We revisit the role of a sub-component dark matter in well motivated multi-component dark matter scenarios beyond WIMP. When the sub-component is a messenger between the dark sector and the SM sector, especially in boosted dark matter scenarios, it can provide distinctive signatures in various dark matter and neutrino experiments. In addition, we show the dynamics of a sub-component dark...
The 80% of the matter in the Universe is in the form of dark matter that comprises the skeleton of the large-scale structure called the Cosmic Web. As the Cosmic Web dictates the motion of all matter in galaxies and inter-galactic media through gravity, knowing the distribution of dark matter is essential for studying the large-scale structure. However, the Cosmic Web's detailed structure is...
General Relativity predicts that photons emitted from distant sources can be deflected by intervening gravitational potential between the sources and us. This effect is known as gravitational lensing effect, causing a coherent distortion in the shapes of observed galaxies with a large separation. The lensing effects also provide a powerful means of mapping cosmic mass density distributions and...
In this talk, we use machine learning to analyze 21cm intensity map images of the universe after reionization to explore the dark matter mass. Since dark matter mass affects the matter distribution in the universe at small scale, we can obtain information on dark matter mass by analyzing the distribution of neutral hydrogen in the 21cm intensity map.
In this study, we use hydrodynamic...
If Dark Matter (DM) has a sizable scattering cross section with nucleons, it can efficiently be captured by a neutron star. Its energy is then transferred to the neutron star as heat through the scattering and annihilation inside the star. This heating effect may be detectable via dedicated temperature observations of nearby old pulsars, providing an alternative method for DM searches. We show...
We study the impact of sphaleron-induced thermal friction on the axion dark-matter abundance due to the interaction of an axion-like particle (ALP) with a dark non-abelian gauge sector in a secluded thermal bath. Thermal friction can either enhance the axion relic density by delaying the onset of oscillations or suppress it by damping them. We derive an analytical formula for the frictional...
