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7 papers · 2 filters
The Mass Distribution of the Unusual Merging Cluster Abell 2146 from Strong Lensing
Joseph E. Coleman, Lindsay J. King, Masamune Oguri +11
Abell 2146 consists of two galaxy clusters that have recently collided close to the plane of the sky, and it is unique in showing two large shocks on $\textit{Chandra X-ray Observa…
The Distribution of Dark and Luminous Matter in the Unique Galaxy Cluster Merger Abell 2146
Lindsay J. King, Douglas I. Clowe, Joseph E. Coleman +9
Abell 2146 ( = 0.232) consists of two galaxy clusters undergoing a major merger. The system was discovered in previous work, where two large shock fronts were detected using the…
The Future of Primordial Features with Large-Scale Structure Surveys
Xingang Chen, Cora Dvorkin, Zhiqi Huang +2
Primordial features are one of the most important extensions of the Standard Model of cosmology, providing a wealth of information on the primordial universe, ranging from discrimi…
The Future of Primordial Features with 21 cm Tomography
Xingang Chen, P. Daniel Meerburg, Moritz Münchmeyer
Detecting a deviation from a featureless primordial power spectrum of fluctuations would give profound insight into the physics of the primordial Universe. Depending on their natur…
Testing gravity theories using tensor perturbations
Weikang Lin, Mustapha Ishak
Primordial gravitational waves constitute a promising probe of the very early Universe and the laws of gravity. We study in this work changes to tensor-mode perturbations (TMPs) th…
Averaged universe confronted with cosmological observations: A fully covariant approach
Tharake Wijenayake, Weikang Lin, Mustapha Ishak
One of the outstanding problems in general relativistic cosmology is that of the averaging. That is, how the lumpy universe that we observe at small scales averages out to a smooth…
Ultra faint dwarf galaxies: an arena for testing dark matter versus modified gravity
Weikang Lin, Mustapha Ishak
The scenario consistent with a wealth of observations for the missing mass problem is that of weakly interacting dark matter particles. However, arguments or proposals for a Newton…