Conveners
Modeling: particle acceleration and propagation
- Andrii Neronov (University of Geneva)
Modeling: particle acceleration and propagation
- Pasquale Blasi (Osservatorio Astrofisico di Arcetri)
Prof.
Pasquale Blasi
(Osservatorio Astrofisico di Arcetri)
21/01/2015, 14:30
Gwenael Giacinti
(University of Oxford, Clarendon Laboratory)
21/01/2015, 15:30
Analyses of TeV-PeV cosmic ray (CR) diffusion around their sources usually assume either isotropic diffusion, or anisotropic diffusion due to the regular Galactic magnetic field in the spiral arms of our Galaxy. We show that none of these descriptions is adequate on distances smaller than a few coherence lengths (~ 10 pc) of the turbulent interstellar magnetic field.
As a result, we predict...
Dr
Stefano Gabici
(Laboratoire APC - AstroParticule et Cosmologie)
22/01/2015, 14:00
Dr
Andrew Taylor
(Dublin Institute for Advanced Studies)
22/01/2015, 14:40
Using different Monte Carlo codes such as Geant 4.10, Pythia 8.18, SIBYLL and QGSJET, as well as compiling published data on $pp$ interactions close to the kinematic threshold, we parametrize the energy spectra and production rates of gamma-rays by simple but quite accurate ($\leq 20 \%$) analytical expressions in a broad range from the kinematic threshold to PeV energies.
Carmelo Evoli
(Hamburg University)
22/01/2015, 15:20
At GeV-TeV energies the propagation of CRs is diffusive. Current models of galactic propagation are based on a simplified approach for which diffusion is constant and isotropic.
In fact, diffusion transport must be described as in-homogenous and anisotropic and experimental data have now reached an accuracy that allows to study such effects.
In my talk, I will present some of the...
Timur Delahaye
(Oskar Klein Centre)
22/01/2015, 15:40
Recent results from the AMS-02 data have confirmed that the cosmic ray positron fraction increases with energy between 10 and 200GeV. This quantity should not exceed 50%, and it is hence expected that it will either converge towards 50% or fall. We study the possibility that future data may show the positron fraction dropping down abruptly to the level expected with only secondary production,...
Martina Cardillo
(INAF - Osservatorio astrofisico di Arcetri)
22/01/2015, 16:00
One of the main open issues about the origin of Galactic CRs is the maximum energy that can be achieved by acceleration in Supernova Remnants.
In a rigidity dependent acceleration mechanism, protons are expected to reach a few PeV and heavier ions correspondingly higher energies.
A recent theory suggests that, in a core-collapse SNR expanding in its pre-supernova wind, magnetic field...
