Opening Remarks

• Michael Witherell

New Technologies for Axion Detection

• Yonatan Kahn (University of Illinois Urbana-Champaign)

QCD axions: astrophysical parameter space and high-mass searches

• Masha Baryakhtar

Echoes of Axion Dark Matter and Axion Stars

• Yitian Sun

Kinetic/Acoustic Misalignment and baryon asymmetry

• Keisuke Harigaya (University of Chicago)

Searching for Axions and High-Frequency Gravitational Waves with ABRACADABRA-10cm

• Kaliroe Pappas

Quantum Sensing for DMRadio with Radio-frequency Quantum Upconverters

• Cady van Assendelft (Stanford University)

Dark Matter Searches on Photonic Chips

• Christina Gao

Observation of the Axion quasiparticle

• Suyang Xu

Axions and String Theory: General Remarks

• Edward Witten

String Compactifications with Many Axions

• Liam McAllister

Testing unification and heterotic strings with axions

• Mario Reig (University of Oxford)

In this talk I will discuss axion couplings to gauge bosons in 4-dimensional Grand Unified Theories and in heterotic String Theory. The topological nature of these couplings allows them to be matched from the UV to the IR, and the ratio of the anomaly with photons and gluons for any axion is fixed by unification. I will show that this implies that there is a single axion — the QCD axion — with an anomalous coupling to photons. Other light axion-like particles can couple to photons by mixing with the QCD axion, and necessarily lie to the right of the QCD line prediction in the mass-coupling plane. As a result, a discovery of an axion to the left of the QCD line can rule out simple GUTs and most of the studied heterotic string compactifications. (Based on: 2206.07053 and 2410.03820)

Imperfect Axions

• Luca Di Luzio (INFN Padua)

Axion Signatures from Supernovae and Neutron Stars Mergers: A Full-Sky Search with GALAXIS

• Claudio Andrea Manzari (LBNL & UCB)

Indirect probes of QCD axion with Fast Radio Burst Timing

• Huangyu Xiao (Fermilab)

Status and Future of ADMX

• Gray Rybka (University of Washington)

QCD Axion Dark Matter Searches with HAYSTAC, ALPHA, and RAY

• Reina Maruyama

Quantum-limited magnetic resonance detection for the CASPEr axion dark matter search

• Alex Sushkov

DMRadio-GUT: a future lumped-element search for GUT-motivated QCD axions

• Chiara Salemi (UC Berkeley and LBNL)

Magnet technologies for GUT-scale axion searches

• Soren Prestemon

Hunting for QCD Axion Dark Matter with the Princeton Axion Search

• Saptarshi Chaudhuri

A Loophole in the Isocurvature Bound on the QCD Axion

• Peter W. Graham (Stanford University)

Superradiant Interactions of Cosmic Relics

• Savas Dimopoulos

Simons Foundation Vision for Dark Matter and Axions

• David Spergel

DOE Vision for Dark Matter and Axions

• Manuel Bautista

P5 / APS Vision for Dark Matter and Axions

• Hitoshi Murayama

Axion dark matter explains the formation of supermassive black holes at cosmic dawn

• Pierre Sikivie

TBA

• Dmitry Budker

Solar Axions with the International Axion Observatory (IAXO) and BabyIAXO

• Kerstin Perez

Searching for Dark Sectors with Superconducting RF Cavities

• Asher Berlin

The Superconducting Heterodyne Approach to Axion Detection

• Kevin Zhou

“Hybrid-Superconducting” Cavities with ADMX Sidecar

• Nick Du (Lawrence Livermore National Labs)

ARIADNE: Recent Progress and Future Outlook

• Alexander Hipp (Northwestern Univeristy)

The Piezoaxionic Effect: dark matter detection and new forces

• Amalia Madden (KITP)

A quantum protocol for observing superradiant interactions of cosmic relics

• Marios Galanis (Perimeter)

Learning our place in the Axiverse

• David Cyncynates (University of Washington, Seattle)

QCD Axion Dark Matter in String Theory

• Naomi Gendler (Harvard University)

SHADE and Beyond at SQMS

• Bianca Giaccone

ALPS II: axion searches without the dark matter paradigm

• Axel Lindner

DMRadio-m3: a proposed QCD axion search

• Chelsea Bartram

Detecting meV axions: Broadband Reflector Experiment for Axion Detection (BREAD)

• Stefan Knirck (Fermi National Accelerator Laboratory)

We present BREAD (Broadband Reflector Experiment for Axion Detection). BREAD is a novel, scalable approach to detect meV axions using a dish antenna in high-field solenoid magnets. Several orders of axion mass around the meV range are particularly well motivated by the post-inflationary symmetry breaking scenario for the QCD axion. We present first results with BREAD prototypes, including the world's first search for axion-like particles with a dish antenna, and discuss future avenues for increasing sensitivity and mass range.

The Dark Wave Lab: A Proposal for Shared Magnet and Cryogenic Facilities for Axion Searches at Fermilab

• Andrew Sonnenschein (Fermilab)

Closing remarks