In this work, we analyze the Lyman-$\alpha$ forest in cosmological
hydrodynamical simulations of chameleon-type f(R) gravity with the goal to
assess whether the impact of such models is detectable in absorption line
statistics. We carry out a set of hydrodynamical simulations with the
cosmological simulation code MG-GADGET, including star formation and cooling
effects, and create synthetic Lyman-$\alpha$ absorption spectra from the
simulation outputs. We statistically compare simulations with f(R) and ordinary
general relativity, focusing on flux probability distribution functions (PDFs)
and flux power-spectra, an analysis of the column density and line width
distributions, as well as the matter power spectrum. We find that the influence
of f(R) gravity on the Lyman-$\alpha$ forest is rather small. Even models with
strong modifications of gravity, like $|f_R0| = 10^-4$, do not change
the statistical Lyman-$\alpha$ properties by more than 10%. The column density
and line width distributions are hardly affected at all. It is therefore not
possible to get competitive constraints on the background field $f_R$ using
current observational data. An improved understanding of systematics in the
observations and a more accurate modeling of the baryonic/radiative physics
would be required to allow this in the future. The impact of f(R) on the matter
power spectrum in our results is consistent with previous works.
Описание
[1411.2600] The Lyman-alpha forest in f(R) modified gravity
%0 Generic
%1 arnold2014lymanalpha
%A Arnold, Christian
%A Puchwein, Ewald
%A Springel, Volker
%D 2014
%K alpha forest gravity lyman modified
%T The Lyman-alpha forest in f(R) modified gravity
%U http://arxiv.org/abs/1411.2600
%X In this work, we analyze the Lyman-$\alpha$ forest in cosmological
hydrodynamical simulations of chameleon-type f(R) gravity with the goal to
assess whether the impact of such models is detectable in absorption line
statistics. We carry out a set of hydrodynamical simulations with the
cosmological simulation code MG-GADGET, including star formation and cooling
effects, and create synthetic Lyman-$\alpha$ absorption spectra from the
simulation outputs. We statistically compare simulations with f(R) and ordinary
general relativity, focusing on flux probability distribution functions (PDFs)
and flux power-spectra, an analysis of the column density and line width
distributions, as well as the matter power spectrum. We find that the influence
of f(R) gravity on the Lyman-$\alpha$ forest is rather small. Even models with
strong modifications of gravity, like $|f_R0| = 10^-4$, do not change
the statistical Lyman-$\alpha$ properties by more than 10%. The column density
and line width distributions are hardly affected at all. It is therefore not
possible to get competitive constraints on the background field $f_R$ using
current observational data. An improved understanding of systematics in the
observations and a more accurate modeling of the baryonic/radiative physics
would be required to allow this in the future. The impact of f(R) on the matter
power spectrum in our results is consistent with previous works.
@misc{arnold2014lymanalpha,
abstract = {In this work, we analyze the Lyman-$\alpha$ forest in cosmological
hydrodynamical simulations of chameleon-type f(R) gravity with the goal to
assess whether the impact of such models is detectable in absorption line
statistics. We carry out a set of hydrodynamical simulations with the
cosmological simulation code MG-GADGET, including star formation and cooling
effects, and create synthetic Lyman-$\alpha$ absorption spectra from the
simulation outputs. We statistically compare simulations with f(R) and ordinary
general relativity, focusing on flux probability distribution functions (PDFs)
and flux power-spectra, an analysis of the column density and line width
distributions, as well as the matter power spectrum. We find that the influence
of f(R) gravity on the Lyman-$\alpha$ forest is rather small. Even models with
strong modifications of gravity, like $|\bar{f}_{R0}| = 10^{-4}$, do not change
the statistical Lyman-$\alpha$ properties by more than 10%. The column density
and line width distributions are hardly affected at all. It is therefore not
possible to get competitive constraints on the background field $f_R$ using
current observational data. An improved understanding of systematics in the
observations and a more accurate modeling of the baryonic/radiative physics
would be required to allow this in the future. The impact of f(R) on the matter
power spectrum in our results is consistent with previous works.},
added-at = {2014-11-12T09:58:21.000+0100},
author = {Arnold, Christian and Puchwein, Ewald and Springel, Volker},
biburl = {https://www.bibsonomy.org/bibtex/2ecae00b7e2f35ee501c7e356456f4a12/miki},
description = {[1411.2600] The Lyman-alpha forest in f(R) modified gravity},
interhash = {52084388870fa1871d7cb22ee68e4d05},
intrahash = {ecae00b7e2f35ee501c7e356456f4a12},
keywords = {alpha forest gravity lyman modified},
note = {cite arxiv:1411.2600Comment: 10 pages, 7 figures, submitted to MNRAS},
timestamp = {2014-11-12T09:58:21.000+0100},
title = {The Lyman-alpha forest in f(R) modified gravity},
url = {http://arxiv.org/abs/1411.2600},
year = 2014
}