Axions in the Lab and in the Cosmos

15 Jul 2019, 08:00 → 19 Jul 2019, 20:30 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

This week-long CERN-Korea TH Institute will concentrate on recent progress and open questions in axion physics.

Topics to be covered include:
(1) The QCD axion: couplings, laboratory/astro/cosmo constraints.
(2) Axion cosmology: thermal and non-thermal production, axion dark matter, structure formation. Topological defects.
(3) Theoretical ideas on axion detection: from stellar probes to lab-based proposals for axion detection, highlighting new ideas.
(4) Ultra-light axion-like particles and cosmological implications.

 

Organizers: Kfir Blum, Babette Dobrich, Deog Ki Hong, Seung J. Lee, Matthew McCullough, Hyun Min Lee, Benjamin Safdi

Monday, 15 July

09:00 → 10:00 Coffee

10:00 → 11:00 Astro/cosmo probes of axions/ALPs

Speaker: Asimina Arvanitaki

CERNJuly2019 Arvanitaki.key

13:30 → 14:30 Discussion : Dynamical relaxation in a fuzzy dark matter halo

Speaker: Scott Tremaine

tremaine talk.pdf

14:30 → 15:00 Coffee

15:00 → 16:00 Relic abundance of QCD axion DM

Speaker: Giovanni Villadoro

2019-CERN-2a.pdf

16:00 → 17:00 Discussion: Relic abundance of axions

Speaker: Malte Buschmann (JGU Mainz)

CERN MB.pdf

Tuesday, 16 July

09:00 → 10:00 Coffee

10:00 → 11:00 Higgs portal with an ALP

Speaker: Kwang Sik Jeong

ALP-Higgs-Portal.pdf

11:15 → 12:15 Discussion: ALP cosmology and its experimental implications

Speaker: Fuminobu Takahashi

Takahashi0716.pdf

14:30 → 15:00 Coffee

15:00 → 16:00 Overview of lab searches for axions

Speaker: Andreas Ringwald (Deutsches Elektronen-Synchrotron DESY)

CERN_Korea_TH_Institute_AR.pdf

Wednesday, 17 July

09:00 → 10:00 Coffee

10:00 → 11:00 A model-building perspective on axion couplings

Speaker: Jihn E. Kim (Kyung Hee University)

CERN19ThInst.key

11:00 → 12:00 Discussion: Axion model-building

Speaker: Keisuke Harigaya (Institute for Advaned Study)

axion2019.pdf

13:30 → 18:30 Excursion: Free afternoon in Annecy (France)

Thursday, 18 July

09:00 → 10:00 Coffee

10:00 → 11:00 Outstanding problems in axion cosmology

Speaker: David J. E. Marsh

marsh_1.pdf

marsh_1.pptx

13:30 → 14:30 Discussion: Substructure in an axion dark matter halo — from vortices to black hole hair

Speaker: Lam Hui (Columbia University)

14:30 → 15:00 Coffee

16:30 → 17:30 CERN Colloquium: https://indico.cern.ch/event/831477/

Friday, 19 July

09:00 → 10:00 Coffee

10:00 → 11:00 The QCD axion at aLIGO

Speaker: Maria Baryakhtar

11:00 → 12:00 Discussion: Astrophysical signatures of/bounds on axions

Speakers: Alessandro Mirizzi, Koichi Hamaguchi

201907_CERN-axion KH.pdf

cern_axions AM.pdf

14:30 → 15:00 Coffee

15:00 → 16:00 The Axion Echo method and the Big Flow

Electromagnetic radiation with angular frequency half the
axion mass stimulates the decay of dark matter axions and
produces an echo, i.e. faint electromagnetic radiation
traveling in the opposite direction. Thus one may search
for axion dark matter by sending out to space a powerful
beam of electromagnetic radiation and listening for its
echo. The method is particularly attractive if the Earth
is bathed in a cold axion flow of known direction. The
Caustic Ring Model of the Milky Way halo predicts such a
cold flow with high local density, called the Big Flow. The direction of the Big Flow is determined from triangular
features in the IRAS and GAIA maps of the Milky Way with a
precision of order 0.5 degree of arc.

Speaker: Pierre Sikivie (University of Florida)

CERN2019 PS1.pdf

16:00 → 16:30 Workshop summary

Convener: Pierre Sikivie

CERN_2019 PS2.pdf