News from the Dark 8

11 sept. 2023, 10:00 → 13 sept. 2023, 17:00 Europe/Paris

Salle Solvay (NO, level 5) (Université Libre de Bruxelles)

Benoit Famaey (CNRS Observatoire astronomique de Strasbourg), Julien Lavalle (LUPM - Montpellier), Laura Lopez-Honorez (Université Libre de Bruxelles), Sebastien Clesse (Université Libre de Bruxelles (ULB), Brussels)

This mini-workshop is aimed at gathering a few experts from different fields (mostly theoretical cosmology, galactic dynamics, [astro]particle physics) to discuss current progress, issues, and prospects in the understanding of dark matter (DM). The focus is mostly on how different DM scenarios imprint galactic and subgalactic scales, and how these can in turn be used to discriminate among several classes of DM candidates. This is directly linked to the small-scale tensions the LCDM paradigm is currently facing, which could be related either to baryonic physics, specific dark matter properties, or both.

Participation is on invitation, and the philosophy may be summarized as: interactive, friendly, unveil the dust under carpets, share knowledge or ideas,  trigger collaborative work. This is the eigth edition of this workshop series (previous editions: 2013, 2017, 2018, 2019, 2020, 2021, 2022).

The 2023 meeting will take place at Université Libre de Bruxelles (Brussels).

This meeting is partly supported by ULB, the Francqui Foundation, LUPM, ObAS, the CNRS-INSU National Programs PNHE and PNCG, the ANR under contract ANR-18-CE31-0006 (the GaDaMa project), and by the ERC project GREATDIGINTHESKY.

 

 

lundi 11 septembre

14:00 → 14:10 Welcome

NFTD2023-Welcome.pdf

14:10 → 15:40 Dark Matter Models

Président de session: Laura Lopez Honorez (Universidad Autonoma de Madrid)

14:10 Matter-antimatter asymmetry and dark matter stability from baryon number conservation

Orateur: Alejandro Ibarra (TUM)

01_Ibarra.pdf

14:40 Primordial black holes as dark matter candidates

Orateur: Florian Kuhnel (MPP and LMU)

02_Kuhnel.pdf

15:10 Recent Developments in Relativistic Embeddings of MOND

Orateur: Amel Durakovic (ObAS & CEICO, FZU)

03_Durakovic.pdf

15:40 → 16:10 Coffee Break

16:10 → 17:40 Dark Matter Models

Président de session: Laura Lopez Honorez (Universidad Autonoma de Madrid)

16:10 The rapid production mechanism of dark matter

Orateur: Disha Bhatia (Institute of Physics, University of Sao Paulo)

04_Bhatia.pdf

16:40 A Theory of Condensed Dark Matter

Orateur: Jérôme Vandecasteele (TUM)

05_Vandecasteele.pdf

17:10 Dark matter from the center of SU(N)

Orateur: Nicolas Grimbaum-Yamamoto (ULB)

06_Grimbaum-Yamamoto.pdf

17:40 → 18:10 Discussion

18:10 → 19:10 Welcome drink

mardi 12 septembre

09:30 → 11:00 Structure formation & Cosmology

Président de session: Sebastien Clesse (Université Libre de Bruxelles (ULB), Brussels)

09:30 Why we need to care about unobservable modes

In the coming decades, large observational efforts will allow us to map the distribution of the large scale structure of the Universe, the cosmic web. The main purpose of these galaxy surveys is to extract the information present in the observed density fluctuations, to deepen our understanding of gravity and the dark sector. However, from observations of the Cosmic Microwave Background, we know that there are also fluctuations on ultra-large scales, scales larger than these future surveys. In this talk, I will discuss the impact of these modes. They effectively renormalise the mean matter density and are essentially unobservables; however they increase cosmic variance by their coupling to observed modes. This increase of uncertainties is called super-sample covariance and has been the subject of intense research since the 2010s. While not giving a comprehensive review of the field, I will present some of my contributions to it and showcase the expected impact for the coming European survey Euclid.

Orateur: Dr Fabien Lacasa (UniGe)

01_Lacasa.pdf

10:00 Cosmological probes of particle dark matter

Orateur: Deanna Hooper (Helsinki University)

NftD23_Hooper.pdf

10:30 The invisible dilaton

Orateur: Philippe Brax (IPHT)

The invisible dilaton.pdf

11:00 → 11:30 Coffee Break

11:30 → 12:30 Structure formation & Cosmology

Président de session: Sebastien Clesse (Université Libre de Bruxelles (ULB), Brussels)

11:30 Axion dark mutterings

Orateur: Javier Redondo (Theoretical Physics D., Zaragoza University. Max Planck Institute for Physics, Munich.)

04_Redundo.pdf

12:00 21cm signal sensitivity to dark matter decay

Orateur: Gaétan Facchinetti (ULB)

05_Facchinetti.pdf

12:30 → 13:00 Discussion

13:00 → 14:00 lunch

14:00 → 15:30 Galactic Dynamics: Fameay

Président de session: Benoit Famaey (CNRS Observatoire astronomique de Strasbourg)

14:00 Numerical simulations of galaxies: (biased) status

Orateur: Emmanuel Nezri (LAM)

06_Nezri.pdf

14:30 Galaxy formation and primordial non gaussianities

Orateur: Clément Stahl (ObAS)

07_Stahl.pdf

15:00 Constraints from disk heating

Orateur: Francesca Scarcella (LUPM)

NFTD8Scarcella.pdf

15:30 → 16:00 Cofee break

16:00 → 17:00 Galactic Dynamics

Président de session: Benoit Famaey (CNRS Observatoire astronomique de Strasbourg)

16:00 Introducing the Velocity Dispersion Acceleration Relation and studying it in the case of the Milky Way

Orateur: Giacomo Monari (ObAS)

09_Monari.pdf

16:30 The Large Magellanic Cloud as a dynamical dark matter laboratory

Orateur: Eugene Vasiliev (UK Astronomy Technology center Edinburgh)

talk.pdf

17:00 → 17:30 Discussion

20:00 → 23:30 Conference Dinner

mercredi 13 septembre

10:00 → 11:00 Observations

Président de session: Julien Lavalle (LUPM - Montpellier)

10:00 The Challenges Brought by the JWST Observations of the Distant Universe.

Orateur: Guillaume Mahler (Durham University & U. Liège)

GM-Bruxelles2023-short.pdf

GM-Bruxelles2023-short.pptx

10:30 Constraints on dark matter cores from the tidal evolution of Milky Way satellites

Orateur: Raphaël Errani (ObAS)

bruxelles_25min_rapha.pdf

11:00 → 11:30 Coffee Break

11:30 → 12:30 Observations

Président de session: Julien Lavalle (LUPM - Montpellier)

11:30 Gravitational waves from binary black holes in a self-interacting scalar dark matter cloud

Orateur: Patrick Valageas (IPhT - CEA Saclay)

03_Valageas.pdf

12:00 Gravitational Wave observations with PTA

https://teams.microsoft.com/l/meetup-join/19%3ameeting_MzMyZTA3ZmEtZjc5Zi00YjBlLTkyZTQtZjNhY2E4Nzk0NGRl%40thread.v2/0?context=%7b%22Tid%22%3a%2230a5145e-75bd-4212-bb02-8ff9c0ea4ae9%22%2c%22Oid%22%3a%224e24f1ad-3573-4cd4-98f7-a696774e18ab%22%7d

Orateur: Pierre Auclair (CURL UCLouvain)

auclair_pta.pdf

12:30 → 13:00 Discussion

13:00 → 14:00 Lunch