Giannios Group

- High Energy Astrophysics

Welcome to our webpage

Centaurus A

Centaurus A; credit ESA/NASA

Research Interests

High-energy astrophysics:

  • Theoretical study of the physics of relativistic flows
  • Acceleration, composition of ultra-high-energy cosmic rays
  • The central engine of gamma-ray bursts
  • Accretion and transients in the Galactic center


  • Mergers of compact objects; gravitational wave and electromagnetic signals

Recent Group News

October 2018: Jesus Rueda Becerril just joined our group as a postdoctoral reseacher. Jesus has extensive radiative transfer expertise. Welcome Jesus!

October 2018: Adithan completed a very detailed investigation on the jet structure of the gravitation wave event GW 170817. Dimitrios coauthored this work. 

September 2018: Lingyi's first paper on extreme scattering events has been accepted for publication. Dimitiros and Maria coauthored the work. Congratulations, Ligyi!

September 2018: Dimtirios is awarded a 3-year, NSF Astrophysics Sciences Division Program grant to study the jet structure in short-duration gamma-ray bursts.

June 2018: Dimitrios leads a new study on the profile of dissipation of energy in relatvistic astrophysical jets. 

May 2018: New strong observational evidence of our structured jet model for neutron star mergers are obtained.

May 2018: Ian just graduated our department's PhD program! Dr. Christie will continue his career with a postdoctoral appointment at the Northwestern University.

April 2018: Ian receives 2 prestigious awards for his PhD work: the Charlotte Ida Litman Tubis Award and the George W. Tautfest Award. The first is awarded to the student who promotes clear and concise communication of scientific ideas beyond the physics and astronomy community while the latter honors the most outstanding physics graduate student in high energy particle physics, high energy nuclear physics, or astrophysics. Congratulations Ian!

December 2017: Our structured jet prediction for the prompt and afterglow emission from the first-ever detection of gravitational waves from a merger of 2 neutron stars is nicely supported by observations.

September 2017: Adithan, Rodolfo and Dimitrios propose a promising source a light in connection to gravitation wave detections of binary neutron star mergers. 

September 2017: Maria and Dimitrios are organizing a special session about "Jets in the era of multi-messenger astronomy" to be held in the EWASS 2018 conference.  Abstract submission is open until 27 November 2017. See also Maria's News & Views piece on Nature Astronomy about GRB polarization

August 2017: Our comprehensive study on the stability of relativistic jets appears to the Purdue Research highlights and receives extensive publicity: here, here, and here

June 2017: Maria, Rodolfo and Dimitrios propose a model that can, for the first time, explain the durations and luminosities of gamma-ray bursts.

June 2017: Dimitrios co-authors a detailed exploration on whether millisecond magnetars are the engines of gamma-ray bursts. 

April 2017: The students advance. Ian's work on the radio emission in the Galactic center and Adithan's work on the fallback rate of gas after a stellar tidal disruption have just been published.

March 2017: Great career advancement for the group's postdocs. Maria has been awarded the prestigious Lyman Spitzer, Jr. Postdoctoral Fellowship at Princeton University. Rodolfo has just accepted a tenure-track position at the Department of Physics and Astronomy at California State University Sacramento. Both positions start this Fall.

March 2017: Work from Ian, Maria, and Dimitrios Highlighted by Nature Astronomy.

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