scholarly journals Determining the dark matter particle mass through antler topology processes at lepton colliders

2014 ◽  
Vol 90 (11) ◽  
Author(s):  
Neil D. Christensen ◽  
Tao Han ◽  
Zhuoni Qian ◽  
Josh Sayre ◽  
Jeonghyeon Song ◽  
...  
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Particle Mass ◽  
Lepton Colliders

scholarly journals Energy equipartition between stellar and dark matter particles in cosmological simulations results in spurious growth of galaxy sizes

2019 ◽  
Vol 488 (1) ◽  
pp. L123-L128 ◽  
Author(s):  
Aaron D Ludlow ◽  
Joop Schaye ◽  
Matthieu Schaller ◽  
Jack Richings
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Mass Resolution ◽  
Particle Mass ◽  
Cosmological Simulations ◽  
Massive Particles ◽  
Energy Equipartition ◽  
Mass Segregation ◽  
Baryonic Mass ◽  
The Impact

ABSTRACTThe impact of 2-body scattering on the innermost density profiles of dark matter haloes is well established. We use a suite of cosmological simulations and idealized numerical experiments to show that 2-body scattering is exacerbated in situations where there are two species of unequal mass. This is a consequence of mass segregation and reflects a flow of kinetic energy from the more to less massive particles. This has important implications for the interpretation of galaxy sizes in cosmological hydrodynamic simulations, which nearly always model stars with less massive particles than are used for the dark matter. We compare idealized models as well as simulations from the eagle project that differ only in the mass resolution of the dark matter component, but keep subgrid physics, baryonic mass resolution, and gravitational force softening fixed. If the dark matter particle mass exceeds the mass of stellar particles, then galaxy sizes – quantified by their projected half-mass radii, R50 – increase systematically with time until R50 exceeds a small fraction of the redshift-dependent mean interparticle separation, l (${\rm R_{50}} \gtrsim 0.05\times l$). Our conclusions should also apply to simulations that adopt different hydrodynamic solvers, subgrid physics, or adaptive softening, but in that case may need quantitative revision. Any simulation employing a stellar-to-dark matter particle mass ratio greater than unity will escalate spurious energy transfer from dark matter to baryons on small scales.

scholarly journals A Limit on the Warm Dark Matter Particle Mass from the Redshifted 21 cm Absorption Line

2018 ◽  
Vol 859 (2) ◽  
pp. L18 ◽  
Author(s):  
Mohammadtaher Safarzadeh ◽  
Evan Scannapieco ◽  
Arif Babul
Keyword(s):  
Dark Matter ◽  
Absorption Line ◽  
Dark Matter Particle ◽  
Particle Mass

scholarly journals Constraining the warm dark matter particle mass with Milky Way satellites

2014 ◽  
Vol 442 (3) ◽  
pp. 2487-2495 ◽  
Author(s):  
Rachel Kennedy ◽  
Carlos Frenk ◽  
Shaun Cole ◽  
Andrew Benson
Keyword(s):  
Dark Matter ◽  
Milky Way ◽  
Dark Matter Particle ◽  
Particle Mass

scholarly journals CONSTRAINING THE WARM DARK MATTER PARTICLE MASS THROUGH ULTRA-DEEP UV LUMINOSITY FUNCTIONS ATz= 2

2016 ◽  
Vol 818 (1) ◽  
pp. 90 ◽  
Author(s):  
N. Menci ◽  
N. G. Sanchez ◽  
M. Castellano ◽  
A. Grazian
Keyword(s):  
Dark Matter ◽  
Dark Matter Particle ◽  
Particle Mass ◽  
Luminosity Functions ◽  
Deep Uv

scholarly journals Detecting Cold Dark Matter Candidates

1987 ◽  
Vol 117 ◽  
pp. 490-490
Author(s):  
A. K. Drukier ◽  
K. Freese ◽  
D. N. Spergel
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Galactic Halo ◽  
Dark Matter Particle ◽  
Low Energy ◽  
The Sun ◽  
Background Rate ◽  
System Noise ◽  
Weakly Interacting ◽  
Massive Neutrinos

We consider the use of superheated superconducting colloids as detectors of weakly interacting galactic halo candidate particles (e.g. photinos, massive neutrinos, and scalar neutrinos). These low temperature detectors are sensitive to the deposition of a few hundreds of eV's. The recoil of a dark matter particle off of a superheated superconducting grain in the detector causes the grain to make a transition to the normal state. Their low energy threshold makes this class of detectors ideal for detecting massive weakly interacting halo particles.We discuss realistic models for the detector and for the galactic halo. We show that the expected count rate (≈103 count/day for scalar and massive neutrinos) exceeds the expected background by several orders of magnitude. For photinos, we expect ≈1 count/day, more than 100 times the predicted background rate. We find that if the detector temperature is maintained at 50 mK and the system noise is reduced below 5 × 10−4 flux quanta, particles with mass as low as 2 GeV can be detected. We show that the earth's motion around the Sun can produce a significant annual modulation in the signal.

scholarly journals Relativistic impulse approximation in the atomic ionization process induced by millicharged particles

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Chen-Kai Qiao ◽  
Shin-Ted Lin ◽  
Hsin-Chang Chi ◽  
Hai-Tao Jia
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Direct Detection ◽  
Impulse Approximation ◽  
Dark Matter Particle ◽  
Ionization Process ◽  
Beyond The Standard Model ◽  
Next Generation ◽  
Many Body ◽  
Atomic Ionization

Abstract The millicharged particle has become an attractive topic to probe physics beyond the Standard Model. In direct detection experiments, the parameter space of millicharged particles can be constrained from the atomic ionization process. In this work, we develop the relativistic impulse approximation (RIA) approach, which can duel with atomic many-body effects effectively, in the atomic ionization process induced by millicharged particles. The formulation of RIA in the atomic ionization induced by millicharged particles is derived, and the numerical calculations are obtained and compared with those from free electron approximation and equivalent photon approximation. Concretely, the atomic ionizations induced by mllicharged dark matter particles and millicharged neutrinos in high-purity germanium (HPGe) and liquid xenon (LXe) detectors are carefully studied in this work. The differential cross sections, reaction event rates in HPGe and LXe detectors, and detecting sensitivities on dark matter particle and neutrino millicharge in next-generation HPGe and LXe based experiments are estimated and calculated to give a comprehensive study. Our results suggested that the next-generation experiments would improve 2-3 orders of magnitude on dark matter particle millicharge δχ than the current best experimental bounds in direct detection experiments. Furthermore, the next-generation experiments would also improve 2-3 times on neutrino millicharge δν than the current experimental bounds.

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