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

25 Mar 2021, 09:00 → 26 Mar 2021, 17:00 Europe/Amsterdam

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 25^th 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.

 

Thursday, 25 March

09:00 → 09:40 Coffee

09:40 → 10:00 Welcome & CAN update

09:40 Welcome and CAN update

Speaker: Sijbrand de Jong

CAN_Seminar_Intro_210325_SdJ.pptx

10:00 → 11:00 Highlight talk

10:00 Clarifying the Hubble Constant Tension

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 → 11:40 Contributed talks

11:00 Status of ETpathfinder

Speaker: Sebastian Steinlechner

Status of ETpathfinder.pdf

11:20 The LISA mission and the NL involvement

Speaker: Gijs Nelemans (Radboud University Nijmegen)

APP_Nelemans_LISA.pdf

11:40 → 12:00 Minitalks

11:40 Minitalks round 1

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

12:00 → 13:00 Lunch and Poster session

13:00 → 13:30 Update talks

13:00 The Cherenkov Telescope Array: a new eye on the TeV sky

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

20210326_CTA_NL_RZanin_v1.pdf

13:30 → 14:00 Minitalks

13:30 Minitalks round 2

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

14:00 → 14:20 Contributed talks

14:00 The Dutch involvement in the H.E.S.S. and CTA gamma-ray observatories

Speaker: Dr Jacco Vink (University of Amsterdam)

vink_app_symposium_25_03_2021.pdf

14:20 → 14:50 Update talks

14:20 Detection of ultra-high-energy particles with the Pierre Auger Observatory and GRAND

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

APP_CR_talk_March_2021.pdf

14:50 → 15:10 Contributed talks

14:50 A new window to Axion-Like Particles from the upcoming CMB experiments

Speaker: Suvodip Mukherjee (GRAPPA, University of Amsterdam)

Symposium_Amsterdam_2021_Mukherjee.pdf

15:10 → 15:40 Minitalks

15:10 Minitalks round 3

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

15:40 → 16:40 Parralel session

Open-ended discussion session in parallel rooms

15:40 Breakout room 1 - Gravitational waves

Chair: Chris van den Broek

15:40 Breakout room 2 - Gamma rays

Speaker: Manuela Vecchi (University of Groningen)

15:40 Breakout room 3 - Cosmic rays

Speaker: Charles Timmermans

15:40 Breakout room 4 - Neutrinos

Speaker: Thijs Juan van Eeden

15:40 Breakout room 5 - Dark matter

Speaker: Patrick Decowski

Friday, 26 March

09:00 → 09:30 Coffee

09:30 → 09:50 Contributed talks

09:30 First results from the AugerPrime Radio Detector

Speaker: Tomáš Fodran (Radboud University)

25thAPP-Tomas-Fodran.pdf

09:50 → 10:20 Update talks

09:50 Investigating the universe with gravitational waves: recent results and future prospects

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)

GravitationalWaves-APP.pdf

10:20 → 11:20 Contributed talks

10:20 Multimessenger constraints on the neutron-star equation of state and the Hubble constant

Speaker: Mr Peter T. H. Pang (Utrecht University)

20210326_APP.pdf

10:40 A high-energy neutrino coincident with a tidal disruption event

Speaker: Sjoert van Velzen (Leiden Observatory)

Neutrino15min_vanVelzen.pdf

11:00 First neutrinos with KM3NeT/ORCA

Speaker: Valentin Pestel

25SympAstroParticlesNetherlands- ORCA data.pdf

11:20 → 12:00 Minitalks

11:20 Minitalks round 4

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

12:00 → 13:30 Lunch and Poster session

13:30 → 13:50 Contributed talks

13:30 Dark Matter Searches with the KM3NeT Neutrino Telescope

Speaker: Suzan Basegmez du Pree

Suzan_APPNL_March_2021.pdf

13:50 → 14:30 Minitalks

13:50 Minitalks round 5

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

14:30 → 15:30 Update talks

14:30 Cosmic neutrinos: from meV to PeV

Speaker: Shin'ichiro Ando (University of Amsterdam)

Ando_CAN2021.pdf

15:00 Direct searches for Dark Matter

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

CANSymposium2021.pdf

15:30 → 16:00 Coffee