21 cm cosmology in the 21st century
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TLDR
This review detail the physics that governs the 21 cm signal and describe what might be learnt from upcoming observations, and generalize the discussion to intensity mapping of other atomic and molecular lines.Abstract:
Imaging the Universe during the first hundreds of millions of years remains one of the exciting challenges facing modern cosmology. Observations of the redshifted 21 cm line of atomic hydrogen offer the potential of opening a new window into this epoch. This will transform our understanding of the formation of the first stars and galaxies and of the thermal history of the Universe. A new generation of radio telescopes is being constructed for this purpose with the first results starting to trickle in. In this review, we detail the physics that governs the 21 cm signal and describe what might be learnt from upcoming observations. We also generalize our discussion to intensity mapping of other atomic and molecular lines.read more
Citations
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$f(R,T)$ gravity
TL;DR: In this article, the authors considered a modified theory of gravity, where the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar and of the trace of the stress-energy tensor.
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An absorption profile centred at 78 megahertz in the sky-averaged spectrum
Judd D. Bowman,Alan E. E. Rogers,Raul A. Monsalve,Raul A. Monsalve,Raul A. Monsalve,Thomas J. Mozdzen,Nivedita Mahesh +6 more
TL;DR: The detection of a flattened absorption profile in the sky-averaged radio spectrum that is largely consistent with expectations for the 21-centimetre signal induced by early stars; however, the best-fitting amplitude of the profile is more than a factor of two greater than the largest predictions.
Journal ArticleDOI
f(R,L m ) gravity
TL;DR: In this article, the authors generalize the f(R) type gravity models by assuming that the gravitational Lagrangian is given by an arbitrary function of the Ricci scalar R and of the matter Lagrangians L m m m − 1, and derive the equations of motion for test particles, which follow from the covariant divergence of the energy-momentum tensor.
Journal ArticleDOI
Paper-64 constraints on reionization: the 21 cm power spectrum at z = 8:4
Zaki S. Ali,Aaron R. Parsons,Haoxuan Zheng,Jonathan C. Pober,Adrian Liu,James E. Aguirre,Richard F. Bradley,Gianni Bernardi,Gianni Bernardi,Chris Carilli,Carina Cheng,David DeBoer,Matthew R. Dexter,Jasper Grobbelaar,Jasper Horrell,Daniel C. Jacobs,Patricia J. Klima,David MacMahon,Matthys Maree,David F. Moore,Nima Razavi,Irina I. Stefan,William P. Walbrugh,Andre Walker +23 more
TL;DR: Papernot et al. as mentioned in this paper reported new limits on 21cm emission from cosmic reionization based on a 135 day observing campaign with a 64-element deployment of the Donald C. Backer Precision Array for Probing the Epoch of Reionization (PAPER) in South Africa.
Journal ArticleDOI
Reionization and the Cosmic Dawn with the Square Kilometre Array
Garrelt Mellema,Léon V. E. Koopmans,Filipe A. Abdalla,Gianni Bernardi,Benedetta Ciardi,S. Daiboo,A. G. de Bruyn,Kanan K. Datta,Heino Falcke,Andrea Ferrara,Ilian T. Iliev,Fabio Iocco,Vibor Jelić,Hannes Jensen,R. C. Joseph,Panos Labroupoulos,Avery Meiksin,Andrei Mesinger,A. R. Offringa,Vishambhar Pandey,Jonathan R. Pritchard,Mario G. Santos,Dominik J. Schwarz,B. Semelin,Harish Vedantham,Sarod Yatawatta,Saleem Zaroubi +26 more
TL;DR: The Square Kilometre Array (SKA) will have a low frequency component as mentioned in this paper, which has as one of its main science goals the study of the redshifted 21 cm line from the earliest phases of star and galaxy formation in the Universe.
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