Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Deaglan J. Bartlett"'
Autor:
Matthew Ho, Deaglan J. Bartlett, Nicolas Chartier, Carolina Cuesta-Lazaro, Simon Ding, Axel Lapel, Pablo Lemos, Christopher C. Lovell, T. Lucas Makinen, Chirag Modi, Viraj Pandya, Shivam Pandey, Lucia A. Perez, Benjamin Wandelt, Greg L. Bryan
Publikováno v:
The Open Journal of Astrophysics, Vol 7 (2024)
This paper presents the Learning the Universe Implicit Likelihood Inference (LtU-ILI) pipeline, a codebase for rapid, user-friendly, and cutting-edge machine learning (ML) inference in astrophysics and cosmology. The pipeline includes software for im
Externí odkaz:
https://doaj.org/article/af69423f4173436cad76953bf39249be
Autor:
Deaglan J. Bartlett, Harry Desmond
Publikováno v:
The Open Journal of Astrophysics, Vol 6 (2023)
The history of the seemingly simple problem of straight line fitting in the presence of both $x$ and $y$ errors has been fraught with misadventure, with statistically ad hoc and poorly tested methods abounding in the literature. The problem stems fro
Externí odkaz:
https://doaj.org/article/27f9d5e2909d4780bf899501354da464
Autor:
Valeri Vardanyan, Deaglan J. Bartlett
Publikováno v:
Universe, Vol 9, Iss 7, p 340 (2023)
The non-linear dynamics of scalar fields coupled to matter and gravity can lead to remarkable density-dependent screening effects. In this short review, we present the main classes of screening mechanisms, and discuss their tests in laboratory and as
Externí odkaz:
https://doaj.org/article/5213e3274bf845a39de649a7c11aeb6f
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 514:4026-4045
We apply machine learning, a powerful method for uncovering complex correlations in high-dimensional data, to the galaxy-halo connection of cosmological hydrodynamical simulations. The mapping between galaxy and halo variables is stochastic in the ab
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aea79168bf740cddf03dbceca77fddb0
https://doi.org/10.1093/mnras/stac1609
https://doi.org/10.1093/mnras/stac1609
Lorentz invariance violation in quantum gravity (QG) models or a nonzero photon mass, $m_\gamma$, would lead to an energy-dependent propagation speed for photons, such that photons of different energies from a distant source would arrive at different
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b32364eb937ad373074c4fa8d9fb0b0b
https://ora.ox.ac.uk/objects/uuid:20a0694a-c1ab-4e99-973b-54a67c4e5f2f
https://ora.ox.ac.uk/objects/uuid:20a0694a-c1ab-4e99-973b-54a67c4e5f2f
Symbolic Regression (SR) algorithms attempt to learn analytic expressions which fit data accurately and in a highly interpretable manner. Conventional SR suffers from two fundamental issues which we address here. First, these methods search the space
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2189127e64118cbc2bcf51fd4c2cf4bd
Publikováno v:
Physical Review D. 103
Galactic scale tests have proven to be powerful tools in constraining fundamental physics in previously under-explored regions of parameter space. The astrophysical regime which they probe is inherently complicated, and the inference methods used to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5cbfaf5b03cc3560fd4278775a0a58e4
https://doi.org/10.1103/physrevd.103.123502
https://doi.org/10.1103/physrevd.103.123502
Publikováno v:
Physical Review D
Galileons are scalar field theories which obey the Galileon symmetry $\varphi \to \varphi + b + c_\mu x^\mu$ and are capable of self-acceleration if they have an inverted sign for the kinetic term. These theories violate the Strong Equivalence Princi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27ddf19a03bdcedca7b0d3643028fbe0
http://arxiv.org/abs/2010.05811
http://arxiv.org/abs/2010.05811
Publikováno v:
Monthly Notices of the Royal Astronomical Society
We study the displacements between the centres of galaxies and their supermassive black holes (BHs) in the cosmological hydrodynamical simulation Horizon-AGN, and in a variety of observations from the literature. The BHs in Horizon-AGN feel a sub-gri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02a1ccd0b291ad161453ca9a10f268d8
Publikováno v:
Physical Review D. 104(8)
Theories of gravity that obey the Weak Equivalence Principle have the same Parametrised Post-Newtonian parameter $\gamma$ for all particles at all energies. The large Shapiro time delays of extragalactic sources allow us to put tight constraints on d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffc4a1387a73ccc94509aad036f27188