Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Gieseler, U. D. J."'
Publikováno v:
Astrophys.J. 579 (2002) 337-358
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 is followed numerically by filtering the diffusive
Externí odkaz:
http://arxiv.org/abs/astro-ph/0207410
Publikováno v:
Astron. Astrophys. 364, 911-922 (2000)
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 based on the interactions of the suprathermal particl
Externí odkaz:
http://arxiv.org/abs/astro-ph/0011058
Autor:
Gieseler, U. D. J., Jones, T. W.
Publikováno v:
Astron. Astrophys. 357, 1133-1136 (2000)
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 results are compared to analytical treatments, for
Externí odkaz:
http://arxiv.org/abs/astro-ph/0003082
Autor:
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 repeated shock crossings, the transport in the direction
Externí odkaz:
http://arxiv.org/abs/astro-ph/9906112
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 supply the observed flux of cosmic rays, a significant
Externí odkaz:
http://arxiv.org/abs/astro-ph/9906114
Publikováno v:
Astron.Astrophys.345:298-306,1999
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 interesting from a theoretical point of view, and potenti
Externí odkaz:
http://arxiv.org/abs/astro-ph/9902079
Autor:
Gieseler, U. D. J., Kirk, J. G.
Publikováno v:
J. Math. Phys. 38, 2751 (1997)
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 with linear anisotropic, non-absorbing, scattering. Us
Externí odkaz:
http://arxiv.org/abs/physics/9803033
Autor:
Gieseler, U. D. J., Kirk, J. G.
Publikováno v:
Astron. Astrophys. 323 (1997) 259-270
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 work is based on the formulation of the problem by Tit
Externí odkaz:
http://arxiv.org/abs/astro-ph/9612175
Publikováno v:
Phys.Lett.B339:127-135,1994
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 possible influence of $CP$--violation in the $Ht\bar t
Externí odkaz:
http://arxiv.org/abs/hep-ph/9408316