Zobrazeno 1 - 10
of 199
pro vyhledávání: '"Winther, Hans A."'
Autor:
Fraser, Tristan S., Paillas, Enrique, Percival, Will J., Nadathur, Seshadri, Radinović, Slađana, Winther, Hans A.
We introduce an emulator-based method to model the cross-correlation between cosmological voids and galaxies. This allows us to model the effect of cosmology on void finding and on the shape of the void-galaxy cross-correlation function, improving on
Externí odkaz:
http://arxiv.org/abs/2407.03221
Autor:
Radinović, Slađana, Winther, Hans A., Nadathur, Seshadri, Percival, Will J., Paillas, Enrique, Fraser, Tristan Sohrab, Massara, Elena, Woodfinden, Alex
Publikováno v:
A&A 691, A39 (2024)
Under the assumption of statistical isotropy, and in the absence of directional selection effects, a stack of voids is expected to be spherically symmetric, which makes it an excellent object to use for an Alcock-Paczy\'nski (AP) test. This is common
Externí odkaz:
http://arxiv.org/abs/2407.02699
Autor:
Gordon, Jonathan, de Aguiar, Bernardo F., Rebouças, João, Brando, Guilherme, Falciano, Felipe, Miranda, Vivian, Koyama, Kazuya, Winther, Hans A.
Year 1 results of the Legacy Survey of Space and Time (LSST) will provide tighter constraints on small-scale cosmology, beyond the validity of linear perturbation theory. This heightens the demand for a computationally affordable prescription that ca
Externí odkaz:
http://arxiv.org/abs/2404.12344
A simple prediction of the nonlinear matter power spectrum in Brans-Dicke gravity from linear theory
Autor:
Sletmoen, Herman, Winther, Hans A.
Publikováno v:
A&A 689, A39 (2024)
Brans-Dicke (BD), one of the first proposed scalar-tensor theories of gravity, effectively makes the gravitational constant of general relativity (GR) time-dependent. Constraints on the BD parameter $\omega$ serve as a benchmark for testing GR, which
Externí odkaz:
http://arxiv.org/abs/2403.03786
Publikováno v:
A&A 685, A156 (2024)
The mysterious nature of the dark sector of the $\Lambda$CDM model is one of the main motivators behind the study of alternative cosmological models. A central quantity of interest for these models is the matter power spectrum, which quantifies struc
Externí odkaz:
http://arxiv.org/abs/2309.13295
We revisit a method to incorporate the Vainshtein screening mechanism in N-body simulations proposed by R. Scoccimarro in~\cite{Scoccimarro:2009eu}. We further extend this method to cover a subset of Horndeski theories that evade the bound on the spe
Externí odkaz:
http://arxiv.org/abs/2303.09549
Autor:
Woodfinden, Alex, Percival, Will J., Nadathur, Seshadri, Winther, Hans A., Fraser, T. S., Massara, Elena, Paillas, Enrique, Radinović, Slađana
We present the cosmological implications of measurements of void-galaxy and galaxy-galaxy clustering from the Sloan Digital Sky Survey (SDSS) Main Galaxy Sample (MGS), Baryon Oscillation Spectroscopic Survey (BOSS), and extended BOSS (eBOSS) luminous
Externí odkaz:
http://arxiv.org/abs/2303.06143
Publikováno v:
A&A 674, A185 (2023)
Massive neutrinos and $f(R)$ modified gravity have degenerate observational signatures that can impact the interpretation of results in galaxy survey experiments, such as cosmological parameter estimations and gravity model tests. Because of this, it
Externí odkaz:
http://arxiv.org/abs/2303.05820
The theoretical basis of dark energy remains unknown and could signify a need to modify the laws of gravity on cosmological scales. In this study we investigate how the clustering and motions of galaxies can be used as probes of modified gravity theo
Externí odkaz:
http://arxiv.org/abs/2211.07101
Autor:
Massara, Elena, Percival, Will J., Dalal, Neal, Nadathur, Seshadri, Radinović, Slađana, Winther, Hans A., Woodfinden, Alex
The velocity profile of galaxies around voids is a key ingredient for redshift space distortion (RSD) measurements made using the void-galaxy correlation function. In this paper we use simulations to test whether the velocity profile of the tracers u
Externí odkaz:
http://arxiv.org/abs/2206.14120