Carl-Johan Haster

Gravitational Wave Astrophysicist


Nevada Center for Astrophysics

Department of Physics & Astronomy

University of Nevada, Las Vegas

4505 S. Maryland Pkwy, Box 454002

Las Vegas, NV 89154-4002

I am an Assistant Professor of Astrophysics in the Department of Physics & Astronomy and the Nevada Center for Astrophysics at University of Nevada, Las Vegas. Before this, I was a Postdoctoral Associate at the LIGO Laboratory and the Kavli Institute for Astrophysics and Space Research at MIT, a CITA Postdoctoral Fellow at Canadian Institute for Theoretical Astrophysics a PhD student at University of Birmingham and a MPhys student at University of Manchester.

My main research interests are all the exciting things we can learn about the extremes of our Universe through observations of Gravitational Waves (for example using the current LIGO, or future Cosmic Explorer, instruments). I am particularly interested in finding satisfactory robust connections between the observed population of compact objects, mainly black holes and neutron stars, and the astrophysical processes through which these objects are formed and evolve. I am also interested in exploring matter at its extremes, like what can be found in coalescing neutron star binaries, how this can be observed using as many astrophysical messengers as possible and help us find the best model for the Neutron Star Equation of State. Finally, I enjoy working on the inference methods used to analyse these gravitational wave signals, in order to improve their speed, fidelity and robustness. This will in turn be crucial for using these observations for precision tests of General Relativity as our preferred theory of gravitation, as otherwise it’s easy to confuse a claimed beyondGR detection caused by a not-accurate-enough analysis.


Sep 13, 2022 The NCfA (Nevada Center for Astrophysics) is now officially approved by the NSHE Board of Regents.
Aug 22, 2022 Today is my first day at UNLV!

selected publications

  1. GWTC-2.1: Deep Extended Catalog of Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
    Abbott, R.,  ..., Carl-Johan Haster,  ..., and  (LIGO Scientific Collaboration, Virgo Collaboration)
    ArXiv e-prints Aug 2021
  2. Inference of the Neutron Star Equation of State from Cosmological Distances
    Carl-Johan HasterKaterina Chatziioannou, Andreas Bauswein, and James Alexander Clark
    Phys. Rev. Lett. Dec 2020
  3. Pi from the sky – A null test of general relativity from a population of gravitational wave observations
    Carl-Johan Haster
    ArXiv e-prints May 2020