scholarly journals Modeling of inelastic collisions in a multifluid plasma: Excitation and deexcitation

2015 ◽  
Vol 22 (9) ◽  
pp. 093512 ◽  
Author(s):  
Hai P. Le ◽  
Jean-Luc Cambier
Keyword(s):  
Inelastic Collisions ◽  
Plasma Excitation ◽  
Multifluid Plasma

scholarly journals The impact of inelastic self-interacting dark matter on the dark matter structure of a Milky Way halo

2020 ◽  
Author(s):  
Kun Ting Eddie Chua ◽  
Karia Dibert ◽  
Mark Vogelsberger ◽  
Jesús Zavala
Keyword(s):  
Dark Matter ◽  
High Speed ◽  
Cold Dark Matter ◽  
Milky Way ◽  
Direct Detection ◽  
Major Axis ◽  
Inelastic Collisions ◽  
Axis Ratio ◽  
Lower Velocity ◽  
The Impact

Abstract We study the effects of inelastic dark matter self-interactions on the internal structure of a simulated Milky Way (MW)-size halo. Self-interacting dark matter (SIDM) is an alternative to collisionless cold dark matter (CDM) which offers a unique solution to the problems encountered with CDM on sub-galactic scales. Although previous SIDM simulations have mainly considered elastic collisions, theoretical considerations motivate the existence of multi-state dark matter where transitions from the excited to the ground state are exothermic. In this work, we consider a self-interacting, two-state dark matter model with inelastic collisions, implemented in the Arepo code. We find that energy injection from inelastic self-interactions reduces the central density of the MW halo in a shorter timescale relative to the elastic scale, resulting in a larger core size. Inelastic collisions also isotropize the orbits, resulting in an overall lower velocity anisotropy for the inelastic MW halo. In the inner halo, the inelastic SIDM case (minor-to-major axis ratio s ≡ c/a ≈ 0.65) is more spherical than the CDM (s ≈ 0.4), but less spherical than the elastic SIDM case (s ≈ 0.75). The speed distribution f(v) of dark matter particles at the location of the Sun in the inelastic SIDM model shows a significant departure from the CDM model, with f(v) falling more steeply at high speeds. In addition, the velocity kicks imparted during inelastic collisions produce unbound high-speed particles with velocities up to 500 km s−1 throughout the halo. This implies that inelastic SIDM can potentially leave distinct signatures in direct detection experiments, relative to elastic SIDM and CDM.

Crossover from proximity to ordinary two-dimensional plasma excitation

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
V. M. Muravev ◽  
I. V. Andreev ◽  
N. D. Semenov ◽  
S. I. Gubarev ◽  
I. V. Kukushkin
Keyword(s):  
Two Dimensional ◽  
Plasma Excitation

scholarly journals Inelastic collisions in radiofrequency-dressed mixtures of ultracold atoms

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Elliot Bentine ◽  
Adam J. Barker ◽  
Kathrin Luksch ◽  
Shinichi Sunami ◽  
Tiffany L. Harte ◽  
...  
Keyword(s):  
Ultracold Atoms ◽  
Inelastic Collisions

Motion periodicity and bifurcation of a wave excited hopping ball

2019 ◽  
Vol 475 (2228) ◽  
pp. 20190137
Author(s):  
Gaurang Ruhela ◽  
Anirvan DasGupta
Keyword(s):  
Wave Amplitude ◽  
Harmonic Wave ◽  
Inelastic Collisions ◽  
Loss Of Stability ◽  
Elastic Surface ◽  
Minimum Frequency ◽  
Surface Motion ◽  
Return Map ◽  
Ball Problem ◽  
Subsequent Loss

We consider the problem of a hopping ball excited by a travelling harmonic wave on an elastic surface. The ball, considered as a particle, is assumed to interact with the surface through inelastic collisions. The surface motion due to the wave induces a horizontal drift in the ball. The problem is treated analytically under certain approximations. The phase space of the hopping motion is captured by constructing a phase-velocity return map. The fixed points of the return map and its compositions represent periodic hopping solutions. The linear stability of the obtained periodic solution is studied in detail. The minimum frequency for the onset of periodic hops, and the subsequent loss of stability at the bifurcation frequency, have been determined analytically. Interestingly, for small values of wave amplitude, the analytical solutions reveal striking similarities with the results of the classical bouncing ball problem.

Reciprocity relations in an isotropic compressible multifluid plasma

1976 ◽  
Vol 47 (7) ◽  
pp. 2918-2922 ◽  
Author(s):  
Takayuki Ishizone ◽  
Saburo Adachi ◽  
Yasuto Mushiake
Keyword(s):  
Reciprocity Relations ◽  
Multifluid Plasma
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