Workshop on Very Light Dark Matter 2023

Session

Afternoon session-2

28 Mar 2023, 15:20

Mario Royal Kaikan (Chino, Nagano) + Online

Conveners

Afternoon session-2

• Yuko Urakawa

8. Probing Axions through Tomography of Anisotropic Cosmic Birefringence

Alessandro Greco

28/03/2023, 15:20

Cosmic birefringence is the in-vacuo rotation of the linear polarization plane experienced by photons of the Cosmic Microwave Background (CMB) radiation when theoretically well-motivated parity-violating extensions of Maxwell electromagnetism are considered. If the angle parametrizing such a rotation is dependent on the photon's direction, then this phenomenon is called Anisotropic Cosmic...

7. Search for vector dark matter in microwave cavities with Rydberg atoms

Jordan Gué

28/03/2023, 15:40

In this talk, I present a proposal of an experiment based on 1) the application of a strong electric field inside a microwave cavity and 2) electrometry using Rydberg atoms. This kind of experiment could be extremely useful at detecting dark photons through the stationary electric field filling the whole space it induces. The sensitivity of this experiment is quite constant over a significant...

29. Impact of HWP systematics on the measurement of cosmic birefringence from CMB polarization

Marta Monelli

28/03/2023, 16:00

Employing an half-wave plate (HWP) as polarization modulator is a promising strategy to mitigate systematics in CMB experiments. However, if not calibrated well enough or accounted for correctly in the analysis, its non-idealities represent an additional source of systematics that can impact the science extracted from CMB. In this talk, I will show how their effect on the observed angular...

18. Complementarity Probes of light dark sector via Gravitational Waves and Laboratories

Anish Ghoshal

The non-thermal production of dark matter (DM) usually requires very tiny couplings of the dark sector with the visible sector and therefore is notoriously challenging to hunt in laboratory experiments. Here we propose a novel pathway to test such a production in the context of a non-standard cosmological history, using both gravitational wave (GW) and laboratory searches. We investigate the...

19. Cosmic evolution and thermal stability of Barrow holographic dark energy in a nonflat Friedmann-Robertson-Walker Universe

Gaetano Luciano

We study the cosmological evolution of a nonflat Friedmann-Robertson-Walker Universe filled by pressureless dark matter and Barrow holographic dark energy (BHDE). The latter is a dark energy model based on the holographic principle with Barrow entropy instead of the standard Bekenstein-Hawking one. By assuming the apparent horizon of the Universe as IR cutoff, we explore both the cases where a...

23. Probing Virtual ALPs Using Precision Phase Measurement

Mohammad Sharifian

We propose an experimental scheme for detecting the effects of off-shell axion-like particles (ALPs) through optical cavities. In this proposed experiment, linearly polarized photons are pumped into an optical cavity where an external time-periodic or space-periodic magnetic field is present. The magnetic field mediates an interaction between the cavity photons and ALPs giving rise to a...