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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…