Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Harry Desmond"'
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
Publikováno v:
Universe, Vol 8, Iss 1, p 11 (2021)
Long range scalar fields with a coupling to matter appear to violate known bounds on gravitation in the solar system and the laboratory. This is evaded thanks to screening mechanisms. In this short review, we shall present the various screening mecha
Externí odkaz:
https://doaj.org/article/ef426491ee214ebd82cb4034caa84119
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
We set constraints on the dark matter halo mass and concentration of ~22,000 individual galaxies visible both in HI (from the ALFALFA survey) and optical light (from the SDSS). This is achieved by combining two Bayesian models, one for the HI line wi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::204fe1e590139fe2b783a9f5b5427fa6
http://arxiv.org/abs/2206.15443
http://arxiv.org/abs/2206.15443
Cosmological $N$-body simulations of the dark matter component of the universe typically use initial conditions with a fixed power spectrum and random phases of the density field, leading to structure consistent with the local distribution of galaxie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d98574250882cc310a1fc45fa5d0cf5d
http://arxiv.org/abs/2203.14724
http://arxiv.org/abs/2203.14724
The strong equivalence principle is violated by gravity theories of Milgromian dynamics (MOND) through the action of the external field effect. We test two different Lagrangian theories AQUAL and QUMOND based on their numerical solutions of the exter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::982d5d703f68624a616db47ebc9bfb6f
Publikováno v:
Universe, Vol 8, Iss 11, p 11 (2022)
Universe
Universe, 2021, 8 (1), pp.11. ⟨10.3390/universe8010011⟩
Universe : open access journal 8(1), 11 (2022). doi:10.3390/universe8010011 special issue: "Special Issue "Large Scale Structure of the Universe" / Special Issue Editors: Dr. Noemi Frusciante, Guest Editor; Dr. Francesco Pace, Guest Editor"
MPDI
Universe
Universe, 2021, 8 (1), pp.11. ⟨10.3390/universe8010011⟩
Universe : open access journal 8(1), 11 (2022). doi:10.3390/universe8010011 special issue: "Special Issue "Large Scale Structure of the Universe" / Special Issue Editors: Dr. Noemi Frusciante, Guest Editor; Dr. Francesco Pace, Guest Editor"
MPDI
Long range scalar fields with a coupling to matter appear to violate known bounds on gravitation in the solar system and the laboratory. This is evaded thanks to screening mechanisms. In this short review, we shall present the various screening mecha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::271ccef97eb2c9e0e8cb7fca1f0f6196
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
Theories of modified gravity generically violate the strong equivalence principle, so that the internal dynamics of a self-gravitating system in free fall depends on the strength of the external gravitational field (the external field effect). We fit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::789292a876d2b923ac88b76452834f77
http://arxiv.org/abs/2109.04745
http://arxiv.org/abs/2109.04745