2.4k citations · 5.1k across the 31 of their papers we have counts for
31 papers
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…
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…
Sky-averaged 21-cm signal extraction using multiple antennas with an SVD framework: the REACH case
Anchal Saxena, P. Daniel Meerburg, Eloy de Lera Acedo +2
In a sky-averaged 21-cm signal experiment, the uncertainty on the extracted signal depends mainly on the covariance between the foreground and 21-cm signal models. In this paper, w…
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…
A General Bayesian Framework to Account for Foreground Map Errors in Global 21-cm Experiments
Michael Pagano, Peter Sims, Adrian Liu +3
Measurement of the global 21-cm signal during Cosmic Dawn (CD) and the Epoch of Reionization (EoR) is made difficult by bright foreground emission which is 2-5 orders of magnitude…
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…
Cosmological constraints on decaying axion-like particles: a global analysis
Csaba Balázs, Sanjay Bloor, Tomás E. Gonzalo +8
Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the…
Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
Elcio Abdalla, Guillermo Franco Abellán, Amin Aboubrahim +200
In this paper we will list a few important goals that need to be addressed in the next decade, also taking into account the current discordances between the different cosmological…
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…
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…
Informing antenna design for sky-averaged 21-cm experiments using a simulated Bayesian data analysis pipeline
Dominic Anstey, John Cumner, Eloy de Lera Acedo +1
Global 21cm experiments aim to measure the sky averaged HI absorption signal from cosmic dawn and the epoch of reionisation. However, antenna chromaticity coupling to bright foregr…
Thermal WIMPs and the Scale of New Physics: Global Fits of Dirac Dark Matter Effective Field Theories
The GAMBIT Collaboration, Peter Athron, Neal Avis Kozar +24
We assess the status of a wide class of WIMP dark matter (DM) models in light of the latest experimental results using the global fitting framework . We perform a…
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…
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…
Perturbations and the Future Conformal Boundary
A. N. Lasenby, W. J. Handley, D. J. Bartlett +1
The concordance model of cosmology predicts a universe which finishes in a finite amount of conformal time at a future conformal boundary. We show that for particular cases we stud…
Improved cosmological fits with quantized primordial power spectra
D. J. Bartlett, W. J. Handley, A. N. Lasenby
We observationally examine cosmological models based on primordial power spectra with quantized wavevectors. Introducing a linearly quantized power spectrum with $k_0=3.225\times10…
When tension is just a fluctuation: How noisy data affect model comparison
B. Joachimi, F. Köhlinger, W. Handley +1
Summary statistics of the likelihood, such as the Bayesian evidence, offer a principled way of comparing models and assessing tension between, or within, the results of physical ex…
Nonlinear Hamiltonian analysis of new quadratic torsion theories Part I. Cases with curvature-free constraints
W. E. V. Barker, A. N. Lasenby, M. P. Hobson +1
It was recently found that, when linearised in the absence of matter, 58 cases of the general gravitational theory with quadratic curvature and torsion are (i) free from ghosts and…
Bayesian noise wave calibration for 21-cm global experiments
I. L. V. Roque, W. J. Handley, N. Razavi-Ghods
Detection of millikelvin-level signals from the 'Cosmic Dawn' requires an unprecedented level of sensitivity and systematic calibration. We report the theory behind a novel calibra…
Global Analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey
F. Lienhard, D. Queloz, M. Gillon +10
We conducted a global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey - a prototype of the SPECULOOS transit search conducted with the TRAPPIST-South robotic telescope in…
Planck intermediate results. LVII. Joint Planck LFI and HFI data processing
Planck Collaboration, Y. Akrami, K. J. Andersen +136
We present the NPIPE processing pipeline, which produces calibrated frequency maps in temperature and polarization from data from the Planck Low Frequency Instrument (LFI) and High…
Mapping Poincaré gauge cosmology to Horndeski theory for emergent dark energy
W. E. V. Barker, A. N. Lasenby, M. P. Hobson +1
The ten-parameter, quadratic Poincaré gauge theory of gravity is a plausible alternative to general relativity. We show that the rich background cosmology of the gauge theory is de…
Planck intermediate results. LVI. Detection of the CMB dipole through modulation of the thermal Sunyaev-Zeldovich effect: Eppur si muove II
Planck Collaboration, Y. Akrami, M. Ashdown +126
The largest temperature anisotropy in the cosmic microwave background (CMB) is the dipole, which has been measured with increasing accuracy for more than three decades, particularl…