Degeneracies between Modified Gravity and Baryonic Physics

Abstract

In order to determine the observable signatures of modified gravity theories, it is important to consider the effect of baryonic physics. We use a modified version of the ISIS code to run cosmological hydrodynamic simulations to study degeneracies between modified gravity and radiative hydrodynamical processes. Of these, one was the standard $\Lambda$CDM model and four were variations of the Symmetron model. For each model we ran three variations of baryonic processes: non-radiative hydrodynamics; cooling and star formation; and cooling, star formation, and supernova feedback. We construct stacked gas density, temperature, and dark matter density profiles of the halos in the simulations, and study the differences between them. We find that both radiative variations of the models show degeneracies between their processes and at least two of the three parameters defining the Symmetron model.

arXiv comment9 pages, 4 figures, matches version accepted to A&A

References in corpus (45)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• The cosmological simulation code GADGET-2
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Modified Gravity and Cosmology
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Chameleon Fields: Awaiting Surprises for Tests of Gravity in Space
• Physical Models of Galaxy Formation in a Cosmological Framework
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• Cosmology and Fundamental Physics with the Euclid Satellite
• Modified f(R) gravity consistent with realistic cosmology: from matter dominated epoch to dark energy universe
• Ahf: Amiga's Halo Finder
• Symmetron Fields: Screening Long-Range Forces Through Local Symmetry Restoration
• The Cosmology of Generalized Modified Gravity Models
• Quintessence as a run-away dilaton
• The evolution substructure I: a new identification method
• Multiscale Gaussian Random Fields for Cosmological Simulations
• Large Scale Structure in Bekenstein's theory of relativistic Modified Newtonian Dynamics
• On the onset of galactic winds in quiescent star forming galaxies
• Revisiting the Cosmic Cooling Crisis
• ECOSMOG: An Efficient Code for Simulating Modified Gravity
• Modified Gravity-GADGET: A new code for cosmological hydrodynamical simulations of modified gravity models
• Screening Modifications of Gravity through Disformally Coupled Fields
• Vainshtein screening in a cosmological background in the most general second-order scalar-tensor theory
• Non-linear evolution of f(R) cosmologies I: methodology
• Initial Conditions for Large Cosmological Simulations
• The effects of baryon physics, black holes and AGN feedback on the mass distribution in clusters of galaxies
• Modified Gravity N-body Code Comparison Project
• Self-Consistent Cosmological Simulations of DGP Braneworld Gravity
• N-Body Simulations for Coupled Scalar Field Cosmology
• ISIS: a new N-body cosmological code with scalar fields based on RAMSES. Code presentation and application to the shapes of clusters
• Releasing scalar fields: cosmological simulations of scalar-tensor theories for gravity beyond the static approximation
• Testing chameleon gravity with the Coma cluster
• Structure Formation in the Symmetron Model
• The XMM Cluster Survey: Testing chameleon gravity using the profiles of clusters
• Structure Formation by Fifth Force I: N-Body vs. Linear Simulations
• Scaling relations and mass bias in hydrodynamical f(R) gravity simulations of galaxy clusters
• Systematic simulations of modified gravity: chameleon models
• The Vainshtein Mechanism in the Cosmic Web
• Environment Dependence of Dark Matter Halos in Symmetron Modified Gravity
• Hydrodynamic Effects in the Symmetron and $f(R)$-gravity Models
• Probing modified gravity via the mass-temperature relation of galaxy clusters
• Cosmological simulations with hydrodynamics of screened scalar-tensor gravity with non-universal coupling

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• Galaxy formation in the brane world I: overview and first results
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