Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Bevins, H. T. J."'
Autor:
Gessey-Jones, T., Pochinda, S., Bevins, H. T. J., Fialkov, A., Handley, W. J., Acedo, E. de Lera, Singh, S., Barkana, R.
Constraints on the potential properties of superconducting cosmic strings provide an indirect probe of physics beyond the standard model at energies inaccessible to terrestrial particle colliders. In this study, we perform the first joint Bayesian an
Externí odkaz:
http://arxiv.org/abs/2312.08828
Autor:
Pochinda, S., Gessey-Jones, T., Bevins, H. T. J., Fialkov, A., Heimersheim, S., Abril-Cabezas, I., Acedo, E. de Lera, Singh, S., Sikder, S., Barkana, R.
The early Universe, spanning 400,000 to 400 million years after the Big Bang ($z\approx1100-11$), has been left largely unexplored as the light from luminous objects is too faint to be observed directly. While new experiments are pushing the redshift
Externí odkaz:
http://arxiv.org/abs/2312.08095
Autor:
Razavi-Ghods, Nima, Roque, Ian L. V., Carey, Steven H., Ely, John A., Handley, Will, Magro, Alessio, Chiello, Riccardo, Huang, Tian, Alexander, P., Anstey, D., Bernardi, G., Bevins, H. T. J., Cavillot, J., Croukamp, W., Cumner, J., Acedo, E. de Lera, de Villiers, D. I. L., Fialkov, A., Gessey-Jones, T., Gueuning, Q., Josaitis, A. T., Kulkarni, G., Leeney, S. A. K., Maiolino, R., Meerburg, P. D., Mittal, S., Pagano, M., Pegwal, S., Pieterse, C., Pritchard, J. R., Saxena, A., Scheutwinkel, K. H., Scott, P., Shen, E., Sims, P. H., Smirnov, O., Spinelli, M., Zarb-Adami, K.
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 simulations as well as a discussion of the challenges intrinsic to highly-cal
Externí odkaz:
http://arxiv.org/abs/2307.00099
Astrophysical Constraints from the SARAS3 non-detection of the Cosmic Dawn Sky-Averaged 21-cm Signal
Autor:
Bevins, H. T. J., Fialkov, A., Acedo, E. de Lera, Handley, W. J., Singh, S., Subrahmanyan, R., Barkana, R.
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 at $z\sim17$. Made with the EDGES Low-Band antenna, this claim was rec
Externí odkaz:
http://arxiv.org/abs/2212.00464
Autor:
Acedo, E. de Lera, de Villiers, D. I. L., Razavi-Ghods, N., Handley, W., Fialkov, A., Magro, A., Anstey, D., Bevins, H. T. J., Chiello, R., Cumner, J., Josaitis, A. T., Roque, I. L. V., Sims, P. H., Scheutwinkel, K. H., Alexander, P., Bernardi, G., Carey, S., Cavillot, J., Croukamp, W., Ely, J. A., Gessey-Jones, T., Gueuning, Q., Hills, R., Kulkarni, G., Maiolino, R., Meerburg, P. D., Mittal, S., Pritchard, J. R., Puchwein, E., Saxena, A., Shen, E., Smirnov, O., Spinelli, M., Zarb-Adami, K.
Publikováno v:
Nature Astronomy 6, p 984 998, 2022
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 subsequent Epoch of Reionization. In 2018, the EDGES experiment caught the
Externí odkaz:
http://arxiv.org/abs/2210.07409
Autor:
Bevins, H. T. J., Acedo, E. de Lera, Fialkov, A., Handley, W. J., Singh, S., Subrahmanyan, R., Barkana, R.
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 implemented with maxsmooth, detailed systematic modelling and rapid sig
Externí odkaz:
http://arxiv.org/abs/2201.11531
Autor:
Cumner, J., Acedo, E. De Lera, de Villiers, D. I. L., Anstey, D., Kolitsidas, C. I., Gurdon, B., Fagnoni, N., Alexander, P., Bernardi, G., Bevins, H. T. J., Carey, S., Cavillot, J., Chiello, R., Craeye, C., Croukamp, W., Ely, J. A., Fialkov, A., Gessey-Jones, T., Gueuning, Q., Handley, W., Hills, R., Josaitis, A. T., Kulkarni, G., Magro, A., Maiolino, R., Meerburg, P. D., Mittal, S., Pritchard, J. R., Puchwein, E., Razavi-Ghods, N., Roque, I. L. V., Saxena, A., Scheutwinkel, K. H., Shen, E., Sims, P. H., Smirnov, O., Spinelli, M., Zarb-Adami, K.
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 experiments have been set up to verify this result. This paper discusses the des
Externí odkaz:
http://arxiv.org/abs/2109.10098
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 Global 21-cm signal emulator that uses redshift as a character defini
Externí odkaz:
http://arxiv.org/abs/2104.04336
Autor:
Bevins, H. T. J., Handley, W. J., Fialkov, A., Acedo, E. de Lera, Greenhill, L. J., Price, D. C.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 502, Issue 3, April 2021, Pages 4405-4425
Maximally Smooth Functions (MSFs) are a form of constrained functions in which there are no inflection points or zero crossings in high order derivatives. Consequently, they have applications to signal recovery in experiments where signals of interes
Externí odkaz:
http://arxiv.org/abs/2007.14970
We present an updated estimate of the cosmic radio background (CRB) and the corresponding attenuation lengths for ultra-high energy photons. This new estimate provides associated uncertainties as a function of frequency derived from observational con
Externí odkaz:
http://arxiv.org/abs/2004.13596