Galaxy infall kinematics as a test of modified gravity

@article{Zu2014GalaxyIK,
  title={Galaxy infall kinematics as a test of modified gravity},
  author={Ying Zu and David H. Weinberg and Elise Jennings and Baojiu Li and Mark Wyman},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={445},
  pages={1885-1897}
}
  • Y. Zu, D. Weinberg, M. Wyman
  • Published 24 October 2013
  • Physics
  • Monthly Notices of the Royal Astronomical Society
Infrared modifications of General Relativity (GR) can be revealed by comparing the mass of galaxy clusters estimated from weak lensing to that from infall kinematics. We measure the 2D galaxy velocity distribution in the cluster infall region by applying the galaxy infall kinematics (GIK) model developed by Zu and Weinberg (2013) to two suites of f(R) and Galileon modified gravity simulations. Despite having distinct screening mechanisms, namely, the Chameleon and the Vainshtein effects, the f… 

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References

SHOWING 1-10 OF 100 REFERENCES

The redshift-space cluster–galaxy cross-correlation function – I. Modelling galaxy infall on to Millennium simulation clusters and SDSS groups

The large scale infall of galaxies around massive clusters provides a potentially powerful diagnostic of structure growth, dark energy, and cosmological deviations from General Relativity. We develop

Tests of modified gravity with dwarf galaxies

In modified gravity theories that seek to explain cosmic acceleration, dwarf galaxies in low density environments can be subject to enhanced forces. The class of scalar-tensor theories, which

Confirmation of general relativity on large scales from weak lensing and galaxy velocities

TLDR
A test of the applicability of general relativity on cosmological length scales using a quantity that combines measures of large-scale gravitational lensing, galaxy clustering and structure growth rate, reports that EG = 0.39 ± 0.06 on length scales of tens of megaparsecs, in agreement with the general relativistic prediction.

Understanding the halo-mass and galaxy-mass cross-correlation functions

We use the Millennium Simulation (MS) to measure the cross-correlation between halo centres and mass (or equivalently the average density profiles of dark haloes) in a Lambda cold dark matter (ACDM)

Virial scaling of galaxies in clusters: bright to faint is cool to hot

By combining galaxy tracers from high-resolution N-body and hydrodynamical simulations, we present a consistent picture of the behaviour of galaxy velocities in massive clusters. In haloes above ~

Density profiles of galaxy groups and clusters from SDSS galaxy–galaxy weak lensing

We present results of a measurement of the shape of the density profile of galaxy groups and clusters traced by 43 335 Luminous Red Galaxies (LRGs) with spectroscopic redshifts from the Sloan Digital

CROSS-CORRELATION WEAK LENSING OF SDSS GALAXY CLUSTERS. I. MEASUREMENTS

This is the first in a series of papers on the weak lensing effect caused by clusters of galaxies in Sloan Digital Sky Survey. The photometrically selected cluster sample, known as MaxBCG, includes

Redshift-space distortions with the halo occupation distribution – II. Analytic model

We present an analytic model for the galaxy two-point correlation function in redshift space. The cosmological parameters of the model are the matter density Ω m , power spectrum normalization σ 8 ,

Redshift-space distortions in f(R) gravity

We use large-volume N-body simulations to predict the clustering of dark matter in redshift space in f(R) modified gravity cosmologies. This is the first time that the non-linear matter and velocity

Testing gravity with the stacked phase space around galaxy clusters.

TLDR
This work proposes a new method of measuring the velocity field (phase space density) by stacking redshifts of surrounding galaxies from a spectroscopic sample and shows that this method can improve upon current constraints on f(R) and Dvali-Gabadadze-Porrati model parameters by several orders of magnitude when applied to upcoming imaging and redshift surveys.
...