Realistic simulations of galaxy formation in f(R) modified gravity

  title={Realistic simulations of galaxy formation in f(R) modified gravity},
  author={Christian Arnold and Matteo Leo and Baojiu Li},
  journal={Nature Astronomy},
Future astronomical surveys will gather information that will allow gravity to be tested on cosmological scales, where general relativity is currently poorly constrained. We present a set of cosmological hydrodynamical simulations that follow galaxy formation in f(R) modified gravity models and are dedicated to finding observational signatures to help distinguish general relativity from alternatives using this information. The simulations employ the IllustrisTNG model and a new modified gravity… 
Simulating galaxy formation in f(R) modified gravity: matter, halo, and galaxy statistics
We present an analysis of the matter, halo, and galaxy clustering in f(R)-gravity employing the SHYBONE full-physics hydrodynamical simulation suite. Our analysis focuses on the interplay between
Probing gravity with redshift-space distortions: Effects of tracer bias and sample selection
We investigate clustering properties of dark matter halos and galaxies to search for optimal statistics and scales where possible departures from general relativity (GR) could be found. We use large
Cosmological simulations of galaxy formation
Over recent decades, cosmological simulations of galaxy formation have been instrumental in advancing our understanding of structure and galaxy formation in the Universe. These simulations follow the
A general framework to test gravity using galaxy clusters III: observable-mass scaling relations in f(R) gravity
We test two methods, including one that is newly proposed in this work, for correcting for the effects of chameleon $f(R)$ gravity on the scaling relations between the galaxy cluster mass and four
Galaxy formation in the brane world I: overview and first results
We carry out ``full-physics'' hydrodynamical simulations of galaxy formation in the normal-branch Dvali-Gabadadze-Porrati (nDGP) braneworld model using a new modified version of the {\sc Arepo} code
Gravitational couplings in Chameleon models
We consider cosmological models where dark energy is described by a dynamical field equipped with the Chameleon screening mechanism, which serves to hide its effects in local dense regions and to
Towards testing the theory of gravity with DESI: summary statistics, model predictions and future simulation requirements
Shortly after its discovery, General Relativity (GR) was applied to predict the behavior of our Universe on the largest scales, and later became the foundation of modern cosmology. Its validity has
The impact of modified gravity on the Sunyaev–Zeldovich effect
We study the effects of two popular modified gravity theories, which incorporate very different screening mechanisms, on the angular power spectra of the thermal (tSZ) and kinematic (kSZ)
Misinterpreting modified gravity as dark energy: a quantitative study
Standard cosmological data analyses typically constrain simple phenomenological dark-energy parameters, for example the present-day value of the equation of state parameter, w 0, and its variation
Novel Probes Project: Tests of gravity on astrophysical scales
We introduce The Novel Probes Project, an initiative to advance the field of astrophysical tests of the dark sector by creating a forum that connects observers and theorists. This review focuses on


Galaxy–galaxy weak gravitational lensing in $f(R)$ gravity
We present an analysis of galaxy–galaxy weak gravitational lensing (GGL) in chameleon f(R) gravity – a leading candidate of non-standard gravity models. For the analysis, we have created mock galaxy
No evidence for modifications of gravity from galaxy motions on cosmological scales
Current tests of general relativity (GR) remain confined to the scale of stellar systems or the strong gravity regime. A departure from GR on cosmological scales has been advocated1 as an alternative
A general framework to test gravity using galaxy clusters I : modelling the dynamical mass of haloes in f(R) gravity.
We propose a new framework for testing gravity using cluster observations, which aims to provide an unbiased constraint on modified gravity models from Sunyaev Zel’dovich (SZ) and X-ray cluster
Modeling halo mass functions in chameleon f(R) gravity
On cosmological scales, observations of the cluster abundance currently place the strongest constraints on f(R) gravity. These constraints lie in the large-field limit, where the modifications of
Modified Gravity-GADGET: A new code for cosmological hydrodynamical simulations of modified gravity models
We present a new massively parallel code for N-body and cosmological hydrodynamical simulations of modified gravity models. The code employs a multigrid-accelerated Newton-Gauss-Seidel relaxation
Scaling relations and mass bias in hydrodynamical f (R) gravity simulations of galaxy clusters
We investigate the impact of chameleon-type f(R) gravity models on the properties of galaxy clusters and groups. Our f(R) simulations follow for the first time also the hydrodynamics of the
The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
We introduce the Virgo Consortium's EAGLE project, a suite of hydrodynamical simulations that follow the formation of galaxies and black holes in representative volumes. We discuss the limitations of
Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
We study a class of metric-variation fRmodels that accelerates the expansion without a cosmological constant and satisfies both cosmological and solar-system tests in the small-field limit of the
Simulating galaxy formation with the IllustrisTNG model
We introduce an updated physical model to simulate the formation and evolution of galaxies in cosmological, large-scale gravity+magnetohydrodynamical simulations with the moving mesh code AREPO. The
First results from the IllustrisTNG simulations: matter and galaxy clustering
Hydrodynamical simulations of galaxy formation have now reached sufficient volume to make precision predictions for clustering on cosmologically relevant scales. Here we use our new IllustrisTNG