From the 2 of 6 linked papers with an AI index.
6 papers
Impact of numerical stability in Bayesian noise wave calibration on global 21-cm experiments
Saswata Dasgupta, Adarsh Kumar Dash, Dominic Anstey +3
The paper identifies and mitigates a numerical instability in the Bayesian noise‑wave calibration used for global 21‑cm experiments, improving reproducibility and accuracy of recei…
Global 21cm Measurement Calibration Methodology
Martin Bucher, Christian J. Kirkham, Eloy de Lera Acedo +2
The paper derives explicit calibration equations for global 21 cm signal experiments, reconciling earlier approaches with amplifier noise formalism and providing a Möbius‑geometry…
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…
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…
Capturing System Drift with Time Series Calibration for Global 21-cm Cosmology Experiments
Christian J. Kirkham, Dominic J. Anstey, Eloy de Lera Acedo
To achieve the sensitivity required to detect signals from neutral hydrogen from the Cosmic Dawn and Epoch of Reionisation it is critical to have a well-calibrated instrument which…
Accounting for Noise and Singularities in Bayesian Calibration Methods for Global 21-cm Cosmology Experiments
Christian J. Kirkham, William J. Handley, Jiacong Zhu +6
Due to the large dynamic ranges involved with separating the cosmological 21-cm signal from the Cosmic Dawn from galactic foregrounds, a well-calibrated instrument is essential to…