Splashback radius in symmetron gravity

@article{Contigiani2019SplashbackRI,
  title={Splashback radius in symmetron gravity},
  author={Omar Contigiani and Valeri Vardanyan and Alessandra Silvestri},
  journal={Physical Review D},
  year={2019}
}
The splashback radius rsp has been identified in cosmological N-body simulations as an important scale associated with gravitational collapse and the phase-space distribution of recently accreted material. We employ a semianalytical approach to study the spherical collapse of dark matter halos in symmetron gravity and provide, for the first time, insights into how the phenomenology of splashback is affected by modified gravity. The symmetron is a scalar-tensor theory which exhibits a screening… 

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References

SHOWING 1-10 OF 57 REFERENCES
Symmetron Cosmology
The symmetron is a scalar field associated with the dark sector whose coupling to matter depends on the ambient matter density. The symmetron is decoupled and screened in regions of high density,
Splashback in galaxy clusters as a probe of cosmic expansion and gravity
The splashback radius is a physical scale in dark matter halos that is set by the gravitational dynamics of recently accreted shells. We use analytical models and N-body simulations to study the
Spherical collapse in chameleon models
We study the gravitational collapse of an overdensity of nonrelativistic matter under the action of gravity and a chameleon scalar field. We show that the spherical collapse model is modified by the
Self-similar solutions of triaxial dark matter halos
We investigate the collapse and the internal structure of dark matter halos. We consider halo formation from initially scale-free perturbations, for which gravitational collapse is self-similar.
Systematic Simulations of Modified Gravity: Symmetron and Dilaton Models
We study the linear and nonlinear structure formation in the dilaton and symmetron models of modified gravity using a generic parameterisation which describes a large class of scenarios using only a
Stellar kinematics from the symmetron fifth force in the Milky Way disk
It has been shown that the presence of non-minimally coupled scalar fields giving rise to a fifth force can noticeably alter dynamics on galactic scales. Such a fifth force must be screened in the
Spherical collapse in modified gravity with the Birkhoff theorem
We study structure formation in a phenomenological model of modified gravity which interpolates between Acold dark mtter (ACDM) and Dvali-Gabadadze-Porrati (DGP) gravity. In our model, the Friedmann
Weak lensing constraints on splashback around massive clusters
The splashback radius $r_\text{sp}$ separates the physical regimes of collapsed and infalling material around massive dark matter haloes. In cosmological simulations, this location is associated with
The Splashback Feature around DES Galaxy Clusters: Galaxy Density and Weak Lensing Profiles
Splashback refers to the process of matter that is accreting onto a dark matter halo reaching its first orbital apocenter and turning around in its orbit. The clustercentric radius at which this
Halo scale predictions of symmetron modified gravity
We offer predictions of symmetron modified gravity in the neighborhood of realistic dark matter halos. The predictions for the fifth force are obtained by solving the nonlinear symmetron equation of
...
1
2
3
4
5
...