Fabian Kislat

Research Assistant Professor

Office Contact Information

271 Compton

Physics Department, CB 1105
Washington University
One Brookings Drive
St. Louis, MO 63130-4899, USA

(314) 935-6734
(314) 935-6219

Research Interests

Dr. Kislat works in the field of experimental astroparticle physics. His main interest is the development of detectors for x-ray and gamma-ray polarimetry. Dr. Kislat continues to make major contributions to the development of the balloon-borne x-ray polarimeter X-Calibur. The instrument is scheduled for launch in Fall 2016 for a one-day flight from Ft. Sumner, New Mexico, and in the 2018/19 Antarctic summer season for a long-duration flight from McMurdo, Antarctica. X-ray polarimetry promises to provide geometrical information about objects that are too small to be spatially resolved.

Dr. Kislat uses astrophysical observations to test fundamental laws of physics, such as Lorentz and CPT invariance. Signatures of Lorentz violation include an energy and polarization dependence of the speed of light in vacuum. The energy dependence can be constrained by measurements of the arrival time of high-energy photons in instruments such as the Fermi Large Area Telescope, and polarization measurements, not only of x-rays, but also in the optical band can be used to constrain vacuum birefringence. Vacuum birefringence may also occur in very strong magnetic fields, an effect that is predicted by QED. Broadband x-ray polarization measurements of accretion-powered pulsars provide a very clear signature of this effect due to an interplay of plasma and vacuum effects in the emission region. X-Calibur or a follow-up space-based mission would be ideally suited to provide the first test of this prediction of QED.

Selected Recent Publications

  • Search for anisotropic Lorentz invariance violation with γ-rays, Kislat, F. and Krawczynski, H., 2015, Accepted for publication in Phys. Rev. D
  • Analyzing the Data from X-ray Polarimeters with Stokes Parameters, Kislat, F., Clark, B., Beilicke, M., Krawczynski, H., 2015, Astroparticle Physics, Volume 68, p. 45-51.
  • An unfolding method for X-ray spectro-polarimetry, Kislat, F., Beilicke, M., Guo, Q., Zajczyk, A., Krawczynski, H. 2015, Astroparticle Physics, 64, 40.
  • Design and Performance of the X-ray Polarimeter X-Calibur, Beilicke, M., Kislat, F., Zajczyk, A., Guo, Q., Endsley, R., Stork, M., Cowsik, R., Dowkontt, P., Barthelmy, S., Hams, T., Okajima, T., Sasaki, M., Zeiger, B., de Geronimo, G., Baring, M. G., Krawczynski, H. 2014, Journal of Astronomical Instrumentation, 3, 2.
  • All-particle cosmic ray energy spectrum measured with 26 IceTop stations, Abbasi, R. et al. (IceCube Collaboration), 2013, Astropart. Phys. 44, 40.
  • IceTop: The Surface Component of IceCube, Abbasi, R. et al. (IceCube Collaboration), 2013, NIM A700, 188.

Fabian Kislat's Complete CV


2011 Ph.D., Humboldt University, Berlin, Physics
2008 M.Sc., Humboldt University, Berlin, Physics

Professional History

2015-present Research Assistant Professor at Washington University
2012-2015 Research Associate at Washington University
2011-2012 Research Associate at Deutsches Elektronen-Synchrotron (DESY), Zeuthen, Germany