%0 Generic %1 caprioli2019issue %A Caprioli, Damiano %A Haggerty, Colby C. %D 2019 %K better fermi of shocks than theory %T The Issue with Diffusive Shock Acceleration %U http://arxiv.org/abs/1909.06288 %X We discuss the recent developments in the theory of diffusive shock acceleration (DSA) by using both first-principle kinetic plasma simulations and analytical theory based on the solution of the convection/diffusion equation. In particular, we show how simulations reveal that the spectra of accelerated particles are significantly steeper than the $E^-2$ predicted by the standard theory of DSA for strong shocks, in agreement with several observational pieces of evidence. We single out which standard assumptions of test-particle and non-linear DSA are violated in the presence of strong (self-generated) magnetic turbulence and put forward a novel theory in better agreement with the particle spectra inferred with multi-wavelength observations of young SN remnants, radio-supernovae, and Galactic cosmic rays.

@misc{caprioli2019issue, abstract = {We discuss the recent developments in the theory of diffusive shock acceleration (DSA) by using both first-principle kinetic plasma simulations and analytical theory based on the solution of the convection/diffusion equation. In particular, we show how simulations reveal that the spectra of accelerated particles are significantly steeper than the $E^{-2}$ predicted by the standard theory of DSA for strong shocks, in agreement with several observational pieces of evidence. We single out which standard assumptions of test-particle and non-linear DSA are violated in the presence of strong (self-generated) magnetic turbulence and put forward a novel theory in better agreement with the particle spectra inferred with multi-wavelength observations of young SN remnants, radio-supernovae, and Galactic cosmic rays.}, added-at = {2019-09-16T18:40:28.000+0200}, author = {Caprioli, Damiano and Haggerty, Colby C.}, biburl = {https://www.bibsonomy.org/bibtex/2e5f90b1d3abd429eccf41ede566381b6/ericblackman}, description = {The Issue with Diffusive Shock Acceleration}, interhash = {55fce6b2d0621f946fcfac11244254d9}, intrahash = {e5f90b1d3abd429eccf41ede566381b6}, keywords = {better fermi of shocks than theory}, note = {cite arxiv:1909.06288Comment: 8 pages, 2 figures, 36th International Cosmic Ray Conference (ICRC2019), held July 24th-August 1st, 2019 in Madison, WI, U.S.A}, timestamp = {2019-09-16T18:40:28.000+0200}, title = {The Issue with Diffusive Shock Acceleration}, url = {http://arxiv.org/abs/1909.06288}, year = 2019 }