Workshop on Very Light Dark Matter 2023

Session

Afternoon session-3

Mar 28, 2023, 5:00 PM

Mario Royal Kaikan (Chino, Nagano) + Online

Conveners

Afternoon session-3

• Motoko Fujiwara

28. How axions change stars

Konstantin Springmann

3/28/23, 5:00 PM

Lighter than expected QCD axions can get destabilized in sufficiently dense and large objects such as white dwarfs and neutron stars. Once the axion is sourced the mass of nucleons within the star is reduced, leading to a new ground state of nuclear matter. I will show that white dwarfs in this absolutely stable phase would look very different from what is observed, allowing us to set novel...

9. Probing ultra-light dark matter with lensed gravitational waves

Miguel Zumalacarregui

3/28/23, 5:40 PM

Probing cosmic structures with gravitational wave lensing Just like light, gravitational waves (GWs) are deflected and magnified by the large-scale structure of the Universe. Their low frequency, phase coherence and capacity to propagate with no absorption make GW lensing highly complementary to gravitational lensing of electromagnetic radiation. I will discuss the framework of lensing in the...

10. Motion of S2 and bounds on scalar clouds around SgrA*

Arianna Foschi

3/28/23, 6:00 PM

The motion of S2, one of the stars closest to the Galactic Centre, has been measured accurately and used to study the compact object at the centre of the Milky Way. It is commonly accepted that this object is a supermassive black hole but the nature of its environment is open to discussion. Here, we investigate the possibility that dark matter in the form of an ultralight scalar field “cloud”...