110 citations · 288 across the 23 of their papers we have counts for
24 papers
Scalable Bayesian data curation for next-generation radio experiments
S. A. K. Leeney, E. de Lera Acedo, W. J. Handley +42
Next-generation radio telescopes produce data volumes that preclude manual quality assessment, yet data curation remains essential for science. We present a general, fully automati…
Optimisation of calibration sources for global 21-cm experiments: the REACH case
Adarsh Kumar Dash, Dominic Anstey, Harry T. J. Bevins +41
The spin-flip 21-cm signal from the Cosmic Dawn and the Epoch of Reionization is an essential probe of the conditions that led to the formation of the first luminous objects in the…
Conditional Neural Bayes Ratio Estimation for Experimental Design Optimisation
S. A. K. Leeney, T. Gessey-Jones, W. J. Handley +3
For frontier experiments operating at the edge of detectability, instrument design directly determines the probability of discovery. We introduce Conditional Neural Bayes Ratio Est…
Circuit Modeling for In Situ 21 cm Radiometer Calibration
Gary Vincent Charles Allen, Saurabh Pegwal, Dirk de Villiers +42
Recent experiments in cosmology, particularly those aimed at detecting the faint, redshifted, global 21 cm hydrogen line (depth < ~200 mK, z > 7.5), have imposed stringent new requ…
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…
Radiometer Calibration using Machine Learning
S. A. K. Leeney, H. T. J. Bevins, E. de Lera Acedo +35
Radiometers are crucial instruments in radio astronomy, forming the primary component of nearly all radio telescopes. They measure the intensity of electromagnetic radiation, conve…
Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
Boyuan Liu, Daniel Kessler, Thomas Gessey-Jones +6
The first generation of stars, known as Population III (Pop III), played a crucial role in the early Universe through their unique formation environment and metal-free composition.…
Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
A. Bonaldi, P. Hartley, R. Braun +179
We present and analyse the results of the Science data challenge 3a (SDC3a, https://sdc3.skao.int/challenges/foregrounds), an EoR foreground-removal community-wide exercise organis…
Exploiting synergies between JWST and cosmic 21-cm observations to uncover star formation in the early Universe
Jiten Dhandha, Anastasia Fialkov, Thomas Gessey-Jones +6
In the current era of JWST, we continue to uncover a wealth of information about the Universe deep into the Epoch of Reionization. In this work, we use a suite of simulations with…
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…
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…
Understanding spectral artefacts in SKA-LOW 21-cm cosmology experiments: the impact of cable reflections
Oscar Sage David O'Hara, Fred Dulwich, Eloy de Lera Acedo +4
The Cosmic Dawn was marked by the formation of the first stars, and preceded the Epoch of Reionization (EoR), when the Universe underwent a fundamental transformation caused by the…
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…
Cosmic mysteries and the hydrogen 21-cm line: bridging the gap with lunar observations
Anastasia Fialkov, Thomas Gessey-Jones, Jiten Dhandha
The hydrogen 21-cm signal is predicted to be the richest probe of the young Universe including eras known as the cosmic Dark Ages, the Cosmic Dawn when the first star and black hol…
Fully Bayesian Forecasts with Evidence Networks
T. Gessey-Jones, W. J. Handley
Sensitivity forecasts inform the design of experiments and the direction of theoretical efforts. To arrive at representative results, Bayesian forecasts should marginalize their co…
Receiver design for the REACH global 21-cm signal experiment
Ian L. V. Roque, Nima Razavi-Ghods, Steven H. Carey +35
We detail the the REACH radiometric system designed to enable measurements of the 21-cm neutral hydrogen line. Included is the radiometer architecture and end-to-end system simulat…
Signatures of Cosmic Ray Heating in 21-cm Observables
T. Gessey-Jones, A. Fialkov, E. de Lera Acedo +2
Cosmic rays generated by supernovae carry away a significant portion of the lifetime energy emission of their parent star, making them a plausible mechanism for heating the early u…
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…
Impact of the Primordial Stellar Initial Mass Function on the 21-cm Signal
T. Gessey-Jones, N. S. Sartorio, A. Fialkov +6
Properties of the first generation of stars (Pop III), such as their initial mass function (IMF), are poorly constrained by observations and have yet to converge between simulation…
Radio antenna design for sky-averaged 21 cm cosmology experiments: the REACH case
J. Cumner, E. De Lera Acedo, D. I. L. de Villiers +35
Following the reported detection of an absorption profile associated with the 21~cm sky-averaged signal from the Cosmic Dawn by the EDGES experiment in 2018, a number of experiment…
Constraining Quantum Initial Conditions before Inflation
T. Gessey-Jones, W. J. Handley
We theoretically and observationally investigate different choices of initial conditions for the primordial mode function that are imposed during an epoch preceding inflation. By d…
Narrative structure of A Song of Ice and Fire creates a fictional world with realistic measures of social complexity
Thomas Gessey-Jones, Colm Connaughton, Robin Dunbar +4
Network science and data analytics are used to quantify static and dynamic structures in George R.R. Martin's epic novels, A Song of Ice and Fire, works noted for their scale and c…