probe of interactions between dark matter (DM) and baryons. We investigate the implications of the SARAS3 non-detection…
The magnitude of the dark ages 21-cm signal in the context of existing early and late time constraints on CDM
H. T. J. Bevins
The dark ages 21-cm signal is a promising probe of the currently unobserved infant universe between the formation of the Cosmic Microwave Background around and the…
Narrowing the discovery space of the cosmological 21-cm signal using multi-wavelength constraints
Jiten Dhandha, Anastasia Fialkov, Thomas Gessey-Jones +6
The cosmic 21-cm signal is a promising probe of the early Universe, owing to its sensitivity to the thermal state of the neutral intergalactic medium (IGM) and properties of the fi…
Rapid and Late Cosmic Reionization Driven by Massive Galaxies: a Joint Analysis of Constraints from 21-cm, Lyman Line & CMB Data Sets
Peter H. Sims, Harry T. J. Bevins, Anastasia Fialkov +6
Observations of the Epoch of Reionization (EoR) have the potential to answer long-standing questions of astrophysical interest regarding the nature of the first luminous sources an…
On the accuracy of posterior recovery with neural network emulators
H. T. J. Bevins, T. Gessey-Jones, W. J. Handley
Neural network emulators are widely used in astrophysics and cosmology to approximate complex simulations inside Bayesian inference loops. Ad hoc rules of thumb are often used to j…
The mass distribution of the first stars can be determined via the 21-cm signal
T. Gessey-Jones, N. S. Sartorio, H. T. J. Bevins +6
The formation of the first stars and the subsequent population of X-ray binaries represents a fundamental transition in the state of the Universe as it evolves from near homogeneit…
Global 21 cm Signal Recovery Under Changing Environmental Conditions
Joe H. N. Pattison, Jean Cavillot, Harry T. J. Bevins +2
The redshifted 21 cm line of cosmic atomic hydrogen is one of the most auspicious tools in deciphering the early Universe. Recovering this signal remains an ongoing problem for cos…
Calibrating Bayesian Tension Statistics using Neural Ratio Estimation
Harry T. J. Bevins, William J. Handley, Thomas Gessey-Jones
When fits of the same physical model to two different datasets disagree, we call this tension. Several apparent tensions in cosmology have occupied researchers in recent years, and…
On the Constraints on Superconducting Cosmic Strings from 21-cm Cosmology
T. Gessey-Jones, S. Pochinda, H. T. J. Bevins +5
Constraints on the potential properties of superconducting cosmic strings provide an indirect probe of physics beyond the standard model at energies inaccessible to terrestrial par…
Constraining the properties of Population III galaxies with multi-wavelength observations
S. Pochinda, T. Gessey-Jones, H. T. J. Bevins +7
The early Universe, spanning 400,000 to 400 million years after the Big Bang (), has been left largely unexplored as the light from luminous objects is too faint t…
Joint analysis constraints on the physics of the first galaxies with low frequency radio astronomy data
Harry T. J. Bevins, Stefan Heimersheim, Irene Abril-Cabezas +5
The first billion years of cosmic history remains largely unobserved. We demonstrate, using a novel machine learning technique, how combining upper limits on the spatial fluctuatio…
Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
H. T. J. Bevins, A. Fialkov, E. de Lera Acedo +4
Observations of the redshifted 21-cm line of atomic hydrogen have resulted in several upper limits on the 21-cm power spectrum and a tentative detection of the sky-averaged signal…
The REACH radiometer for detecting the 21-cm hydrogen signal from redshift 7.5 to 28
E. de Lera Acedo, D. I. L. de Villiers, N. Razavi-Ghods +31
Observations of the 21-cm line from primordial hydrogen promise to be one of the best tools to study the early epochs of the Universe: the Dark Ages, the Cosmic Dawn, and the subse…
Marginal Bayesian Statistics Using Masked Autoregressive Flows and Kernel Density Estimators with Examples in Cosmology
Harry Bevins, Will Handley, Pablo Lemos +3
Cosmological experiments often employ Bayesian workflows to derive constraints on cosmological and astrophysical parameters from their data. It has been shown that these constraint…
A Comprehensive Bayesian re-analysis of the SARAS2 data from the Epoch of Reionization
H. T. J. Bevins, E. de Lera Acedo, A. Fialkov +4
We present a Bayesian re-analysis of the sky-averaged 21-cm experimental data from SARAS2 using nested sampling implemented with polychord, spectrally smooth foreground modelling i…
GLOBALEMU: A novel and robust approach for emulating the sky-averaged 21-cm signal from the cosmic dawn and epoch of reionisation
H. T. J. Bevins, W. J. Handley, A. Fialkov +2
Emulation of the Global (sky-averaged) 21-cm signal with neural networks has been shown to be an essential tool for physical signal modelling. In this paper we present globalemu, a…
maxsmooth: Rapid Maximally Smooth Function Fitting With Applications in Global 21-cm Cosmology
H. T. J. Bevins, W. J. Handley, A. Fialkov +3
Maximally Smooth Functions (MSFs) are a form of constrained functions in which there are no inflection points or zero crossings in high order derivatives. Consequently, they have a…