首页

2024.09.26

Quest for the origin of neutrinos

<p>The discovery of neutrino oscillation established a non-zero mass of neutrino. &nbsp;The origin of neutrino and its non-zero mass is an one of the most important experimental clues to the new physics beyond the standard model. &nbsp;Neutrinos are ubiquitous in the universe, accompanying most of the weak-interacting physics processes. I shall review natural and artificial sources of neutrinos with an emph...</p>

2024.09.19

Dynamic and Untamed: the early life of circumstellar disks

<p>Circumstellar disks as young as 0.5 Myr bear gaps and rings as tentative planet signposts, which aligns with accumulating evidence of early planet formation. However, such young disks are poorly understood both observationally and theoretically. They are likely affected by the star formation environment becoming warped or eccentric. The disk flow can become peculiar, and various instabilities f...</p>

2024.09.12

Supermassive black holes in the Universe

<p>Supermassive black holes are extensively discussed in this talk:&nbsp;1) cosmic evolution of SMBHs;&nbsp;2) masses and spins;&nbsp;3) SMBH binaries and nano-Hz gravitational waves;&nbsp;4) Satellite black holes around SMBH;&nbsp;5) new opportunity of SMBH research in the JWST and VLTI era.BIOJianming Wang is astrophysics professor in IHEP. He got PhD in USTC in 1995 and originally from National University of Defense Te...</p>

2024.08.19

Beyond Summary Statistics: Leveraging Generative Models for Field-Level Weak Lensing Analysis

<p>Current and future weak lensing surveys contain significant information about our universe. However, their optimal cosmological analysis is challenging, with traditional analyses often resulting in information loss due to reliance on summary statistics like two-point functions. While deep learning methods offer promise in capturing the complex non-linear features of these cosmological fields, t...</p>

2024.08.23

Role of dark matter halo angular momentum distribution on bar formation, evolution and dynamical friction

<p>In this study, we investigated the role of the inner halo&#39;s angular momentum distribution on bar formation and evolution processes. We performed a series of high-resolution N-body experiments with Milky Way-type disk galaxies. These models were initiated with similar disks but with varying inner halo angular momentum in the surrounding dark matter halo. The bar triggered earlier in the model wi...</p>

2024.08.16

Unveiling the Milky Way Dust Extinction Curve in 3D

<p>Despite the vital importance of interstellar dust to many areas of astronomy, its composition and properties are highly uncertain. The dust extinction curve (the relation of extinction vs. wavelength) depends on both the grain-size distribution and the chemistry of the dust, and is therefore a probe of dust properties. The dust extinction curve is typically characterized by R(V) ≡ A(V)/E(B − ...</p>

2024.07.02

Analytical Insights into Dark Matter Deficient Galaxies

<p>Recent observations reported a puzzling dearth of dark matter (DM) in a fraction of massive high-z galaxies and dwarf galaxies, challenging current simulation predictions within the standard ΛCDM scenario. This discrepancy underscores our limited understanding of the halo and galaxy structural evolution. Here, I will present a novel unified analytical framework for galaxy dynamical evolution d...</p>

2024.07.02

New Results in Three-Dimensional Core-Collapse Supernova Theory

<p>The theory of core-collapse supernova (CCSN) has evolved significantly in the past few years with the help of &nbsp;long term 3D simulations. In this talk, I will present many new scientific results based on the large set of CCSN simulations calculated by the code Fornax, focusing on the important role of three dimensional effects. I will talk about theoretical observables such as explosion energy, ...</p>

2024.06.26

Revealing Dark Matter under the Lens

<p>Unveiling the true nature of Dark Matter (DM), which manifests itself only through gravity, is one of the principal quests in physics. Leading candidates for DM are weakly interacting massive particles (WIMPs) or ultralight bosons (axions), at opposite extremes in mass scales, that have been postulated by competing theories to solve deficiencies in the Standard Model of particle physics. Wherea...</p>

2024.06.28

Gaia + Bayesian Power: A Deep Dive into Open Cluster Mass Function & Binaries

<p>Open clusters (OCs) are cradles of stars and building blocks of galaxies, offering insights into how stars and galaxies form. It is essential to precisely measure the parameters of OCs, such as age, metallicity, distance, dust extinction, stellar mass function (MF), and binary fraction. I propose a novel Bayesian framework that can identify OC candidates and simultaneously estimate these parame...</p>