Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Pfeifer, Simon"'
Autor:
Valade, Aurelien, Libeskind, Noam I., Pomarede, Daniel, Tully, R. Brent, Hoffmann, Yehuda, Pfeifer, Simon, Kourkchi, Ehsan
Structure in the Universe is believed to have evolved out of quantum fluctuations seeded by inflation in the early Universe. These fluctuations lead to density perturbations that grow via gravitational instability into large cosmological structures.
Externí odkaz:
http://arxiv.org/abs/2409.17261
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 MG effect on
Externí odkaz:
http://arxiv.org/abs/2408.13219
Autor:
Hoffman, Yehuda, Valade, Aurélien, Libeskind, Noam I., Sorce, Jenny G., Tully, R. Brent, Pfeifer, Simon, Gottlöber, Stefan, Pomaréde, Daniel
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) scheme, and th
Externí odkaz:
http://arxiv.org/abs/2311.01340
Autor:
Pfeifer, Simon, Valade, Aurélien, Gottlöber, Stefan, Hoffman, Yehuda, Libeskind, Noam I., Hellwing, Wojciech A.
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 , the loca
Externí odkaz:
http://arxiv.org/abs/2305.05694
Autor:
Naidoo, Krishna, Hellwing, Wojciech A., Bilicki, Maciej, Libeskind, Noam, Pfeifer, Simon, Hoffman, Yehuda
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 normal branch of
Externí odkaz:
http://arxiv.org/abs/2209.14386
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 affected by the M
Externí odkaz:
http://arxiv.org/abs/2209.05846
Autor:
Pfeifer, Simon, Libeskind, Noam I., Hoffman, Yehuda, Hellwing, Wojciech A., Bilicki, Maciej, Naidoo, Krishna
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 cosmic web ident
Externí odkaz:
http://arxiv.org/abs/2201.04624
Autor:
Bose, Benjamin, Wright, Bill S., Cataneo, Matteo, Pourtsidou, Alkistis, Giocoli, Carlo, Lombriser, Lucas, McCarthy, Ian G., Baldi, Marco, Pfeifer, Simon, Xia, Qianli
In the context of forthcoming galaxy surveys, to ensure unbiased constraints on cosmology and gravity when using non-linear structure information, percent-level accuracy is required when modelling the power spectrum. This calls for frameworks that ca
Externí odkaz:
http://arxiv.org/abs/2105.12114
Autor:
Brown, Shaun T., McCarthy, Ian G., Diemer, Benedikt, Font, Andreea S., Stafford, Sam G., Pfeifer, Simon
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 haloes have simple and approximately universal forms for their mass density and pseudo-phase spac
Externí odkaz:
http://arxiv.org/abs/2005.12933
Autor:
Pfeifer, Simon, McCarthy, Ian G., Stafford, Sam G., Brown, Shaun T., Font, Andreea S., Kwan, Juliana, Salcido, Jaime, Schaye, Joop
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 part of the B
Externí odkaz:
http://arxiv.org/abs/2004.07670