CAN COUPLED DARK ENERGY SPEED UP THE BULLET CLUSTER

@article{Lee2012CANCD,
  title={CAN COUPLED DARK ENERGY SPEED UP THE BULLET CLUSTER},
  author={Jounghun Lee and Marco Baldi},
  journal={The Astrophysical Journal},
  year={2012},
  volume={747},
  pages={45}
}
It has been recently shown that the observed morphological properties of the Bullet Cluster can be accurately reproduced in hydrodynamical simulations only when the infall pairwise velocity V{sub c} of the system exceeds 3000 km s{sup -1} (or at least possibly 2500 km s{sup -1}) at the pair separation of 2R{sub vir}, where R{sub vir} is the virial radius of the main cluster, and that the probability of finding such a bullet-like system is extremely low in the standard {Lambda} cold dark matter… Expand

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References

SHOWING 1-10 OF 41 REFERENCES
Bullet Cluster: A Challenge to ΛCDM Cosmology
To quantify how rare the bullet-cluster-like high-velocity merging systems are in the standard {Lambda} cold dark matter (CDM) cosmology, we use a large-volume (27 h {sup -3} Gpc{sup 3}) cosmologicalExpand
Can Modified Gravity (MOG) explain the speeding Bullet (Cluster)
We apply our scalar-tensor-vector (STVG) modified gravity theory (MOG) to calculate the infall velocities of the two clusters constituting the Bullet Cluster 1E0657-06. In the absence of anExpand
Pairwise velocities of dark matter haloes: a test for the Λ cold dark matter model using the bullet cluster
The existence of a bullet cluster (such as 1E 0657−56) poses a challenge to the concordance Λ cold dark matter (ΛCDM) model. Here we investigate the velocity distribution of dark matter (DM) haloExpand
The speed of the ‘bullet’ in the merging galaxy cluster 1E0657−56
Deep Chandra exposures of the hot galaxy cluster 1E0657-56 have revealed a highly dynamical state of the system due to an ongoing merger with a massive subcluster. The system is observed shortlyExpand
Simulating the Bullet Cluster
We present high resolution N-body/smoothed particle hydrodynamics (SPH) simulations of the interacting cluster 1E0657-56. The main and the subcluster are modelled using extended cuspy Acold darkExpand
Bullet Clusters in the MareNostrum Universe
We estimate the expected distribution of displacements between the dark matter and gas cores in simulated clusters. We use the MareNostrum Universe, one of the largest non radiative, SPH Lambda CDMExpand
Early massive clusters and the bouncing coupled dark energy
ABSTRACT The abundance of the most massive objects in the Universe at different epochs is avery sensitive probe of the cosmic background evolution and of the growth history of densityperturbations,Expand
Direct Constraints on the Dark Matter Self-Interaction Cross Section from the Merging Galaxy Cluster 1E 0657–56
We compare new maps of the hot gas, dark matter, and galaxies for 1E 0657-56, a cluster with a rare, high-velocity merger occurring nearly in the plane of the sky. The X-ray observations reveal aExpand
Hydrodynamical N-body simulations of coupled dark energy cosmologies
If the accelerated expansion of the Universe at the present epoch is driven by a dark energy scalar field, there may well be a non-trivial coupling between the dark energy and the cold dark matterExpand
Mass functions in coupled dark energy models
We evaluate the mass function of virialized halos, by using Press and Schechter (PS) and/or Steth and Tormen (ST) expressions, for cosmologies where dark energy (DE) is due to a scalarExpand
...
1
2
3
4
5
...