News from the Dark 10

10 sept. 2025, 09:00 → 12 sept. 2025, 17:00 Europe/Paris

Salle Kouros 2 (Montpellier)

Julien Lavalle (LUPM - Montpellier), Francesca CALORE, Benoit Famaey (CNRS Observatoire astronomique de Strasbourg), Emmanuel Nezri (Laboratoire d'Astrophysique de Marseille), Patrick VALAGEAS (CEA Saclay), Vivian Poulin (LUPM (CNRS & U. de Montpellier))

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 ninth edition of this workshop series (previous editions: 2013, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024).

The 2025 meeting will take place both in Montpellier (Sept. 10 and 12), Campus Saint-Charles, and in the neighbor seaport city Sète at the historical Station Marine (Sept. 11), 30 min away from Montpellier by train.

The social dinner will be organized in restaurant La Péniche in Sète.

Invited speakers include James Binney, Lasha Berezhiani, Kim Boddy (TBC), Jose Cembranos, Raphael Errani, Malcolm Fairbairn, Neige Frankel (TBC), Xucheng Gan, Daniel Gilman, Chris Hamilton, Vid Irsic, Florian Kühnel, Thomas Montandon, Sergio Sevillano, Elsa Teixeira, Hans Winther, Sam Witte, Yue Zhao, and others.

This meeting is partly supported by LUPM, the CNRS-INSU National Program PNHE, the ANR under contract ANR-18-CE31-0006 (the GaDaMa project), and by the ERC projects GREATDIGINTHESKY and NEWRECORDS.

mer. 10 septembre

09:30 Welcome coffee

1 Introduction

Orateur: Julien Lavalle (LUPM - Montpellier)

2 Cosmology: summary of recent measurements and status of LCDM (30'+15')

Orateur: Théo SIMON (Montpellier Universe and Particles Laboratory - CNRS)

3 What Ly-alpha data tell us about dark matter (30'+15')

Orateur: Dr Vid Irsic

4 Probing dark matter - neutrino interactions in cosmology (30'+15')

Orateur: Dr Markus Mosbech

12:30 Lunch break

5 Cosmological simulations with baryons: a status (30'+15')

Orateur: Dr Isabel Santos

6 Cosmological simulations with axion-like dark matter (30'+15')

Orateur: Dr Hans Winther

7 GW detectors to search for new physics beyond the Standard Model (30'+15')

Orateur: Prof. Yue Zhao

16:15 Coffee break

8 Neutron stars as axion laboratories (30'+15')

Orateur: Dr Sam Witte

9 Laboratory searches for axions (30'+15')

Orateur: Dr Xucheng Gan

18:15 Discussion

jeu. 11 septembre

10 Subhalos viewed in cosmological simulations (30'+15')

Orateur: Dr Arturo Nuñez-Castiñeyra

10:15 Coffee break

11 Looking for subhalos with lensing (30'+15')

Orateur: Dr Daniel Gilman

12 Probing the matter power spectrum on sub-Mpc scales (30'+15')

Orateur: Dr Sergio Sevillano

12:15 Lunch break

13 Microgalaxies in LCDM (30'+15')

Orateur: Dr Raphael Errani

14 Stellar migration in the Milky Way from adiabatic growth/heating of the disk (30'+15')

Orateur: Dr Neige Frankel

15 Heating of disky systems with dark matter objects: Milky Way disk vs. exoplanetary systems (30'+15')

Orateur: Théo Paré

16:15 Coffee break

16 Milky Way disk heating constraints on ULDM (30'+15')

Orateur: Dr Chris Hamilton

17 PBH-star binaries: a potentially new population of binaries (30'+15')

Orateur: Nicolas Esser

18:15 Free time in Sète

19:00 Dinner

ven. 12 septembre

18 Dark matter models: where do we stand now? (30'+15')

Orateur: Prof. Malcolm Fairbairn

19 Superfluid dark matter (30'+15')

Orateur: Dr Lasha Berezhiani

10:30 Coffee break

20 Dark matter production from bubbles (30'+15')

Orateur: Prof. Jose Cembranos

21 PBHs: Memory burden as a brake to Hawking's radiation (30'+15')

Orateur: Dr Florian Kühnel

12:30 Lunch break

22 Dark energy interacting with dark matter (30'+15')

Orateur: Elsa Teixeira (LUPM Montpellier)

23 Cosmological constraints on decaying dark matter (30'+15')

Orateur: Thomas Montandon (Laboratoire Univers et Particule de Montpellier (LUPM))

24 Carte blanche (30'+15')

Orateur: Prof. James Binney

16:00 Coffee break / end of workshop