Search Results for author: Geraint F. Lewis

Found 10 papers, 5 papers with code

Multiverse Predictions for Habitability: Origin of Life Scenarios

no code implementations5 Mar 2023 McCullen Sandora, Vladimir Airapetian, Luke Barnes, Geraint F. Lewis, Ileana Pérez-Rodríguez

If the origin of life is rare and sensitive to the local conditions at the site of its emergence, then, using the principle of mediocrity within a multiverse framework, we may expect to find ourselves in a universe that is better than usual at creating these necessary conditions.

Dim but not entirely dark: Extracting the Galactic Center Excess' source-count distribution with neural nets

1 code implementation19 Jul 2021 Florian List, Nicholas L. Rodd, Geraint F. Lewis

The two leading hypotheses for the Galactic Center Excess (GCE) in the $\textit{Fermi}$ data are an unresolved population of faint millisecond pulsars (MSPs) and dark-matter (DM) annihilation.

Candidate Periodically Variable Quasars from the Dark Energy Survey and the Sloan Digital Sky Survey

no code implementations27 Aug 2020 Yu-Ching Chen, Xin Liu, Wei-Ting Liao, A. Miguel Holgado, Hengxiao Guo, Robert A. Gruendl, Eric Morganson, Yue Shen, Kaiwen Zhang, Tim M. C. Abbott, Michel Aguena, Sahar Allam, Santiago Avila, Emmanuel Bertin, Sunayana Bhargava, David Brooks, David L. Burke, Aurelio Carnero Rosell, Daniela Carollo, Matias Carrasco Kind, Jorge Carretero, Matteo Costanzi, Luiz N. da Costa, Tamara M. Davis, Juan De Vicente, Shantanu Desai, H. Thomas Diehl, Peter Doel, Spencer Everett, Brenna Flaugher, Douglas Friedel, Joshua Frieman, Juan García-Bellido, Enrique Gaztanaga, Karl Glazebrook, Daniel Gruen, Gaston Gutierrez, Samuel R. Hinton, Devon L. Hollowood, David J. James, Alex G. Kim, Kyler Kuehn, Nikolay Kuropatkin, Geraint F. Lewis, Christopher Lidman, Marcos Lima, Marcio A. G. Maia, Marisa March, Jennifer L. Marshall, Felipe Menanteau, Ramon Miquel, Antonella Palmese, Francisco Paz-Chinchón, Andrés A. Plazas, Eusebio Sanchez, Michael Schubnell, Santiago Serrano, Ignacio Sevilla-Noarbe, Mathew Smith, Eric Suchyta, Molly E. C. Swanson, Gregory Tarle, Brad E. Tucker, Tamas Norbert Varga, Alistair R. Walker

We present a systematic search for periodic light curves in 625 spectroscopically confirmed quasars with a median redshift of 1. 8 in a 4. 6 deg$^2$ overlapping region of the Dark Energy Survey Supernova (DES-SN) fields and the Sloan Digital Sky Survey Stripe 82 (SDSS-S82).

High Energy Astrophysical Phenomena Astrophysics of Galaxies

The GCE in a New Light: Disentangling the $γ$-ray Sky with Bayesian Graph Convolutional Neural Networks

1 code implementation22 Jun 2020 Florian List, Nicholas L. Rodd, Geraint F. Lewis, Ishaan Bhat

In simulated data, our neural network (NN) is able to reconstruct the flux of inner Galaxy emission components to on average $\sim$0. 5%, comparable to the non-Poissonian template fit (NPTF).

A unified framework for 21cm tomography sample generation and parameter inference with Progressively Growing GANs

1 code implementation19 Feb 2020 Florian List, Geraint F. Lewis

Creating a database of 21cm brightness temperature signals from the Epoch of Reionisation (EoR) for an array of reionisation histories is a complex and computationally expensive task, given the range of astrophysical processes involved and the possibly high-dimensional parameter space that is to be probed.

Generative Adversarial Network

A black box for dark sector physics: Predicting dark matter annihilation feedback with conditional GANs

no code implementations1 Oct 2019 Florian List, Ishaan Bhat, Geraint F. Lewis

Traditionally, incorporating additional physics into existing cosmological simulations requires re-running the cosmological simulation code, which can be computationally expensive.

Cosmology and Nongalactic Astrophysics

The impact of dark energy on galaxy formation. What does the future of our Universe hold?

no code implementations18 Oct 2017 Jaime Salcido, Richard G. Bower, Luke A. Barnes, Geraint F. Lewis, Pascal J. Elahi, Tom Theuns, Matthieu Schaller, Robert A. Crain, Joop Schaye

Interestingly, simulations without feedback from accreting black holes predict an upturn in the cosmic star formation rate for $t>15$ Gyr due to the rejuvenation of massive ($ > 10^{11} \mathrm{M}_{\odot}$) galaxies.

Cosmology and Nongalactic Astrophysics

Trans-Dimensional Bayesian Inference for Gravitational Lens Substructures

1 code implementation4 Aug 2015 Brendon J. Brewer, David Huijser, Geraint F. Lewis

We introduce a Bayesian solution to the problem of inferring the density profile of strong gravitational lenses when the lens galaxy may contain multiple dark or faint substructures.

Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Data Analysis, Statistics and Probability Applications

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