Workshop on Physics of Dark Cosmos: dark matter, dark energy, and all

Session

Dark Matter

22 Oct 2022, 09:30

Lavalse Hotel Busan 2F

Conveners

Dark Matter: 1

• Jong-Chul Park ()

Dark Matter: 2

• Hyun Min Lee ()

Dark Matter: 3

• Sang-hui Im ()

Contribution list Timetable

43. On the WIMP dark matter signature in old neutron stars

Prof. Natsumi Nagata

22/10/2022, 09:30

Weakly Interacting Massive Particles (WIMPs) in the Universe accumulate in neutron stars (NSs) through their interactions with ordinary matter, and their annihilation inside the NS core causes late-time heating. It has been argued that this heating effect maintains the surface temperature of old NSs to be a few thousand K, which can be regarded as a smoking gun signature of dark matter (DM)...

44. Dark matter signals from charged mesons in neutrino experiments

Dr Doojin Kim

22/10/2022, 10:00

Neutral mesons such as pi0 and eta have played a role of an important source of dark sector particles including dark matter in the beam-dump type and neutrino experiments. We point out that charged mesons are another important but overlooked source of dark sector particles especially in the beam-focused neutrino experiments. The idea is that a charged meson decays to a charged lepton, a...

45. Cosmic-ray-induced Boosted Dark Matter

Prof. Jong-Chul Park

22/10/2022, 11:00

In this talk, we review boosted dark matter (BDM) production mechanisms via extended dark sectors and charged cosmic rays. Next, we propose a novel dark-matter boosting mechanism by cosmic-ray neutrinos. The new mechanism is so significant that the arriving flux of cosmic-ray neutrino BDM (νBDM) lighter than O(1-10) MeV on Earth is substantially larger than the one of the cosmic-ray electron...

46. Manifesting hidden dynamics of a sub-component dark matter

Prof. Seodong Shin

22/10/2022, 11:30

A distinctive cosmological dynamics of a sub-component dark matter will be discussed. The thermal evolution of the sub-component is significantly affected by the sizable self-scattering and the required annihilation cross section of the sub-component sharply increases as we consider a smaller relative abundance fraction among the dark-matter species. Therefore, contrary to a naive expectation,...

47. Detecting axion dark matter with chiral magnetic effects

Prof. Sang Hui Im

22/10/2022, 12:00

We show that dark matter axions or axion-like particles (ALP) induce non-dissipative alternating electric currents in conductors along the external magnetic fields due to the axial anomaly, realizing the chiral magnetic effects. We propose a new experiment to measure this current to detect the dark matter axions or ALP. This non-dissipative currents are the electron medium effects, directly...

48. Positivity bounds for scalar dark matter

Dr Kimiko Yamashita

22/10/2022, 16:00

We study the positivity bounds implication on dimension-8 Higgs-portal dark matter production in the early universe. The relevant operators are subject to satisfying positivity bounds when the UV physics follows the S-matrix based on the fundamental pillars of quantum field theory. We present how positivity bounds limit the model parameter space of dark matter production and show the interplay...

49. An Asymmetric SIMP Dark Matter Model

Dr Shu-Yu Ho

22/10/2022, 16:30

In this talk, we will show for the first time an asymmetric strongly interacting massive particles (SIMP) dark matter (DM) model, where a new vector-like fermion and a new complex scalar both having nonzero chemical potentials can be asymmetric DM particles. After the spontaneous breaking of a U(1)𝖣 dark gauge symmetry, these two particles can have accidental ℤ4 charges making them stable. By...

51. Positronium decays with a dark Z and fermionic dark matter

Dr Dong-Won Jung

22/10/2022, 17:00

We investigate the invisible decay of positronium to probe the fermionic light dark matter mediated by the dark Z boson. The invisible decay rate of positronium through weak interaction in the standard model is too small to be detected in the experiment. We show that it can be enhanced to be observed in the future if the dark matter is lighter than the electron in the dark Z model. We also...

36. Cosmology in a SUSY B-L model

Prof. Wan-Il Park

22/10/2022, 17:30

I will discuss some cosmological implications of a SUSY B-L model, including dark matter and gravitational waves

50. TBA

Dr Neil Barrie

TBA