Workshop on Very Light Dark Matter 2021

Session

Monday AM

27 Sept 2021, 10:00

Online

Conveners

Monday AM

• Masaki Yamada

8. ABRACADABRA-10cm: First Search for < 1micro-eV Axions

Lindley Winslow

27/09/2021, 10:10

Invited

The axion is an intriguing dark matter candidate that has returned too prominence due to advances in quantum sensors and cryogenic infrastructure. The < 1micro-eV mass range for axions is particularly intriguing due its connection to the GUT-scale. In this talk, I will introduce axion physics in this mass range and present the latest results from ABRACADABRA-10cm’s second physics run.

9. Axion-like particle dark matter and gravitational waves from topological defects

Edoardo Vitagliano

27/09/2021, 10:50

Axion-like particles (ALPs) are a compelling candidate for dark matter (DM). Their production is associated with the formation of a string-wall network. This system must annihilate, producing gravitational waves and non-relativistic ALPs. In my talk I will show that these gravitational waves, if produced at temperatures below 100 eV, could be detected by future cosmological probes for ALPs...

10. Dynamical friction from scalar dark matter

Thomas Helfer

27/09/2021, 11:25

Light bosonic scalars (e.g. axions) may form clouds around black holes via superradiant instabilities, or via accretion if they form some component of the dark matter. It has been suggested that their presence may lead to a distinctive dephasing of the gravitational wave signal when a small compact object spirals into a larger black hole. Motivated by this, we study numerically the dynamical...

11. Hunting Axions Using Astrophysical Observation and Quantum Metrology

Yifan Chen

27/09/2021, 11:50

Ultralight bosons behave like coherent waves when the occupation number is large enough. If they are coupled to the Standard Model sector of the particle physics, such an oscillating background can induce a tiny signal. Near a fast rotating black hole, axion within one order of the mass window can accumulate through superradiance, with a large density saturating the non-linear...

42. Axion dark matter search with gravitational wave detectors: ADAM-GD

Koji Nagano

27/09/2021, 12:15

Axion is a promising candidate for ultralight dark matter which may cause a polarization rotation of laser light. Recently, a new scheme of probing the axion dark matter by optical linear cavities used in the arms of gravitational wave detectors has been proposed. This scheme is called ADAM-GD. If this scheme is applied, the sensitivity to the axion-photon coupling of the ground-based...