Stockholm university

Jan Conrad

About me

Professor in Astroparticle Physics, Head of Department



My group  and I work mainly on astrophysical searches for particle dark matter, with gamma-ray telescopes on satellites (like the Fermi Large Area Telescope) and on ground (like H.E.S.S.) or in deep underground experiments (XENON). More details and links can be found on the group page - see to the right.

Statistical issues pertinent to dark matter searches are particularly close to my heart, which is why I like to collaborate with statististicans. From 2015-2018 I was a guest professor in the mathematics department since 2015. 

I have been  working with the AMANDA/IceCube neutrino telescope (1999-2003),  at CERN with the ALICE detector (2004-2005) and for a shorter period with the PAMELA (2006/07) cosmic-ray experiment.

My group, called DMAP, consists currently of one senior scientist: Jörn Mahlstedt (XENON, DARWIN lead), three post-docs: Timon Emken (LDMX/Theory), Ashley Joy (XENON), Andrea Gallo-Rosso (ALPHA) and two PhD students Cristian Antochi, Pueh Leng Tan (both XENON). 

Previous members of the group (in temporal order):Jelle Aalbers (now KIPAC fellow at Stanford),  Bart Pelssers (XENON, now industry),  Knut Morå (now at Columbia University), Matthew Lawson (now in Frank Wilczek's group at Fysikum), Andrea Chiappo (now industry), Boris Bauermeister (now industry),  Derek Barge (Wennergren-Fellow, now industry), Ben Farmer (now industry) Manuel Meyer (now ERC starting grant recipient at Erlangen), Miguel Sanchez Conde (now permanent University Autonoma of Madrid), Brandon Anderson (now at Head of Data Science at Stanford RegLab), Greg Martinez (now at UCLA), Hugh Dickinson (now at Open University, UK), Gerrit Spengler (now industry), Joachim Ripken (now at MPI for Solar Physics), Stephan Zimmer (now industry), Maja Llena-Garde (now at Uppsala University), Alexander Sellerholm (now industry), Tomi Ylinen (now industry).

Recent pubications of my group (selected, i.e. at least with direct and significant contribution):

  1. S. Abdus-Salam et al.
    Simple and statistically sound strategies for analysing physical theories
  2. S. Algeri, J. Aalbers, K. D. Morå, J. Conrad
    Searching for new phenomena with profile likelihood ratio tests
    Nature Rev.Phys.
     2 (2020) 5, 245-252
  3. J. Aalbers, B. Pelssers, V.C. Antochii, P.L. Tan, J. Conrad
    Finding dark matter faster with explicit profile likelihoods
     102 (2020) 7, 072010
  4. E. Aprile et al [XENON]
    Light Dark Matter Search with Ionization Signals in XENON1T
    Phys.Rev.Lett. 123 (2019) 25, 251801
  5. G. Centers, J. Blanchard, J. Conrad, A. Garcon, A. V. Gramolin , D. F. Kimball, M. Lawson , B. Pelssers, J. A. Smiga, Y. Stadnik, A. Shushkov A. Wickenbrock, D. Budker, and A. Derevianko
    Stochastic amplitude fluctuations of bosonic dark matter and revised constraints on linear couplings
  6. E. Aprile et al [XENON]
    XENON1T Dark Matter Data Analysis: Signal \& Background Models, and Statistical Inference, Phys.Rev.D 99 (2019) 11, 112009
  7. E. Aprile et al [XENON]                                                                       
    First results on the scalar WIMP-pion coupling, using the XENON1T experiment                                                                                    
  8. U. Simola, B. Pelssers, D. Barge, J. Conrad, J. Corander
    Machine Learning Accelerated Likelihood-Free Event Reconstruction in Dark Matter Direct Detection
  9. A. Chiappo, J. Cohen-Tanugi, J. Conrad, L. E. Strigari
    Dwarf spheroidal J-factors without priors: approximate likelihoods for generalised NFW profiles
  10. M.G. Betti et al [PTOMELY] 
    A Design for an Electromagnetic Filter for Precision Energy Measurements at the Tritium Endpoint
  11. K. Dundas Morå                                                                                      Harmonizing discovery thresholds and reporting two-sided confidence intervals: a modified Feldman & Cousins method
  12. D. Ferenc, .. A. Ferella et al                                                                        ABALONE Photosensors for the IceCube Experiment
  13. M. Geilhufe, B. Oolsthorn, A. Ferella, T. Koski, F. Kahlhoefer, J. Conrad, A. Balatsky
    Materials Informatics for Dark Matter Detection
    Physica Status Solidi RRL 2018, 1800293 
  14. E. Aprile et al [XENON]
    Dark Matter Search Results from a One Ton-Year Exposure of XENON1T 
    Phys.Rev.Lett. 121 (2018) no.11, 111302 
  15. R. Catena, J. Conrad, M. B. Krauss
    Compatibility of a dark matter discovery at XENONnT or LZ with the WIMP thermal production mechanism 
    Phys.Rev. D97 (2018) no.10, 103002

Research projects