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Anticipating a New-Physics Signal in Upcoming 21-cm Power Spectrum Observations
Rennan Barkana, Anastasia Fialkov, Hongwan Liu +1
Dark matter-baryon interactions can cool the baryonic fluid, which has been shown to modify the cosmological 21-cm global signal. We show that in a two-component dark sector with a…
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…
Improved Constraints on the 21 cm EoR Power Spectrum and the X-Ray Heating of the IGM with HERA Phase I Observations
The HERA Collaboration, Zara Abdurashidova, Tyrone Adams +92
We report the most sensitive upper limits to date on the 21 cm epoch of reionization power spectrum using 94 nights of observing with Phase I of the Hydrogen Epoch of Reionization…
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…
Emulation of the Cosmic Dawn 21-cm Power Spectrum and Classification of Excess Radio Models Using an Artificial Neural Network
Sudipta Sikder, Rennan Barkana, Itamar Reis +1
The cosmic 21-cm line of hydrogen is expected to be measured in detail by the next generation of radio telescopes. The enormous dataset from future 21-cm surveys will revolutionize…