Simon Pfeifer
YOU?
Author Swipe
View article: Bending the web: exploring the impact of modified gravity on the density field and halo properties within the cosmic web
Bending the web: exploring the impact of modified gravity on the density field and halo properties within the cosmic web Open
This work investigates the impact of different Modified Gravity (MG) models on the large-scale structures (LSS) properties in relation to the cosmic web (CW), using N-body simulations of f(R) and nDGP models. We analyse the impact of the M…
View article: The large-scale velocity field from the Cosmicflows-4 data
The large-scale velocity field from the Cosmicflows-4 data Open
The reconstruction of the large-scale velocity field from the grouped Cosmicflows-4 (CF4) database is presented. The lognormal bias of the inferred distances and velocities data is corrected by the Bias Gaussianization correction scheme, a…
View article: The large scale velocity field from the Cosmicflows-4 data
The large scale velocity field from the Cosmicflows-4 data Open
The reconstruction of the large scale velocity field from the grouped Cosmicflows-4 (CF4) database is presented. The lognormal bias of the inferred distances and velocities data is corrected by the Bias Gaussianization correction (BGc) sch…
View article: A Local Universe model for constrained simulations
A Local Universe model for constrained simulations Open
The aim of cosmological simulations is to reproduce the properties of the observed Universe, serving as tools to test structure and galaxy formation models. Constrained simulations of our local cosmological region up to a few hundred Mpc/h…
View article: Constrained simulations of the local Universe with Modified Gravity
Constrained simulations of the local Universe with Modified Gravity Open
We present a methodology for constructing modified gravity (MG) constrained simulations of the local Universe using positions and peculiar velocities from the CosmicFlows data set. Our analysis focuses on the following MG models: the norma…
View article: Testing Bayesian reconstruction methods from peculiar velocities
Testing Bayesian reconstruction methods from peculiar velocities Open
Reconstructing the large scale density and velocity fields from surveys of galaxy distances, is a major challenge for cosmography. The data is very noisy and sparse. Estimated distances, and thereby peculiar velocities, are strongly affect…
View article: COWS: a filament finder for Hessian cosmic web identifiers
COWS: a filament finder for Hessian cosmic web identifiers Open
The large-scale galaxy and matter distribution is often described by means of the cosmic web made up of voids, sheets, filaments, and knots. Many different recipes exist for identifying this cosmic web. Here, we focus on a sub-class of cos…
View article: On the road to per cent accuracy – V. The non-linear power spectrum beyond ΛCDM with massive neutrinos and baryonic feedback
On the road to per cent accuracy – V. The non-linear power spectrum beyond ΛCDM with massive neutrinos and baryonic feedback Open
In the context of forthcoming galaxy surveys, to ensure unbiased constraints on cosmology and gravity when using non-linear structure information, per cent-level accuracy is required when modelling the power spectrum. This calls for framew…
View article: The BAHAMAS project: effects of dynamical dark energy on large-scale structure
The BAHAMAS project: effects of dynamical dark energy on large-scale structure Open
In this work, we consider the impact of spatially uniform but time-varying dark energy (or ‘dynamical dark energy’, DDE) on large-scale structure in a spatially flat universe, using large cosmological hydrodynamical simulations that form p…
View article: Connecting the structure of dark matter haloes to the primordial power spectrum
Connecting the structure of dark matter haloes to the primordial power spectrum Open
A large body of work based on collisionless cosmological N-body simulations going back over two decades has advanced the idea that collapsed dark matter (DM) haloes have simple and approximately universal forms for their mass density and p…
View article: The bahamas project: effects of a running scalar spectral index on large-scale structure
The bahamas project: effects of a running scalar spectral index on large-scale structure Open
Recent analyses of the cosmic microwave background (CMB) and the Lyman α forest indicate a mild preference for a deviation from a power-law primordial matter power spectrum (a so-called running). We introduce an extension to the bahamas su…
View article: THE EFFECTS OF DARK ENERGY AND BARYONS AND THEIR INTERPLAY ON THE GROWTH OF STRUCTURE
THE EFFECTS OF DARK ENERGY AND BARYONS AND THEIR INTERPLAY ON THE GROWTH OF STRUCTURE Open
The discovery of the accelerated expansion of our Universe brought with it a new theoretical entity called dark energy. Within our standard model of cosmology, \lcdm{}, this dark energy component is described by a cosmological constant wit…
View article: Adapting astronomical source detection software to help detect animals in thermal images obtained by unmanned aerial systems
Adapting astronomical source detection software to help detect animals in thermal images obtained by unmanned aerial systems Open
In this paper we describe an unmanned aerial system equipped with a thermal-infrared camera and software pipeline that we have developed to monitor animal populations for conservation purposes. Taking a multi-disciplinary approach to tackl…