1 code implementation • 7 Jan 2021 • Samir Choudhuri, Philip Bull, Hugh Garsden
We also investigate the possibility of signal loss due to decoherence effects when non-redundant visibilities are averaged together, finding that the decoherence is worst when bright point sources pass through the beam, and that its magnitude varies significantly between baseline groups and types of primary beam variation.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
no code implementations • 4 Sep 2020 • Caroline Guandalin, Julian Adamek, Philip Bull, Chris Clarkson, L. Raul Abramo, Louis Coates
Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation, and the possibility of constraining novel gravitational phenomena beyond General Relativity (GR).
Cosmology and Nongalactic Astrophysics
1 code implementation • 6 Jul 2020 • Philip Bull, Martin White, Anže Slosar
Many theoretical models involving dynamical dark energy exhibit a 'freezing' equation of state however, where $w \to -1$ at late times, with a transition to a 'tracking' behaviour at earlier times (with $w \gg -1$ at sufficiently high redshift).
Cosmology and Nongalactic Astrophysics
2 code implementations • 23 Apr 2020 • Aaron Ewall-Wice, Nicholas Kern, Joshua S. Dillon, Adrian Liu, Aaron Parsons, Saurabh Singh, Adam Lanman, Paul La Plante, Nicolas Fagnoni, Eloy de Lera Acedo, David R. DeBoer, Chuneeta Nunhokee, Philip Bull, Tzu-Ching Chang, T. Joseph Lazio, James Aguirre, Sean Weinberg
We introduce DAYENU, a linear, spectral filter for HI intensity mapping that achieves the desirable foreground mitigation and error minimization properties of inverse co-variance weighting with minimal modeling of the underlying data.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
3 code implementations • 14 Dec 2018 • Nora Elisa Chisari, David Alonso, Elisabeth Krause, C. Danielle Leonard, Philip Bull, Jérémy Neveu, Antonio Villarreal, Sukhdeep Singh, Thomas McClintock, John Ellison, Zilong Du, Joe Zuntz, Alexander Mead, Shahab Joudaki, Christiane S. Lorenz, Tilman Troester, Javier Sanchez, Francois Lanusse, Mustapha Ishak, Renée Hlozek, Jonathan Blazek, Jean-Eric Campagne, Husni Almoubayyed, Tim Eifler, Matthew Kirby, David Kirkby, Stéphane Plaszczynski, Anze Slosar, Michal Vrastil, Erika L. Wagoner
As a result, predictions for correlation functions of galaxy clustering, galaxy-galaxy lensing and cosmic shear are demonstrated to be within a fraction of the expected statistical uncertainty of the observables for the models and in the range of scales of interest to LSST.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
1 code implementation • 22 Oct 2018 • Cosmic Visions 21 cm Collaboration, Réza Ansari, Evan J. Arena, Kevin Bandura, Philip Bull, Emanuele Castorina, Tzu-Ching Chang, Shi-Fan Chen, Liam Connor, Simon Foreman, Josef Frisch, Daniel Green, Matthew C. Johnson, Dionysios Karagiannis, Adrian Liu, Kiyoshi W. Masui, P. Daniel Meerburg, Moritz Münchmeyer, Laura B. Newburgh, Andrej Obuljen, Paul O'Connor, Hamsa Padmanabhan, J. Richard Shaw, Christopher Sheehy, Anže Slosar, Kendrick Smith, Paul Stankus, Albert Stebbins, Peter Timbie, Francisco Villaescusa-Navarro, Benjamin Wallisch, Martin White
This white paper envisions a revolutionary post-DESI, post-LSST dark energy program based on intensity mapping of the redshifted 21cm emission line from neutral hydrogen at radio frequencies.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics High Energy Physics - Experiment
1 code implementation • 30 Sep 2014 • David Alonso, Philip Bull, Pedro G. Ferreira, Mario G. Santos
For well-behaved foregrounds and instrumental effects we find that foreground subtraction can be successful to a reasonable level on most scales of interest.
Cosmology and Nongalactic Astrophysics
