Workshop on Very Light Dark Matter 2021

Session

Monday PM

27 Sept 2021, 14:00

Online

Conveners

Monday PM

• Wen Yin

12. Squeezed quantum states of axions

Sugumi Kanno

27/09/2021, 14:00

Invited

In this talk, I will discuss the production of axions from the vacuum caused by the expansion of the Universe. I will show the axions evolve as a squeezed state during inflation and become a highly entangled state. Such a quantum squeezed state of axions remains after horizon re-entry. I also discuss the observability of the quantum coherence of axions.

13. The DAMNED Experiment : Dark matter Scalar field search with Optical Cavity and an Unequal-Delay Interferometer

Etienne Savalle

27/09/2021, 14:40

The DAMNED experiment is a new type of experiment that compares the frequency of a clock to itself in the past, by "storing" photons in a fibre delay line.

In ultra-light oscillating dark matter (DM) models, the coupling of DM to the standard model fields yields an oscillation of fundamental constants, which in turn leads to oscillations of the cavity and fibre lengths and of the fibre...

14. Search for ultra-light dark matter with the Shuket experiment

Pierre Brun

27/09/2021, 15:05

P. Brun, L. Chevalier, C. Flouzat, A. Hees, P. Polovodov, E. Savalle, P. Wolf
The Shuket experiment aims at detecting light scalar dark matter in the form of hidden photons. Shuket stands for SearcH for U(1) darK matter with an Electromagnetic Telescope, it is designed as a metallic spherical cap with a radiometer at its center. We present the results of a re-analysis of a dataset presented...

15. Exploring Dark Matter ALPs and FIPs

Joerg Jaeckel

27/09/2021, 15:40

Invited

In this talk we will look at axion-like particles, and other very feebly interacting (light) dark matter candidates. In particular we will look at some more unusual features and models.

16. Searching for axion-like particles under strong gravitational lenses

Yuko Urakawa

27/09/2021, 16:20

Invited

We establish strong gravitational lens systems as robust probes of axion-like particles (ALPs) -- a candidate for dark matter. A tiny interaction of photons with ALPs induces birefringence. Multiple images of gravitationally lensed polarised objects allow differential birefringence measurement, alleviating systematics and astrophysical dependencies. We apply this novel method to the lens...

17. Searching Dark Matter with Galileo satellites

Alexandra Sheremet

27/09/2021, 17:00

The search of transient space variation of fundamental constant, like the fine structure constant or the proton-to-photon mass ratio in the neighborhood of the Earth, is the interest of last decades. In this context, atomic clocks can present an astonishing tool for study fundamental physics in terms of detection of a possible frequency shift, which is a result of GPS network interaction with...