Numerical Studies of Cosmic Ray Injection and Acceleration (2002)
Kang, Hyesung, Jones, T. W., Gieseler, U. D. J.
A numerical scheme that incorporates a thermal leakage injection model into a combined gas dynamics and cosmic ray (CR, hereafter) diffusion-convection code has been developed. The particle injection...
Time dependent cosmic-ray shock acceleration with self-consistent injection (2000)
Gieseler, U. D. J., Jones, T. W., Kang, Hyesung
One of the key questions to understanding the efficiency of diffusive shock acceleration of the cosmic rays (CRs) is the injection process from thermal particles. A self-consistent injection model...
First order Fermi acceleration at multiple oblique shocks (2000)
Gieseler, U. D. J., Jones, T. W.
Numerical results for particle acceleration at multiple oblique shocks are presented. We calculate the steady state spectral slope of test particles accelerated by the first order Fermi process. The...
Monte-Carlo simulation of particle acceleration in braided magnetic fields (1999)
Gieseler, U. D. J., Kirk, J. G.
Supernova remnants are expected to contain braided (or stochastic) magnetic fields, which are in some regions directed mainly perpendicular to the shock normal. For particle acceleration due to...
Ion injection and acceleration at modified shocks (1999)
Gieseler, U. D. J., Jones, T. W., Kang, Hyesung
The theory of diffusive particle acceleration explains the spectral properties of the cosmic rays below energies of approx. 10^6 GeV as produced at strong shocks in supernova remnants (SNR's). To...
Particle acceleration at oblique shocks and discontinuities of the density profile (1999)
Gieseler, U. D. J., Kirk, J. G., Gallant, Y. A., Achterberg, A.
In the theory of diffusive acceleration at oblique shock fronts the question of the existence of a discontinuity of energetic particle density is contentious. The resolution of this problem is...
Comment on: Diffusion through a slab (1998)
Gieseler, U. D. J., Kirk, J. G.
Mahan [J. Math. Phys. 36, 6758 (1995)] has calculated the transmission coefficient and angular distribution of particles which enter a thick slab at normal incidence and which diffuse in the slab...
Gieseler, U. D. J., Kirk, J. G.
We present a semi-analytic approach to solving the Boltzmann equation describing the comptonisation of low frequency input photons by a thermal distribution of electrons in the Thomson limit. Our...
Energy correlation and asymmetry of secondary leptons in $H\to t\bar t$ and $H\to W^+W^-$ (1994)
Arens, T., Gieseler, U. D. J., Sehgal, L. M.
We study the energy correlation of charged leptons produced in the decay of a heavy Higgs particle $H\to t\bar t\to bl^+\nu_l\bar bl^-\bar{\nu}_l$ and $H\to W^+W^-\to l^+\nu_ll^-\bar{\nu}_l.$ The...