25th Symposium on Astroparticle Physics in the Netherlands, 25/26 March 2021, ZOOM

Andreas Freise, Christoph Weniger (University of Amsterdam)

The annual meeting of the Dutch astroparticle physics community will be held this year as a two-day symposium on 25 and 26 March 2021 via ZOOM and gather.town. This will be the 25th symposium of a series which started in the year 2004. The meetings are organized by the Committee of Astroparticle Physics in the Netherlands - CAN. The edition of the symposium will take a slightly different form from previously: there will be one key-note address, updates of the five pillar programmmes of the Dutch astroparticle physics strategy, a few contributed talks and an open floor for all participants to introduce themselves and their ideas in short flash talks. 
Contributions can be indicated on the registration.

This meeting is supported by Nikhef and NOVA and this year free of charge.

More info, details and a draft programme will follow soon.


  • Abha Khakurdikar
  • Adam Coogan
  • Alessandra Menicucci
  • Alexandra Mitchell
  • Alexandra Wernersson
  • Amit Reza
  • Ana Achucarro
  • Andreas Freise
  • Andrei Utina
  • Anna Puecher
  • Anne Timmermans
  • Antonella Bianchi
  • Ariane Dekker
  • Ariane Guiot
  • Ayatri Singha
  • Barbara Paetsch
  • Bas Swinkels
  • Bob Truijen
  • Bob van Eijk
  • Bouke Jisse Jung
  • Brían Ó Fearraigh
  • Béatrice Bonga
  • Camila Correa
  • Charles Timmermans
  • Chinmay Kalaghatgi
  • Chris Van Den Broeck
  • Chris van den Oetelaar
  • Christoph Weniger
  • Cristina Galea
  • Dimitrios Kantzas
  • Dion Noordhuis
  • Dmitry Prokhorov
  • Dorothea Samtleben
  • Eduardo Ferronato Bueno
  • Ernst-Jan Buis
  • Fabian Zimmer
  • Gastón Creci
  • Gideon Koekoek
  • Gijs Nelemans
  • Guoxi Zhu
  • Haris Maliyamveettil
  • Henk Bulten
  • Inge van Rens
  • Jacco Vink
  • Jan Willem v. Holten
  • Jan-Simon Hennig
  • Jann Aschersleben
  • Jesse van Dongen
  • Jikke Tacken
  • Job de Kleuver
  • Joerg Hoerandel
  • Joran Angevaare
  • Jordan Seneca
  • Jordi Folch Eguren
  • Justin Janquart
  • Kamile Lukosiute
  • Katrien Uytterhoeven
  • Khung Sang Phukon
  • Leon Sosapanta
  • Lodewijk Nauta
  • Luciano Gottardi
  • Manuela Vecchi
  • Maricke Flierman
  • Mart Pothast
  • Matthieu Schaller
  • Mieke Bouwhuis
  • Mischa Sallé
  • Mohit Saharan
  • Noemi Anau Montel
  • Olaf Scholten
  • Oscar Macias
  • Otto Hannuksela
  • Panos Christakoglou
  • Patrick Decowski
  • Paul de Jong
  • Pawan Gupta
  • Peter Gaemers
  • Peter T. H. Pang
  • Rafael Alves Batista
  • Rasa Muller
  • Ronald Bruijn
  • Samuel Witte
  • Saskia Matheussen
  • Sebastian Steinlechner
  • Sera Markoff
  • Serena Di Pede
  • Shin'ichiro Ando
  • Sijbrand de Jong
  • Sofia Canevarolo
  • Soumen Roy
  • Stefan Bruenner
  • Stefan Danilishin
  • Stefan Hild
  • Steven Bloemen
  • Suvodip Mukherjee
  • Suzan Basegmez du Pree
  • Thijs van Eeden
  • Tina Pollmann
  • Tomislav Prokopec
  • Ugo Giaccari
  • Valentin Pestel
  • Viola Spagnuolo
  • Wanga Mulaudzi
  • Washington Carvalho Jr
  • Yoshinta Setyawati
  • Youri Sloots
  • Zheng Cao
  • Thursday, March 25
    • 9:00 AM 9:40 AM
      Coffee 40m
    • 9:40 AM 10:00 AM
      Welcome & CAN update
    • 10:00 AM 11:00 AM
      Highlight talk
      • 10:00 AM
        Clarifying the Hubble Constant Tension 1h

        Abstract: Our best estimate of the Universe's current expansion rate (the Hubble constant) from the local Universe (via the Cepheid distance ladder) is in four-sigma tension with the value extrapolated from cosmic microwave background data assuming the standard cosmology. Whether this discrepancy represents physics beyond the Standard Model or deficiencies in our understanding of the data is the subject of intense debate. In this talk, I will review the community's attempts to explain and interpret the Hubble constant tension, clarifying the current picture using Bayesian probability theory, and consider the potential for independent gravitational wave observations to arbitrate the dispute.

        Speaker: Dr Stephen Feeney (University College London)
    • 11:00 AM 11:40 AM
      Contributed talks
    • 11:40 AM 12:00 PM
      • 11:40 AM
        Minitalks round 1 20m

        Dmitry Prokhorov
        Oscar Macias
        Alexandra Wernersson
        Samuel Witte
        Joran Angevaare
        Béatrice Bonga
        Andrei Utina

    • 12:00 PM 1:00 PM
      Lunch and Poster session
    • 1:00 PM 1:30 PM
      Update talks
      • 1:00 PM
        The Cherenkov Telescope Array: a new eye on the TeV sky 30m

        Very-high-energy (VHE) gamma-ray astroparticle physics is a relatively young field, and observations over the past decade have surprisingly revealed almost two hundred VHE emitters which appear to act as cosmic particle accelerators. These sources are an important component of the Universe, influencing the evolution of stars and galaxies. At the same time, they also act as a probe of physics in the most extreme environments known - such as in supernova explosions, and around or after the merging of black holes and neutron stars. However, the existing experiments have provided exciting glimpses, but often falling short of supplying the full answer. A deeper understanding of the TeV sky requires a significant improvement in sensitivity at TeV energies, a wider energy coverage from tens of GeV to hundreds of TeV and a much better angular and energy resolution with respect to the currently running facilities. The next generation gamma-ray observatory, the Cherenkov Telescope Array (CTA), is the answer to this need. In this talk I will present this upcoming observatory from its design to the construction, and its potential science exploitation. CTA will allow the entire astronomical community to explore a new discovery space that will likely lead to paradigm-changing breakthroughs. In particular, CTA has an unprecedented sensitivity to short (sub-minute) timescale phenomena, placing it as a key instrument in the future of multi-messenger and multi-wavelength time domain astronomy.

        Speaker: Dr Roberta Zanin
    • 1:30 PM 2:00 PM
      • 1:30 PM
        Minitalks round 2 30m

        Patrick Decowski
        Serena Di Pede
        Cristina Galea
        Bouke Jisse Jung
        Lodewijk Nauta
        Barbara Paetsch
        Mischa Sallé
        Charles Timmermans
        Suzan Basegmez du Pree
        Chris van den Oetelaar

    • 2:00 PM 2:20 PM
      Contributed talks
      • 2:00 PM
        The Dutch involvement in the H.E.S.S. and CTA gamma-ray observatories 20m
        Speaker: Dr Jacco Vink (University of Amsterdam)
    • 2:20 PM 2:50 PM
      Update talks
      • 2:20 PM
        Detection of ultra-high-energy particles with the Pierre Auger Observatory and GRAND 30m

        Ultra-high-energy cosmic rays are unique probes of both cosmic phenomena and particle interactions at energies well beyond what is achievable with human-made accelerators. In the past decade, much progress has been made in their detection and study, notably also with the Pierre Auger Observatory. Definitive answers on questions such as their cosmic sources and precise models for hadronic physics at the sqrt(s)=100 TeV scale require knowledge of the ultra-high-energy cosmic ray composition. The detection of ultra-high-energy neutrinos and photons will provide important complementary information to that of cosmic rays. The AugerPrime upgrades aim at improving composition information and neutrino and photon identification. It is already clear that for detailed ultra-high-energy cosmic ray, neutrino and photon astronomy a next generation observatory will be needed, for which the Giant Radio Array for Neutrino Detection (GRAND) has the most advanced design. The Dutch cosmic ray science group plays leading roles in both the AugerPrime upgrade and the preparations for GRAND. The status of the field based on the Pierre Auger Observatory data, as well as the progress on the AugerPrime upgrade and GRAND prototypes will be presented.

        Speaker: Cristina Galea
    • 2:50 PM 3:10 PM
      Contributed talks
    • 3:10 PM 3:40 PM
      • 3:10 PM
        Minitalks round 3 30m

        Adam Coogan
        Stefan Danilishin
        Ariane Dekker
        Eduardo Ferronato Bueno
        Andreas Freise
        Ugo Giaccari
        Otto Hannuksela
        Jan-Simon Hennig
        Stefan Hild
        Jesse van Dongen

    • 3:40 PM 4:40 PM
      Parralel session

      Open-ended discussion session in parallel rooms

      • 3:40 PM
        Breakout room 1 - Gravitational waves 1h

        Chair: Chris van den Broek

      • 3:40 PM
        Breakout room 2 - Gamma rays 1h
        Speaker: Manuela Vecchi (University of Groningen)
      • 3:40 PM
        Breakout room 3 - Cosmic rays 1h
        Speaker: Charles Timmermans
      • 3:40 PM
        Breakout room 4 - Neutrinos 1h
        Speaker: Thijs Juan van Eeden
      • 3:40 PM
        Breakout room 5 - Dark matter 1h
        Speaker: Patrick Decowski
    • 9:00 AM 9:30 AM
      Coffee 30m
    • 9:30 AM 9:50 AM
      Contributed talks
      • 9:30 AM
        First results from the AugerPrime Radio Detector 20m
        Speaker: Tomáš Fodran (Radboud University)
    • 9:50 AM 10:20 AM
      Update talks
      • 9:50 AM
        Investigating the universe with gravitational waves: recent results and future prospects 30m

        In the past few years, gravitational waves have proved an incredible tool to investigate the Universe. The third LIGO-Virgo observation run was concluded last Spring and results from its first half, O3a, are now available. I will give an overview of these new events and their implications, focusing on the so-called "special events", whose unexpected features require us to question our current understanding of the astrophysics of compact objects. I will then outline the future prospects in gravitational waves, in particular for what concerns the Dutch efforts in this field.

        Speaker: Anna Puecher (Nikhef)
    • 10:20 AM 11:20 AM
      Contributed talks
      • 10:20 AM
        Multimessenger constraints on the neutron-star equation of state and the Hubble constant 20m
        Speaker: Mr Peter T. H. Pang (Utrecht University)
      • 10:40 AM
        A high-energy neutrino coincident with a tidal disruption event 20m
        Speaker: Sjoert van Velzen (Leiden Observatory)
      • 11:00 AM
        First neutrinos with KM3NeT/ORCA 20m
        Speaker: Valentin Pestel
    • 11:20 AM 12:00 PM
      • 11:20 AM
        Minitalks round 4 30m

        Gastón Creci
        Jann Aschersleben
        Maricke Flierman
        Dimitrios Kantzas
        Rasa Muller
        Khung Sang Phukon
        Tomislav Prokopec
        Soumen Roy
        Viola Spagnuolo
        Christoph Weniger

    • 12:00 PM 1:30 PM
      Lunch and Poster session
    • 1:30 PM 1:50 PM
      Contributed talks
      • 1:30 PM
        Dark Matter Searches with the KM3NeT Neutrino Telescope 20m
        Speaker: Suzan Basegmez du Pree
    • 1:50 PM 2:30 PM
      • 1:50 PM
        Minitalks round 5 40m

        Joerg Hoerandel
        Sijbrand de Jong
        Manuela Vecchi
        Abha Khakurdikar
        Gideon Koekoek
        Sera Markoff
        Gijs Nelemans
        Dion Noordhuis
        Brían Ó Fearraigh
        Peter T. H. Pang
        Mart Pothast
        Matthieu Schaller
        Ayatri Singha
        Sebastian Steinlechner

    • 2:30 PM 3:30 PM
      Update talks
      • 2:30 PM
        Cosmic neutrinos: from meV to PeV 30m
        Speaker: Shin'ichiro Ando (University of Amsterdam)
      • 3:00 PM
        Direct searches for Dark Matter 30m

        Direct searches for Dark Matter in the form of WIMP-like particles continue to push toward the neutrino floor. Researchers in the Netherlands play a leading role in the XENON class of detectors. The XENON1T experiment has finished its data-taking phase, reaching an unprecedented sensitivity of $4\cdot10^-{47}$ cm$^2$ spin-independent WIMP-nucleon scattering cross section at 25~GeV WIMP mass. The next generation XENONnT detector, which is expected to increase sensitivity by more than an order of magnitude, is being commissioned now, while the DARWIN detector, which will be sensitive down to the neutrino floor, is in the planning stage. This presentation reviews the status of the field of direct searches world-wide, with a focus on the experiments with significant Dutch contributions.

        Speaker: Tina Pollmann
    • 3:30 PM 4:00 PM
      Coffee 30m