Workshop on Very Light Dark Matter 2021

Session

Tuesday PM

28 Sept 2021, 14:00

Online

Conveners

Tuesday PM

• Yuta Michimura

18. Searching for Axion Echos from Supernova Remnants

Chen Sun

28/09/2021, 14:00

In this talk, I will discuss possible constraints on the axion-photon coupling arising from supernova remnants. I will assume axion to be dark matter and focus on the echo signal from its stimulated decay process, which is caused by photons in the radio band emitted from supernova remnants. I will show that this could put competitive bounds in the mass range of $10^{-6}$ eV to $10^{-4}$ eV.

19. Pre-supernova Axion-like Particles and Their Detectability

Kanji Mori

28/09/2021, 14:15

Ultralight axion-like particles (ALPs) are a candidate of dark matter particles. We calculate the production of ALPs in a nearby supernova progenitor. Once produced, ALPs escape from the star and a part of them is converted into photons during propagation in the Galactic magnetic field. We report that the MeV photon flux that reaches Earth may be detectable by gamma-ray telescopes for ALPs...

24. Supernova constraint on the light dark particles

Meng-Ru Wu

28/09/2021, 14:30

The well-established supernova bound on sub-GeV particles in the dark sectors has been applied to various dark sector candidates, including axion, dark photon, sterile neutrinos, etc. Recently, we found that on one hand one can extend the supernova bound by considering the decay of dark particles in the stellar envelope that can add energy to the explosion of the supernova [1]. On the other...

29. Searching for ultralight bosons with supermassive black hole ringdown

Adrian, Ka-Wai Chung

28/09/2021, 14:45

One class of competitive candidates for dark matter are ultralight bosons.

If they exist, these bosons may form long-lived bosonic clouds surrounding rotating black holes via superradiant instabilities, acting as sources of gravity and affecting the propagation of gravitational waves around the host black hole.

During extreme-mass-ratio inspirals, the bosonic clouds will survive the...

26. Dark Photon Limits: A Cookbook

Alexander Millar

28/09/2021, 15:15

The dark photon is a massive hypothetical particle that interacts with the Standard Model by kinetically mixing with the visible photon. Due to the similarity with the electromagnetic signals generated by axions, many putative bounds on dark photon signals are simply reinterpretations of historical bounds set by axion haloscopes. However, the dark photon has a property that the axion does not:...

25. The imprint of ultralight vector dark matter on gravitational-wave propagation

Alfredo Delgado Miravet

28/09/2021, 15:40

In this talk we analyse the effect of ultralight vector dark matter on gravitational-wave propagation. We find that the presence of the field produces an anisotropic suppression of the gravitational-wave amplitude, which depends on the mass and the abundance of the field. The effect is sizable for primordial gravitational waves, and could be detected with forthcoming cosmic microwave...

27. Constraints on dark photon dark matter using data from LIGO’s and Virgo’s third observing run

Andrew Miller

28/09/2021, 16:05

Invited

We present a search for dark photon dark matter that could couple to gravitational-wave interferometers using data from Advanced LIGO and Virgo’s third observing run. To perform this analysis, we use two methods, one based on cross-correlation of the strain channels in the two nearly alignedLIGO detectors, and one that looks for excess power in the strain channels of the LIGO and Virgo...

28. Direct limits for scalar field dark matter from a gravitational-wave detector

Sander Vermeulen

28/09/2021, 16:45

We report on the first direct search for scalar field dark matter utilising a gravitational-wave detector. Scalar field dark matter is predicted to cause oscillations of fundamental constants, which in turn would drive oscillations of the size and index of refraction of the beamsplitter in an interferometer. This would thus produce an oscillatory signal in a gravitational-wave detector at a...

44. Ultralight Vector Dark Matter search with KAGRA

Jun'ya Kume

28/09/2021, 17:10

Gravitational Wave interferometer can be used for measuring the small displacement of the test masses due to the Ultralight vector dark matter (DM). However, the effects of the vector DM to the different mirrors are mostly common and the sensitivity is largely reduced, if they are made of the same material. Here, we would like to emphasize that KAGRA employs sapphire test masses and fused...