Simon D. M. White
YOU?
Author Swipe
View article: Reproducing Abell 2744 with the HyperMillennium Simulation
Reproducing Abell 2744 with the HyperMillennium Simulation Open
We present the Hyper Millennium (HM) simulation, an extremely large cosmological simulation designed to support next-generation galaxy surveys. The simulation follows 4.2 trillion dark matter particles in a comoving box of $2.5\ h^{-1}{\rm…
View article: A million-solar-mass object detected at a cosmological distance using gravitational imaging
A million-solar-mass object detected at a cosmological distance using gravitational imaging Open
View article: SHARP–IX. The dense, low-mass perturbers in B1938+666 and J0946+1006: implications for cold and self-interacting dark matter
SHARP–IX. The dense, low-mass perturbers in B1938+666 and J0946+1006: implications for cold and self-interacting dark matter Open
We present an extended analysis of the gravitational lens systems SDSS J0946+1006 and JVAS B1938+666. We focus on the properties of two low-mass dark matter haloes previously detected in these systems and compare them with predictions from…
View article: The effect of environment on the mass assembly history of the Milky Way and M31
The effect of environment on the mass assembly history of the Milky Way and M31 Open
We study the mass growth histories of the haloes of Milky Way and M31 analogues formed in constrained cosmological simulations of the Local Group. These gravity-only simulations constitute a fair and representative set of Λ cold dark matte…
View article: The MillenniumTNG project: impact of massive neutrinos on the cosmic large-scale structure and the distribution of galaxies
The MillenniumTNG project: impact of massive neutrinos on the cosmic large-scale structure and the distribution of galaxies Open
We discuss the cold dark matter plus massive neutrinos simulations of the MillenniumTNG project, which aim to improve understanding of how well ongoing and future large-scale galaxy surveys will measure neutrino masses. Our largest simulat…
View article: The relation of galaxies and dark matter haloes to the filamentary cosmic web
The relation of galaxies and dark matter haloes to the filamentary cosmic web Open
We use the Millennium Simulation to study the relation of galaxies and dark matter haloes to the cosmic web. We define the web as the unique, fully connected, percolating object with (unsmoothed) matter density everywhere exceeding 5.25 ti…
View article: The relation of galaxies and dark matter haloes to the filamentary cosmic web
The relation of galaxies and dark matter haloes to the filamentary cosmic web Open
We use the Millennium Simulation to study the relation of galaxies and dark matter haloes to the cosmic web. We define the web as the unique, fully connected, percolating object with (unsmoothed) matter density everywhere exceeding 5.25 ti…
View article: Constrained cosmological simulations of the Local Group using Bayesian hierarchical field-level inference
Constrained cosmological simulations of the Local Group using Bayesian hierarchical field-level inference Open
We present a novel approach based on Bayesian field-level inference that provides representative ΛCDM initial conditions for simulation of the Local Group (LG) of galaxies and its neighbourhood, constrained by present-day observations. We …
View article: Close Encounters of Wide Binaries Induced by the Galactic Tide: Implications for Stellar Mergers and Gravitational-wave Sources
Close Encounters of Wide Binaries Induced by the Galactic Tide: Implications for Stellar Mergers and Gravitational-wave Sources Open
A substantial fraction of stars can be found in wide binaries with projected separations between ∼10 2 and 10 5 au. In the standard lore of binary physics, these would evolve as effectively single stars that remotely orbit one another on s…
View article: Ray-tracing versus Born approximation in full-sky weak lensing simulations of the MillenniumTNG project
Ray-tracing versus Born approximation in full-sky weak lensing simulations of the MillenniumTNG project Open
Weak gravitational lensing is a powerful tool for precision tests of cosmology. As the expected deflection angles are small, predictions based on non-linear N-body simulations are commonly computed with the Born approximation. Here, we exa…
View article: The MillenniumTNG Project: Impact of massive neutrinos on the cosmic large-scale structure and the distribution of galaxies
The MillenniumTNG Project: Impact of massive neutrinos on the cosmic large-scale structure and the distribution of galaxies Open
We discuss the cold dark matter plus massive neutrinos simulations of the MillenniumTNG (MTNG) project, which aim to improve understanding of how well ongoing and future large-scale galaxy surveys will measure neutrino masses. Our largest …
View article: The influence of baryons on low-mass haloes
The influence of baryons on low-mass haloes Open
The Voids-within-Voids-within-Voids project used dark-matter-only (DMO) simulations to study the abundance and structure of dark matter (DM) haloes over the full mass range populated in the standard Lambda cold dark matter cosmology. Here,…
View article: Ray-tracing vs. Born approximation in full-sky weak lensing simulations of the MillenniumTNG project
Ray-tracing vs. Born approximation in full-sky weak lensing simulations of the MillenniumTNG project Open
Weak gravitational lensing is a powerful tool for precision tests of cosmology. As the expected deflection angles are small, predictions based on non-linear N-body simulations are commonly computed with the Born approximation. Here we exam…
View article: Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background Open
Recent studies indicate that thermally produced dark matter will form highly concentrated, low-mass cusps in the early universe that often survive until the present. While these cusps contain a small fraction of the dark matter, their high…
View article: The influence of baryons on low-mass haloes
The influence of baryons on low-mass haloes Open
The Voids-within-Voids-within-Voids (VVV) project used dark-matter-only simulations to study the abundance and structure of dark matter haloes over the full mass range populated in the standard $Λ\mathrm{CDM}$ cosmology. Here we explore ho…
View article: Evolution of cosmic filaments in the MTNG simulation
Evolution of cosmic filaments in the MTNG simulation Open
We present a study of the evolution of cosmic filaments across redshift with an emphasis on some important properties: filament lengths, growth rates, and radial profiles of galaxy densities. Following an observation-driven approach, we bu…
View article: Galaxies-intergalactic medium interaction calculation I: galaxy formation as a function of large-scale environment
Galaxies-intergalactic medium interaction calculation I: galaxy formation as a function of large-scale environment Open
We present the first results of hydrodynamical simulations that follow the formation of galaxies to the present day in nearly spherical regions of radius ~ 20 h^-1 Mpc/h drawn from the Millennium Simulation (Springel et al.). The regions h…
View article: The many lives of active galactic nuclei: Cooling flows, black holes and the luminosities and colours of galaxies
The many lives of active galactic nuclei: Cooling flows, black holes and the luminosities and colours of galaxies Open
We simulate the growth of galaxies and their central supermassive black holes by implementing a suite of semi-analytic models on the output of the Millennium Run, a very large simulation of the concordance Λ cold dark matter cosmogony. Our…
View article: The mass accretion history of dark matter haloes down to Earth mass
The mass accretion history of dark matter haloes down to Earth mass Open
We take advantage of the unprecedented dynamical range provided by the ‘Cosmic-Zoom’ project to study the mass accretion history (MAH) of present-day dark matter haloes over the entire mass range present in the Lambda cold dark matter para…
View article: Phase-space simulations of prompt cusps: simulating the formation of the first haloes without artificial fragmentation
Phase-space simulations of prompt cusps: simulating the formation of the first haloes without artificial fragmentation Open
The first generation of haloes forms from the collapse of the smallest peaks in the initial density field. N-body simulations of this process suggest a prompt formation of a steep power-law cusp, but these calculations are plagued by numer…
View article: Prompt cusps and the dark matter annihilation signal
Prompt cusps and the dark matter annihilation signal Open
As the first dark matter objects gravitationally condense, a density cusp forms immediately at every initial density maximum. Numerical simulations and theoretical arguments suggest that these prompt cusps can survive until the present day…
View article: Evolution of cosmic filaments in the MTNG simulation
Evolution of cosmic filaments in the MTNG simulation Open
We present a study of the evolution of cosmic filaments across redshift with an emphasis on some important properties: filament lengths, growth rates, and radial profiles of galaxy densities. Following an observation-driven approach, we bu…
View article: Interpreting Sunyaev–Zel’dovich observations with MillenniumTNG: mass and environment scaling relations
Interpreting Sunyaev–Zel’dovich observations with MillenniumTNG: mass and environment scaling relations Open
Sunyaev–Zel’dovich (SZ) measurements can dramatically improve our understanding of the intergalactic medium and the role of feedback processes in galaxy formation, allowing us to calibrate important astrophysical systematics in cosmologica…
View article: Phase-space simulations of prompt cusps: simulating the formation of the first haloes without artificial fragmentation
Phase-space simulations of prompt cusps: simulating the formation of the first haloes without artificial fragmentation Open
The first generation of haloes forms from the collapse of the smallest peaks in the initial density field. $N$-body simulations of this process suggest a prompt formation of a steep power-law cusp, but these calculations are plagued by num…
View article: The MillenniumTNG Project: semi-analytic galaxy formation models on the past lightcone
The MillenniumTNG Project: semi-analytic galaxy formation models on the past lightcone Open
Upcoming large galaxy surveys will subject the standard cosmological model, Lambda Cold Dark Matter, to new precision tests. These can be tightened considerably if theoretical models of galaxy formation are available that can predict galax…
View article: The MillenniumTNG Project: the impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps
The MillenniumTNG Project: the impact of baryons and massive neutrinos on high-resolution weak gravitational lensing convergence maps Open
We study weak gravitational lensing convergence maps produced from the MillenniumTNG simulations by direct projection of the mass distribution on the past backwards lightcone of a fiducial observer. We explore the lensing maps over a large…
View article: Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background
Limits on dark matter annihilation in prompt cusps from the isotropic gamma-ray background Open
Recent studies indicate that thermally produced dark matter will form highly concentrated, low-mass cusps in the early universe that often survive until the present. While these cusps contain a small fraction of the dark matter, their high…
View article: The MillenniumTNG Project: the hydrodynamical full physics simulation and a first look at its galaxy clusters
The MillenniumTNG Project: the hydrodynamical full physics simulation and a first look at its galaxy clusters Open
Cosmological simulations are an important theoretical pillar for understanding non-linear structure formation in our Universe and for relating it to observations on large scales. In several papers, we introduce our MillenniumTNG (MTNG) pro…
View article: The MillenniumTNG project: the galaxy population at <i>z</i> ≥ 8
The MillenniumTNG project: the galaxy population at <i>z</i> ≥ 8 Open
The early release science results from JWST have yielded an unexpected abundance of high-redshift luminous galaxies that seems to be in tension with current theories of galaxy formation. However, it is currently difficult to draw definitiv…
View article: The MillenniumTNG Project: high-precision predictions for matter clustering and halo statistics
The MillenniumTNG Project: high-precision predictions for matter clustering and halo statistics Open
Cosmological inference with large galaxy surveys requires theoretical models that combine precise predictions for large-scale structure with robust and flexible galaxy formation modelling throughout a sufficiently large cosmic volume. Here…