Current status of weak gravitational lensing

Hoekstra, Henk; Yee, H. K. C.; Gladders, Michael D.

doi:10.1016/s1387-6473(02)00245-2

Cited by 81 publications

(103 citation statements)

References 79 publications

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“…where is the distance from the point mass, E is the Einstein radius for the lens, 0 is the distance at which the gravitational acceleration changes from Newtonian to MOND, and out is the distance at which the gravitational acceleration changes back to a À2 law (Mortlock & Turner 2001;Hoekstra et al 2002). Since both E and 0 scale as the square root of the point mass, the resulting shear profile scales linearly with the mass for T 0 and 3 out , as the square root of the mass for 0 TT out , and somewhere between the two extremes for the transitional regions, $ 0 and $ out .…”

Section: Discussionmentioning

confidence: 99%

“…This idea of modified Newtonian dynamics (MOND) has been used to reproduce the observed rotation velocities of spiral galaxies without inclusion of any dark matter (e.g., McGaugh & de Blok 1998) and could also explain the observed velocity dispersions and X-ray temperatures of clusters without needing any additional matter beyond the observed baryons and a small neutrino mass (Sanders 2003). Several arguments against MOND have been made using gravitational lensing observations of galaxies and clusters (Gavazzi 2002;Hoekstra, Yee, & Gladders 2002;Mortlock & Turner 2001), but because of the lack of a general relativistic theory giving the strength of the interaction between light and gravity in the MOND regime, these observations can be explained by alterations in the MOND formalism (Sanders & McGaugh 2002).…”

Section: Introductionmentioning

confidence: 99%

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Weak‐Lensing Mass Reconstruction of the Interacting Cluster 1E 0657−558: Direct Evidence for the Existence of Dark Matter

Clowe

Gonzalez

Markevitch

2004

ApJ

593

665

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We present a weak-lensing mass reconstruction of the interacting cluster 1E 0657À558, in which we detect both the main cluster and a subcluster. The subcluster is identified as a smaller cluster that has just undergone initial infall and pass-through of the primary cluster and has been previously identified in both optical surveys and X-ray studies. The X-ray gas has been separated from the galaxies by ram pressure-stripping during the pass-through. The detected mass peak is located between the X-ray peak and galaxy concentration, although the position is consistent with the galaxy centroid within the errors of the mass reconstruction. We find that the mass peak for the main cluster is in good spatial agreement with the cluster galaxies and is offset from the X-ray halo at 3.4 significance, and we determine that the mass-to-light ratios of the two components are consistent with those of relaxed clusters. The observed offsets of the lensing mass peaks from the peaks of the dominant visible mass component (the X-ray gas) directly demonstrate the presence, and dominance, of dark matter in this cluster. This proof of dark matter existence holds true even under the assumption of modified Newtonian dynamics (MOND); based on the observed gravitational shear-optical light ratios and the mass peak-X-ray gas offsets, the dark matter component in a MOND regime would have a total mass that is at least equal to the baryonic mass of the system.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Weak‐Lensing Mass Reconstruction of the Interacting Cluster 1E 0657−558: Direct Evidence for the Existence of Dark Matter

Clowe

Gonzalez

Markevitch

2004

ApJ

593

665

View full text Add to dashboard Cite

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“…Thanks to velocity dispersion techniques, it now appears that spiral galaxies are associated with dark halos which extend out to 200 kPc from the galactic centre, which is well beyond all of the visible matter. Other techniques have also been developed, and gravitational lensing experiments have made observations which cannot be accounted for by the visible matter content [19].…”

Section: Galactic Scalesmentioning

confidence: 99%

Searching for Dark Matter with the ATLAS Detector

Schramm

2017

Springer Theses

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Hadron colliders, such as the Large Hadron Collider (LHC), principally produce events involving hadronic activity. Such activity is typically modelled by jets, which provide a useful representation of the underlying physics. Given the ubiquity of jets in LHC events, it becomes important to ensure that their properties and performance are well understood. The full approach to jet reconstruction and calibration, as used by the ATLAS Experiment, is detailed with a focus on recent improvements. The systematic uncertainties associated with jets are quantified, with the procedures and resulting reductions in uncertainties thoroughly detailed. Extra attention is placed on the treatment of high energy jets, and particularly the impact of inactive calorimeter regions and calorimeter non-containment (punch-through).The mono-jet topology is presented as an analysis where high energy jets are particularly relevant.This search makes use of very high missing transverse momentum balanced purely by jets, enabling measurements of the production cross-section of new physics processes producing weakly interacting particles. The full Standard Model background determination is shown, and the data are seen to be consistent with the Standard Model expectations. Limits are set on the visible cross-section for new physics processes.The results are interpreted as a search for the pair-production of Dark Matter (DM), both through Effective Field Theories (EFTs) and simplified models. Scenarios where the DM is either a scalar or fermionic particle are both considered. The validity of the EFT approach is thoroughly investigated, providing the first complete collider study into all relevant interaction types. Limits are then set on the EFT suppression scale, the WIMP-nucleon scattering cross-section, and the WIMP annihilation cross-section in order to compare with other types of DM experiments. The simplified model is used to conduct a full parameter-space scan of the mono-jet sensitivity to a wide range of conditions. First projections for the mono-jet analysis at an upgraded LHC are presented, demonstrating the significant gain in both discovery potential and limit sensitivity that accompanies higher collision energies. The analysis is projected to double in sensitivity in the coming year, hinting at the exciting times to come.ii

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“…Cosmic shear experiments may be broadly divided into two categories (for useful reviews see Hoekstra, Yee, & Gladders 2002;Refregier 2003 Bacon et al 2003). In 10-15 years, cosmic shear surveys will cover the whole sky and will have the power to characterize the properties of the dark energy and matter as a function of redshift.…”

Section: Cosmic Shearmentioning

confidence: 99%

Science Programs for a 2-m Class Telescope at Dome C, Antarctica: PILOT, the Pathfinder for an International Large Optical Telescope

Burton

Lawrence

Ashley

et al. 2005

Publ. – Astron. Soc. Aust

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Abstract:The cold, dry, and stable air above the summits of the Antarctic plateau provides the best groundbased observing conditions from optical to sub-millimetre wavelengths to be found on the Earth. Pathfinder for an International Large Optical Telescope (PILOT) is a proposed 2 m telescope, to be built at Dome C in Antarctica, able to exploit these conditions for conducting astronomy at optical and infrared wavelengths. While PILOT is intended as a pathfinder towards the construction of future grand-design facilities, it will also be able to undertake a range of fundamental science investigations in its own right. This paper provides the performance specifications for PILOT, including its instrumentation. It then describes the kinds of projects that it could best conduct. These range from planetary science to the search for other solar systems, from star formation within the Galaxy to the star formation history of the Universe, and from gravitational lensing caused by exo-planets to that produced by the cosmic web of dark matter. PILOT would be particularly powerful for wide-field imaging at infrared wavelengths, achieving near diffraction-limited performance with simple tip-tilt wavefront correction. PILOT would also be capable of near diffraction-limited performance in the optical wavebands, as well be able to open new wavebands for regular ground-based observation, in the mid-IR from 17 to 40 µm and in the sub-millimetre at 200 µm.

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Current status of weak gravitational lensing

Cited by 81 publications

References 79 publications

Weak‐Lensing Mass Reconstruction of the Interacting Cluster 1E 0657−558: Direct Evidence for the Existence of Dark Matter

Weak‐Lensing Mass Reconstruction of the Interacting Cluster 1E 0657−558: Direct Evidence for the Existence of Dark Matter

Searching for Dark Matter with the ATLAS Detector

Science Programs for a 2-m Class Telescope at Dome C, Antarctica: PILOT, the Pathfinder for an International Large Optical Telescope

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