Zobrazeno 1 - 10
of 203
pro vyhledávání: '"Kitching, Thomas D."'
Inverse problems defined on the sphere arise in many fields, including seismology and cosmology where problems are defined on the globe and the cosmic sphere. These are generally high-dimensional and computationally very complex and, as a result, sam
Externí odkaz:
http://arxiv.org/abs/2107.06500
Autor:
Crossland, Tom, Stenetorp, Pontus, Kawata, Daisuke, Riedel, Sebastian, Kitching, Thomas D., Deshpande, Anurag, Kimpson, Tom, Liew-Cain, Choong Ling, Pedersen, Christian, Piras, Davide, Sharma, Monu
We develop a new model for automatic extraction of reported measurement values from the astrophysical literature, utilising modern Natural Language Processing techniques. We use this model to extract measurements present in the abstracts of the appro
Externí odkaz:
http://arxiv.org/abs/2107.00665
Publikováno v:
Phys. Rev. D 103, 123510 (2021)
The advent of Stage IV weak lensing surveys will open up a new era in precision cosmology. These experiments will offer more than an order-of-magnitude leap in precision over existing surveys, and we must ensure that the accuracy of our theory matche
Externí odkaz:
http://arxiv.org/abs/2103.11936
Publikováno v:
A&A 646, A124 (2021)
Weak lensing by large-scale structure is a powerful probe of cosmology if the apparent alignments in the shapes of distant galaxies can be accurately measured. Most studies have therefore focused on improving the fidelity of the shape measurements th
Externí odkaz:
http://arxiv.org/abs/2010.04178
Publikováno v:
Phys. Rev. D 102, 083535 (2020)
The precision of Stage IV cosmic shear surveys will enable us to probe smaller physical scales than ever before, however, model uncertainties from baryonic physics and non-linear structure formation will become a significant concern. The $k$-cut meth
Externí odkaz:
http://arxiv.org/abs/2009.01792
To date weak gravitational lensing surveys have typically been restricted to small fields of view, such that the $\textit{flat-sky approximation}$ has been sufficiently satisfied. However, with Stage IV surveys ($\textit{e.g. LSST}$ and $\textit{Eucl
Externí odkaz:
http://arxiv.org/abs/2004.07855
Publikováno v:
Phys. Rev. D 101, 103531 (2020)
The significant increase in precision that will be achieved by Stage IV cosmic shear surveys means that several currently used theoretical approximations may cease to be valid. An additional layer of complexity arises from the fact that many of these
Externí odkaz:
http://arxiv.org/abs/2004.01666
We study the alignments of satellite galaxies, and their anisotropic distribution, with respect to location and orientation of their host central galaxy in MassiveBlack-II and IllustrisTNG simulations. We find that: the shape of the satellite system
Externí odkaz:
http://arxiv.org/abs/2002.12238
Autor:
Pedersen, Christian, Font-Ribera, Andreu, Kitching, Thomas D., McDonald, Patrick, Bird, Simeon, Slosar, Anže, Rogers, Keir K., Pontzen, Andrew
Using a suite of hydrodynamical simulations with cold dark matter, baryons, and neutrinos, we present a detailed study of the effect of massive neutrinos on the 1-D and 3-D flux power spectra of the Lyman-$\alpha$ (Ly$\alpha$) forest. The presence of
Externí odkaz:
http://arxiv.org/abs/1911.09596
Autor:
Taylor, Peter L., Kitching, Thomas D., Alsing, Justin, Wandelt, Benjamin D., Feeney, Stephen M., McEwen, Jason D.
Publikováno v:
Phys. Rev. D 100, 023519 (2019)
Density-estimation likelihood-free inference (DELFI) has recently been proposed as an efficient method for simulation-based cosmological parameter inference. Compared to the standard likelihood-based Markov Chain Monte Carlo (MCMC) approach, DELFI ha
Externí odkaz:
http://arxiv.org/abs/1904.05364