scholarly journals New method of probing an oscillating EDM induced by axionlike dark matter using an rf Wien filter in storage rings

2021 ◽  
Vol 104 (9) ◽  
Author(s):  
On Kim ◽  
Yannis K. Semertzidis
Keyword(s):  
Dark Matter ◽  
Storage Rings ◽  
New Method ◽  
Wien Filter

scholarly journals New Method of Measuring Electric Dipole Moments in Storage Rings

2004 ◽  
Vol 93 (5) ◽  
Author(s):  
F. J. M. Farley ◽  
K. Jungmann ◽  
J. P. Miller ◽  
W. M. Morse ◽  
Y. F. Orlov ◽  
...  
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Storage Rings ◽  
New Method ◽  
Electric Dipole Moments

Mapping the dark matter of NGC 2974: Combination of stellar & cold gas kinematics

2019 ◽  
Vol 14 (S353) ◽  
pp. 253-254
Author(s):  
M. Yang ◽  
L. Zhu ◽  
A. Weijmans ◽  
G. van de Ven ◽  
N. F. Boardman ◽  
...  
Keyword(s):  
Dark Matter ◽  
New Method ◽  
Stellar Kinematics ◽  
Gas Kinematics ◽  
Superposition Technique ◽  
Cold Gas

AbstractWe present a new method to combine cold gas kinematics with the stellar kinematics modelled with the Schwarzschild orbit-superposition technique, and its application to the lenticular galaxy NGC 2974. The combination of stellar and cold gas kinematics significantly improves the constraints on the measured dark matter profile: assuming a generalised NFW halo profile, we find a cuspy inner halo slope for NGC 2974.

scholarly journals Inferring the dark matter velocity anisotropy to the cluster edge

2020 ◽  
Vol 500 (3) ◽  
pp. 3151-3161
Author(s):  
Jacob Svensmark ◽  
Steen H Hansen ◽  
Davide Martizzi ◽  
Ben Moore ◽  
Romaine Tessier
Keyword(s):  
Dark Matter ◽  
Numerical Simulations ◽  
Galaxy Cluster ◽  
Dynamical Property ◽  
Large Error ◽  
New Method ◽  
Bright Galaxy ◽  
X Ray ◽  
Velocity Anisotropy ◽  
Error Bars

ABSTRACT Dark matter (DM) dominates the properties of large cosmological structures such as galaxy clusters, and the mass profiles of the DM have been inferred for these equilibrated structures for years by using cluster X-ray surface brightnesses and temperatures. A new method has been proposed, which should allow us to infer a dynamical property of the DM, namely the velocity anisotropy. For the gas, a similar velocity anisotropy is zero due to frequent collisions; however, the collisionless nature of DM allows it to be non-trivial. Numerical simulations have for years found non-zero and radially varying DM velocity anisotropies. Here we employ the method proposed by Hansen & Piffaretti, and developed by Høst et al. to infer the DM velocity anisotropy in the bright galaxy cluster Perseus, to near five times the radii previously obtained. We find the DM velocity anisotropy to be consistent with the results of numerical simulations, however, still with large error bars. At half the virial radius, we find the DM velocity anisotropy to be non-zero at 1.7$\, \sigma$, lending support to the collisionless nature of DM.

West will feel the force of China's space programme

2015 ◽  
Keyword(s):  
United States ◽  
Developing Countries ◽  
Dark Matter ◽  
The United States ◽  
Space Science ◽  
Earth Observation ◽  
Cutting Edge ◽  
New Method ◽  
Content Type ◽  
Set Up

Subject China's space warfare capabilities. Significance China on December 17 launched a satellite that will test a new method for detecting dark matter -- the first of a series of five missions that put China at the cutting edge of space science. Separately, Beijing and Washington last month set up a 'space hotline' to reduce the risk of conflict in space -- an agreement representing acknowledgement of China's space capabilities and the challenge they pose to US strategic and tactical superiority. Impacts China still lags the United States significantly, but is eroding US dominance. Space capabilities will be integral to the success of China's 'anti-access/area denial' strategy. Earth observation and navigation satellites will support civilian enforcement of China's maritime claims. China will seek space collaboration with other developing countries.

scholarly journals Subhalo destruction in the Apostle and Auriga simulations

2019 ◽  
Vol 492 (4) ◽  
pp. 5780-5793 ◽  
Author(s):  
Jack Richings ◽  
Carlos Frenk ◽  
Adrian Jenkins ◽  
Andrew Robertson ◽  
Azadeh Fattahi ◽  
...  
Keyword(s):  
Dark Matter ◽  
Velocity Distribution ◽  
Galaxy Formation ◽  
Milky Way ◽  
State Of The Art ◽  
Systematic Errors ◽  
Mass Function ◽  
New Method ◽  
The Galaxy

ABSTRACT N-body simulations make unambiguous predictions for the abundance of substructures within dark matter haloes. However, the inclusion of baryons in the simulations changes the picture because processes associated with the presence of a large galaxy in the halo can destroy subhaloes and substantially alter the mass function and velocity distribution of subhaloes. We compare the effect of galaxy formation on subhalo populations in two state-of-the-art sets of hydrodynamical Λcold dark matter (ΛCDM) simulations of Milky Way mass haloes, Apostle and Auriga. We introduce a new method for tracking the orbits of subhaloes between simulation snapshots that gives accurate results down to a few kiloparsecs from the centre of the halo. Relative to a dark matter-only simulation, the abundance of subhaloes in Apostle is reduced by 50 per cent near the centre and by 10 per cent within r200. In Auriga, the corresponding numbers are 80 per cent and 40 per cent. The velocity distributions of subhaloes are also affected by the presence of the galaxy, much more so in Auriga than in Apostle. The differences on subhalo properties in the two simulations can be traced back to the mass of the central galaxies, which in Auriga are typically twice as massive as those in Apostle. We show that some of the results from previous studies are inaccurate due to systematic errors in the modelling of subhalo orbits near the centre of haloes.

scholarly journals New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments

2015 ◽  
Vol 115 (9) ◽  
Author(s):  
D. Eversmann ◽  
V. Hejny ◽  
F. Hinder ◽  
A. Kacharava ◽  
J. Pretz ◽  
...  
Keyword(s):  
Storage Rings ◽  
New Method ◽  
Continuous Determination

The Effects of Spatial Correlations on Merger Trees of Dark Matter Halos

1999 ◽  
Vol 186 ◽  
pp. 484-484
Author(s):  
Masahiro Nagashima ◽  
Naoteru Gouda
Keyword(s):  
Dark Matter ◽  
Density Fluctuations ◽  
New Method ◽  
Dark Matter Halos ◽  
Spatial Correlations ◽  
Block Model ◽  
The Press ◽  
Mass Functions ◽  
Grid Based

The effects of spatial correlations of density fluctuations on merger histories of dark matter halos (so-called ‘merger trees’) are analyzed (Nagashima & Gouda 1997). We compare the mass functions of dark haloes derived by a new method for calculating merger trees, that proposed by Rodrigues & Thomas (1996), with those given by other methods such as the Block model, the Press-Schechter formula and our own formula in which the mass functions are analytically expressed in a way that takes into consideration the spatial correlations (Yano et al. 1996). It is found that the mass functions given by the new method are well fit by those given by our formula. We believe that the new method naturally and correctly takes into account the spatial correlations of the density fluctuations due to a calculated, grid-based realization of the density fluctuations, and so is very useful for estimating the merger tree accurately in a way that takes into consideration spatial correlations.

scholarly journals Modeling dark haloes in early-type galaxies: stellar kinematics at large radii

2009 ◽  
Vol 5 (H15) ◽  
pp. 69-69 ◽  
Author(s):  
Anne-Marie Weijmans
Keyword(s):  
Dark Matter ◽  
Absorption Line ◽  
New Method ◽  
Dark Matter Halo ◽  
Early Type ◽  
Stellar Kinematics ◽  
Signal To Noise ◽  
Stellar Halo ◽  
Halo Population ◽  
Integral Field

We developed a new method to obtain absorption line spectra of early-type galaxies at large radii, using integral-field spectrography (IFS). By using the spectrograph as a 'photon-collector' and adding the signal of many individual spaxels together in one spectrum, we obtain sufficient signal-to-noise to measure both stellar kinematics and line strengths at large radii. These can be used to determine the properties of the dark matter halo, as well as the stellar halo population.

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