Zobrazeno 1 - 10
of 142
pro vyhledávání: '"Adamek, Julian"'
Autor:
Adamek, Julian, Clarkson, Chris, Durrer, Ruth, Heinesen, Asta, Kunz, Martin, Macpherson, Hayley J.
Publikováno v:
The Open Journal of Astrophysics 7 (2024)
Anisotropies in the distance-redshift relation of cosmological sources are expected due to large-scale inhomogeneities in the local Universe. When the observed sources are tracing a large-scale matter flow in a general spacetime geometry, the distanc
Externí odkaz:
http://arxiv.org/abs/2402.12165
For most of cosmic history, the evolution of our Universe has been governed by the physics of a 'dark sector', consisting of dark matter and dark energy, whose properties are only understood in a schematic way. The influence of these constituents is
Externí odkaz:
http://arxiv.org/abs/2401.02409
Autor:
Bonvin, Camille, Lepori, Francesca, Schulz, Sebastian, Tutusaus, Isaac, Adamek, Julian, Fosalba, Pablo
Publikováno v:
MNRAS, Volume 525, Issue 3, November 2023, Pages 4611-4627
The data on spectroscopic galaxy clustering collected by the Dark Energy Spectroscopic Instrument (DESI) will allow the significant detection of subtle features in the galaxy two-point correlation in redshift space, beyond the "standard" redshift-spa
Externí odkaz:
http://arxiv.org/abs/2306.04213
Autor:
Montandon, Thomas, Adamek, Julian, Hahn, Oliver, Noreña, Jorge, Rampf, Cornelius, Stahl, Clément, van Tent, Bartjan
Publikováno v:
JCAP 08 (2023) 043
Upcoming surveys of cosmic structures will probe scales close to the cosmological horizon, which opens up new opportunities for testing the cosmological concordance model to high accuracy. In particular, constraints on the squeezed bispectrum could r
Externí odkaz:
http://arxiv.org/abs/2212.06799
Publikováno v:
Journal of Cosmology and Astroparticle Physics, Volume 2023, February 2023
We present the halo number counts and its two-point statistics, the observable angular power spectrum, extracted for the first time from relativistic N-body simulations. The halo catalogues used in this work are built from the relativistic N-body cod
Externí odkaz:
http://arxiv.org/abs/2209.10533
Publikováno v:
A&A 668, A56 (2022)
Cosmological models beyond $\Lambda$CDM, like those featuring massive neutrinos or modifications of gravity, often display a characteristic change (scale-dependent suppression or enhancement) in the matter power spectrum when compared to a $\Lambda$C
Externí odkaz:
http://arxiv.org/abs/2206.14179
In this paper, we study the effective field theory (EFT) of dark energy for the $k$-essence model beyond linear order. Using particle-mesh $N$-body simulations that consistently solve the dark energy evolution on a grid, we find that the next-to-lead
Externí odkaz:
http://arxiv.org/abs/2204.13098
Publikováno v:
Phys. Rev. D 105, 021304 (2022)
In this letter we introduce the non-linear partial differential equation (PDE) $\partial^2_{\tau} \pi \propto (\vec\nabla \pi)^2$ showing a new type of instability. Such equations appear in the effective field theory (EFT) of dark energy for the $k$-
Externí odkaz:
http://arxiv.org/abs/2107.14215
Publikováno v:
Journal of Cosmology and Astroparticle Physics, Volume 2021, December 2021
In this paper we present for the first time the angular power spectra $C_\ell(z,z')$ for number counts from relativistic N-body simulations. We use the relativistic N-body code gevolution with its exact integration of lightlike geodesics which includ
Externí odkaz:
http://arxiv.org/abs/2106.01347
Publikováno v:
MNRAS,504(3),2021,3534-3543
The standard cosmological model is inherently relativistic, and yet a wide range of cosmological observations can be predicted accurately from essentially Newtonian theory. This is not the case on `ultra-large' distance scales, around the cosmic hori
Externí odkaz:
http://arxiv.org/abs/2011.12936