Astroplasmas Seminar

Fridays at 12:30pm, Dome Room, Peyton Hall

Next seminar

Friday, April 16th, 12:30pm

Phenomenology and theory of galactic cosmic-ray propagation

Prof. Carmelo Evoli (GSSI L'Aquila)

Abstract: Cosmic rays are the most energetic particles in the local Universe as they are known to reach energies above few Joules. How and where they are produced have been a science puzzle for several decades now, whose solution has been driving the rising of multi-messenger astrophysics as well as novel theoretical approaches. Of particular interest is the energy range below ~PeV as we expect that these particles have been all accelerated in the most extreme objects in our own Galaxy. Additionally, the past decade has seen an unprecedented improvement in the quality and quantity of data about their energy spectrum and chemical composition, allowing us to infer global properties as the galactic grammage and the average residence time. These quantities are crucial to test any more fundamental description of the transport of charged particles in the interstellar plasma. Even more thrilling, these new measurements, together with a deeper scrutiny of the diffuse gamma-ray emission from the Galactic plane, have revealed unexpected new features in the cosmic-ray elemental spectra that are challenging the commonly accepted scenario of how these particles are energized and propagate through interstellar space.

In my talk I will provide an overview of these recent findings, and discuss some of the new ideas proposed to explain these anomalies.


Scheduled seminars (Jan--Jun 2021)

22 Jan: "Violation of the zeroth law of turbulence in space plasmas" (Dr. Romain Meyrand, University of Otago)

29 Jan:

5 Feb:

12 Feb:

19 Feb: "Primordial vs astrophysical models for the emergence of cosmic magnetism: an observational and theoretical challenge" (Prof. Franco Vazza, University of Bologna)

26 Feb: [SPECIAL TIME: 12:00pm] "Non ideal effects in protoplanetary disks: transition from turbulent to Dead Zone in local and global stratified simulations" (Dr. Fulvia Pucci, JPL)

5 Mar:

12 Mar:

19 Mar: [SPECIAL TIME: 11:30am] "MHD turbulence: simulation, observation, impact on particle transport" (Prof. Huirong Yan, DESY & Potsdam University)

26 Mar: "Extreme particle acceleration in pulsars: from the magnetosphere to the nebula" (Dr. Benoit Cerutti, CNRS Grenoble)

2 Apr:

9 Apr:

16 Apr: "Phenomenology and theory of galactic cosmic-ray propagation" (Prof. Carmelo Evoli, GSSI L'Aquila)

23 Apr: "The dynamics of pair and electron-ion relativistic collisionless shock waves" (Dr. Arno Vanthieghem, Stanford)

30 Apr: [SPECIAL TIME: 12:00pm] TBA. (Dr. Geoffroy Lesur, CNRS Grenoble)

7 May:

14 May: TBA. (Prof. Anna Tenerani, UT Austin)

21 May:

28 May:

4 Jun: [TBC] TBA. (Prof. Helen Russell, University of Nottingham)

11 Jun:

18 Jun:

25 Jun: