Spring 2025 Schedule
Feb. 18, 2025
Daniel Wang
UMass Amherst
[CANCELED] Exploring the Galactic Core: The mysteries of Sagittarius A* - our supermassive black hole
Host: Ting-Wen Lan
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
The presence of supermassive black holes (SMBHs) in galaxies is well known. But why most of them remain silent in today's Universe is poorly understood. Sgr A* at the center of our Milky Way Galaxy is an asymptotic example of such a low-luminosity SMBH. The proximity of Sgr A* provides a unique opportunity to observe and understand the dynamics of black hole activity and its interplay with its Galactic nuclear environment. Based primarily on deep X-ray observations and computer simulations, I will discuss what Sgr A* has been doing recently and how this interplay may have determined the life cycle of black hole activity and other galactic nuclear processes that profoundly affect the structure and evolution of our Galaxy. Such studies, complemented by observations of other nearby SMBHs and their environments, provide insights into the functioning of galactic ecosystems and astrophysical processes under extreme conditions.
Brief Bio
Daniel Wang is a professor in the Astronomy Department at University of Massachusetts Amherst. He received his Ph.D. in astronomy in 1990 from Columbia University and was awarded the 1992 ASP Robert J. Trumpler Award for Outstanding North American Ph.D Dissertation Research in Astronomy. He was then a NASA Edwin P. Hubble Postdoctoral Fellow at the University of Colorado and later a Lindheimer Fellow at Northwestern University. He was also a member of the Institute for Advanced Study at Princeton and a Raymond and Beverley Sackler Distinguished Visiting Astronomer at the University of Cambridge. He was honored first as the Siyuan Visiting Professor and later as the Yixing Visiting Chair Professor in the School of Astronomy and Space Science at Nanjing University, later as a US Fulbright Scholar and a visiting professor at Pontificia Universidad Catolica de Chile, and as a visiting professor at Tsung-Dao Lee Institute and Shanghai Jiao Tong University. He is currently a visiting scientist at ASIAA. His research is primarily on high-energy astrophysics, covering a broad range of topics: compact objects, stellar feedback, and the hot circumgalactic/intergalactic media, as well as galactic nuclei and their environments.
Feb. 25, 2025
J. Xavier Prochaska
UC Santa Cruz
Three Decades of Science in Silhouette
Host: Ting-Wen Lan
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
I will discuss a perspective on counting and locating the majority of our Universe's baryons from the scant signatures imprinted on the light and signals of distant sources (quasars and fast radio bursts). These data offer what I consider the most robust measurement of a cosmological parameter (the baryonic mass density) and I'll describe previous and ongoing efforts to establish where the majority of this matter resides. If time permits, I'll briefly detail my new adventure to measure – again in silhouette – the constituents of our Earth's oceans (e.g. phytoplankton).
Brief Bio
J. Xavier Prochaska is a distinguished professor at the University of California Santa Cruz. He is also an associated member of the Kavli IPMU at the University of Tokyo and the National Observatory of Japan. He received his PhD from UC San Diego in 1998 and after that he joined the Carnegie Observatories as a Carnegie and Hubble fellow. In 2002, he became a faculty member at UCSC. He has been working on probing the distribution of baryons in various forms, diffuse gas, molecules in and out of galaxies across cosmic time by utilizing both the collecting power of large telescopes, including the Hubble Space Telescope, the Keck telescope in optical, and ALMA in radio, as well as the statistical power provided by large sky surveys, including the SDSS and DESI. He is one of the pioneers in applying machine learning (ML) techniques to astronomical datasets. Several years ago, he established a team to study the nature of fast radio bursts and search for their host galaxies. With such information, along with his collaborators, Prof. Prochaska resolved the so-called missing baryon problem. In addition to astrophysics, he has been working on physical oceanography and is currently an affiliate faculty member of the Ocean Sciences Department at UCSC. In 2023, he received the Simons Pivot Fellowship to support his exploration in oceanography.
Mar. 04, 2025
Sinya Aoki
YITP, Kyoto
Conservation laws and gravity
Host: Jiunn-Wei Chen
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
In this colloquium, I discuss conservation laws in a presence of gravity including general relativity. After an introduction, contents of my colloquium are
I. Energy non-conservation in general relativity
I-1. Why is energy conserved?
I-2. Energy non-conservation in general relativity: Expanding Universe
I-3. Cases for energy conservation in a curved spacetime
II. Gravitational fields carry energy? Noether’s 2nd theorem and general relativity
II-1. Energy of gravitational field?
II-2. Noether’s 2nd theorem
II-3. Noether’s 2nd theorem in general relativity
III. Conserved charge in curved spacetime (including GR)
III-1. Proposal for a conserved charge
III-2. Perfect fluid and Stefan-Boltzmann law
III-3. A simple model of expanding Universe (scalar+radiation)
IV. Summary
Questions and comments during my presentation are very welcome.
Brief Bio
Professor Sinya Aoki is the director of the Yukawa Institute for Theoretical Physics at Kyoto University. He received his PhD in 1987 from the University of Tokyo. After postdoctoral terms at Brookhaven National Laboratory and the State University of New York, Stony Brook, in the USA, he joined the faculty of the University of Tsukuba in 1991. He then moved to the Yukawa Institute for Theoretical Physics at Kyoto University in 2013 and later served as the Director of the Institute.
Professor Aoki is an expert in theoretical high-energy physics, especially in Lattice Quantum Chromodynamics (LQCD). A new phase structure he discovered as a graduate student is now commonly referred to as "Aoki fingers." His research on Nuclear Force from Lattice QCD with Hatsuda and Ishii was awarded the prestigious Nishina Memorial Prize in 2012 and the MEXT Commendation for Science and Technology in 2014.
Mar. 11, 2025
Jiadong Zang
University of New Hampshire
An artificial intelligence era of magnetism
Host: Danru Qu / Shao-Yu Chen
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Magnetic materials play a crucial role in numerous aspects of daily life, yet their choice remains limited, and discovering new ones is highly challenging. In recent years, the emergence of machine learning and artificial intelligence has revolutionized materials discovery, offering new hope for identifying novel functional magnetic materials. However, a comprehensive database of magnetic materials is still lacking. In this talk, we address this challenge by leveraging advanced large language models to extract material properties from experimental data reported in peer-reviewed journal articles. The database currently includes more than 30,000 magnetic materials and still keeps growing. Our database is highly inclusive and also encompasses superconductors and thermoelectric materials. We hope this resource accelerates materials discovery and paves the way for a new era in magnetism. No background on magnetism and condensed matter is required for this talk.
Brief Bio
Prof. Jiadong Zang received bachelor’s degree in 2007 and PhD degree in 2012, both from Fudan University. He was a postdoctoral fellow in the Institute of Quantum Matter at the Johns Hopkins University during 2012-2015. In 2015, he joined the Department of Physics at the University of New Hampshire (UNH) as an assistant professor. He was promoted to associate professor in 2020, and then to the full professor in 2023. His research field is theoretical condensed matter physics with a focus on many aspects of magnetism, including topological magnetism, quantum transport, and functional magnetic materials. Prof. Zang was recipient of IUPAP Young Scientist Prize in the field of magnetism and the Alexander von Humboldt Fellowship for Experienced Researchers. He is currently the chair of the APS New England Section.
Mar. 18, 2025
C.-J. David Lin
National Yang Ming Chiao Tung University
Parton physics from lattice gauge theory: past, present and future
Host: Chia-Hsien Shen
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Understanding hadron structure and relevant aspects of quantum chromodynamics is one of the key topics in contemporary physics. Given the non-perturbative nature of such problems, lattice gauge theory is the most reliable tool for making progress. However, conventional lattice calculations are normally performed in Euclidean space, making it challenging to access light-cone dynamics that is crucial for parton physics. In this talk, I will briefly introduce this subject, and give an overview of current lattice methods for tackling this issue. Furthermore, a tensor-network approach will be discussed. This approach allows for direct lattice computations in Minkowski space and is applicable for future calculations carried out on quantum computers. I will show our numerical results of meson parton distribution functions in the Schwinger model from this tensor-network method.
Brief Bio
C.-J. David Lin received his PhD degree from the University of Edinburgh in January 1999. He held postdoctoral positions at the University of Kentucky (February to September 1999), the University of Southampton (October 1999 to August 2003) and the University of Washington in Seattle (September 2003 to August 2006), as well as a visiting scholarship at the University of Cambridge (October 2006 to January 2007), before joining the faculty of National Chiao-Tung University (now National Yang Ming Chiao Tung University) in February 2007. As a lattice field theorist, his research interests span a wide variety of topics in particle and nuclear physics, including composite Higgs model, two-Higgs doublet model, hadron structure, flavour physics, and lower-dimensional quantum field theories.
Mar. 25, 2025
Wei-Li Lee
AS Institute of Physics
Charge transport signatures in topological phases of matter
Host: Cheng-Tien Chiang
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Topological phases of matter are an emerging and intriguing field, exhibiting remarkable new physical phases and quantum phenomena. In a topological system, nontrivial bulk band topology is accompanied by the presence of unusual surface states, forming a special bulk-surface correspondence. Several surface-sensitive tools have been utilized with great success to reveal these unusual surface states in various topological systems. However, the experimental demonstration of distinct charge transport signatures for surface states in topological systems remains a grand challenge due to the overwhelming contributions from bulk and impurity states, which is particularly detrimental to topological nodal systems.
In this presentation, we will review our experimental efforts in demonstrating charge transport signatures in several topological systems. The first is the quantum anomalous Hall effect in a magnetic topological insulator, which arises from unique chiral edge modes. The second system is the observation of unique Weyl-orbit quantum oscillations in Weyl metal SrRuO₃ thin films, originating from Fermi-arc surface states. Finally, I will briefly present our recent observations of nonlinear and nonreciprocal transport effects in Weyl metal SrRuO₃ thin films, supporting for the existence of the Berry curvature dipole and zero-energy chiral edge modes in a topological Weyl semimetal. These results were made possible only in thin films with ultra-low defect levels, grown using the molecular beam epitaxy technique. The demonstration of charge transport signatures forms an important foundation for future quantum technologies based on topological phases of matter.
Brief Bio
Dr. Wei-Li Lee is a research fellow at the Institute of Physics, Academia Sinica. Dr. Lee received his Ph.D. from Princeton University in 2005. After that, he joined Johns Hopkins University as a postdoctoral researcher until 2006. In 2007, he became a faculty member at the Institute of Physics, Academia Sinica. His research focus is on the charge and thermal transport properties in quantum materials, including complex oxides and their interface, strongly correlated electronics systems, topological systems, graphene-based electronics and 2D materials and devices, etc.
Apr. 01, 2025
Wolfgang Kuch
Freie Universität Berlin
Ultrafast magnetization dynamics in antiferromagnet / ferromagnet layered systems
Host: Ting-Wen Lan
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Antiferromagnetic films have certain advantages over ferromagnetic ones such as the absence of stray fields and a faster magnetization dynamics. They also allow to tune the magnetic properties of adjacent ferromagnetic films, clusters, or adatoms. While the static interaction between ferromagnetic and antiferromagnetic layers has been thoroughly studied in many systems in the past, the dynamic response of ferromagnetic/antiferromagnetic layered systems is lacking investigation, mainly due to the difficulty to detect antiferromagnetic spin order on short timescales.
Taking advantage of magnetic circular and linear dichroisms in resonant reflectivity of soft x rays is an invaluable tool for probing the magnetic response of untransparent ferromagnetic/antiferromagnetic bilayers. By combining ultrashort soft-x-ray probe pulses with near-infrared pump pulses in a pump–probe experiment allows to follow the ultrafast magnetic response of such systems in an element-resolved way.
Using this method, we observe that the presence of antiferromagnetic order in NiMn layers speeds up the demagnetization of an adjacent metallic ferromagnetic layer, which is attributed to bidirectional laser-induced superdiffusive spin currents between the ferromagnetic and the antiferromagnetic layers [1]. The elemental resolution of the method allows to separately detect the ultrafast response of antiferromagnetic Mn and ferromagnetic Co in [Mn/Co] multilayers, where optically induced intersite spin transfer between Co and Mn layers leads to an ultrashort transient magnetization in the elemental antiferromagnet Mn [2]. The ultrafast reduction of magnetic linear dichroism from antiferromagnetic CoO in Fe/CoO bilayers can be compared to the one in magnetic circular dichroism of the ferromagnetic Fe layer. In both layers, the magnetic order is quenched in less than 200 fs upon laser excitation [3]. To our knowledge, this is the first experiment directly detecting the time-resolved evolution of antiferromagnetic order by magnetic linear dichroism in the soft-x-ray regime.
Work done in collaboration with C. S. Awsaf, E. Golias, I. Kumberg, S. Thakur, J. Gördes, C. Schüßler-Langeheine, N. Pontius, P. M. Oppeneer, M. Weißenhofer, S. Sharma, J. K. Dewhurst, I. Gelen, R. Hosseinifar, Q. Guillet, K. Frischmuth, T. Shinwari, M. Walter.
[1] I. Kumberg et al., Phys. Rev. B 102, 214418 (2020).
[2] E. Golias et al., Phys. Rev. Lett. 126, 107202 (2021).
[3] C. S. Awsaf et al., arXiv:2408.14360 (2024).
Brief Bio
Wolfgang Kuch has been a full professor at Freie Universität Berlin (Germany) since 2004. He received his diploma degree in 1989 from the Goethe-Universität Frankfurt (Germany) and his Ph.D. degree from Universität Stuttgart (Germany) in 1993. Before joining Freie Universität Berlin, he was a staff scientist at the Max-Planck-Institut for Microstructure Physics in Halle (Germany). His research interest is on magnetic films, surfaces, and adsorbed molecules, including the dynamic behavior on ultrashort time scales.
Apr. 08, 2025
Midterm exam
Apr. 15, 2025
Ting-Wan Chen
National Central University
Rapid Follow-up of Extreme Transients from Lulin Observatory
Host: Ting-Wen Lan
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Taiwan’s geographic location provides a unique longitudinal advantage for time-domain astronomy, enabling coverage of critical time windows in global transient monitoring networks. Leveraging the flexibility of small-aperture telescopes, the 40 cm and 1 m telescopes at Lulin Observatory are routinely used for real-time follow-up of rapidly evolving transients, including kilonovae, fast blue optical transients (FBOTs), fast X-ray transients, gamma-ray bursts, and young supernovae. These efforts have resulted in the identification of multiple optical counterparts, particularly in response to Einstein Probe alerts, which are promptly reported to the community. The team is also actively involved in the ePESSTO+ and ZTF collaborations, and works with the ATLAS survey to capture the earliest phases of supernova explosions. Through the engagement of citizen scientists, the project aims to maximize the scientific return of these facilities and contribute meaningfully to the study of extreme transients.
Brief Bio
Prof. Ting-Wan Chen received her PhD in 2015 from Queen’s University Belfast, UK. She has held research positions in Germany, including at the University of Bonn, the Max Planck Institute for Extraterrestrial Physics, and the Technical University of Munich. She was awarded both the Humboldt Research Fellowship and the Marie Skłodowska-Curie Fellowship to support her postdoctoral work in Germany and Stockholm University, Sweden. Her research focuses on supernovae, transient phenomena, and time-domain astronomy. She is currently an Assistant Professor at the Graduate Institute of Astronomy, National Central University, Taiwan. She is also a recipient of the Yushan Young Fellowship from Taiwan’s Ministry of Education.
Apr. 22, 2025
Chia-Min Chung
National Sun Yat-sen University
Computational study on 2D Hubbard model
Host: Chang-Tse Hsieh
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
The Hubbard model is an iconic model in quantum many-body physics and has been intensely studied, especially since the discovery of high-temperature cuprate superconductors. Thanks to the development of computational methods, highly accurate simulations of correlated electron systems have become possible. In this talk, I will introduce recent progress in computational studies of the 2D Hubbard model, which exhibits interesting phases and competing orders, such as charge and spin density waves appearing in so-called stripe states, coexisting or competing with superconducting order. I will also discuss our recent work, where we found superconductivity in both the electron- and hole-doped regimes, along with the coexistence of superconductivity and partially filled stripes in the Hubbard model.
Brief Bio
Chia-Min Chung is an assistant professor at National Sun Yat-sen University in Taiwan. He received his Ph.D. from National Tsing Hua University in 2014. After that, he held postdoctoral positions at several institutes, including the University of California, Irvine (2014–2017), Ludwig Maximilian University of Munich (2017–2019), and the University of Copenhagen (2020–2021), before joining the faculty at National Sun Yat-sen University. Prof. Chung's research interests lie in using computational methods, such as tensor network and quantum Monte Carlo techniques, to study low-temperature phenomena in quantum many-body systems. He is also interested in developing new computational algorithms for these simulations.
Apr. 29, 2025
Yuan-Ron Ma
National Dong Hwa University
Bilayer Quantum Computer and Other Applications of 2D Layered Materials
Host: Cheng-Tien Chiang
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Recently two-dimensional (2D) layered materials have attracted many attentions, because they can be easily and precisely exfoliated to be only a monolayer or few layers due to the weak van der Waal forces between the stacked layers. In fact, the unique and special properties of the monolayer and few layers have facilitated the rapid development of electronics and spintronics based on monolayer, bilayer, few-layer and so on. Our laboratory at National Dong Hwa University (NDHU), Taiwan has synthesized more than ten 2D layered materials, such as CrI3, VI3, GaTe, SnS2, Bi2S3, NiPS3, and so on, and some interesting results have been already published. We use the energy-resolved magnetic circular dichroism (MCD) spectropolarimetry possessing the excellent capability to detect the magneto-optical characteristics of d-d transitions and spin behaviors in applied magnetic fields. The MCD spectra provide a specific signals of two-qubit (2Q) quantum states (≡|ѱѱ>) of |01> and |10> from a 2D bilayer CrI3 for quantum information. A 2D monolayer CrI3 possessing the ferromagnetic (FM) nature of out-of-plane Ising spin-up (or spin-down) electrons can be considered as a qubit with a quantum state of |ѱ>=|↑>=|0> (or |ѱ> =|↓>=|1>) due to the theory of the Bloch sphere. Hence, an FM or antiferromagnetic (AFM) bilayer CrI3 can be reflected two qubits for quantum information or quantum computer.
Brief Bio
Yuan-Ron Ma is a distinguished professor in the Department of Physics at the National Dong Hua University (NDHU). He received his doctoral degree in physics in 1998 from the University of Nottingham. After a short postdoctoral research period at the Academia Sinica, he joined the NDHU as an assistant professor in 1999 in the Department of Physics. Later on he became the associate and then the full professor, as well as the chair of the same department. In 2021 Prof. Ma has been appointed as the distinguished professor at the NDHU, and recently as vice president for his secondment at the Fo Guang University, accompanied with positions as the Dean of the College of Creativity and Technology as well as the chair professorship in the Department of Applied Informatics there. In addition to his extensive university faculty experience, Prof. Ma has been actively participating in academic service, including several committees of the Ministry of Science and Technology as well as the Physical Society of the Republic of China. His research has focused on surface science and technology, with recent applications of 2D materials and oxide heterostructures.
May 06, 2025
Lluis Mas Ribas
UC Santa Cruz
Radiative AGN feedback constraints from line-locked CIV winds in quasar spectra
Host: Ting-Wen Lan
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
Active galactic nuclei (AGN) feedback plays a fundamental role in regulating the evolution of galaxies, but the main driving processes and their contributions are still uncertain. We use SDSS/BOSS DR16 quasar spectra containing absorption features from CIV in quasar outflows to investigate the presence of the radiation-pressure signature dubbed line-locking, and to infer wind properties from stacked samples. We design software that will be publicly available to create mock CIV absorption troughs from quasar winds based on real spectra, and use it to confirm that the line-locking features observed in our outflow composite spectra are physical and not a product of line contamination or systematics. By making use of the composite mocks and real spectra, we then infer parameters characterizing the wind and the radiative power; assuming typical average outflow covering fractions above ~85%, we find a CIV line ratio > 1.5 and N_CIV ~1e14 cm-2, consistent with other literature results, and line locking to be present in over 50% of the absorption troughs in any case. Finally, we estimate that radiative pressure does play a major role in accelerating the winds, via the absorption of about 1% of the total quasar luminosity.
Brief Bio
Dr. Lluis Mas Ribas is a project scientist at the University of California, Santa Cruz (UCSC). He received his master’s degree in particle physics from the University of Barcelona (Spain) and obtained his Ph.D. in astrophysics from the University of Oslo (Norway). He then worked as a postdoctoral researcher at Caltech and NASA/JPL (USA). Before joining UCSC, he worked in the industry of machine learning. His research covers a range of topics, including the origins of neutral gas in the Universe, how quasars drive galaxy evolution, and the use of emission lines to probe the Universe.
May 13, 2025
Wen-Bin Jian
National Yang Ming Chiao Tung University
Instrumentation and experimental measurements of thermopower and carriers’ effective mass of few-layer two-dimensional materials – MoS2 as an example
Host: Shao-Yu Chen
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
The ultrathin two-dimensional semiconductor of MoS2 demonstrates prominent field-effect performances for down-sizing transistors. Electron transport and thermoelectric properties have only been investigated in few-layer MoS2 at low temperatures. The interrelation between electrical and thermoelectric properties has not been studied yet. Here, thermoelectric field-effect transistor devices are fabricated using MoS2 flakes with thicknesses ranging from 1 to 39 layers. Electrical and thermoelectric properties are measured at temperatures ranging from 80 to 600 K and analyzed by Mott’s hopping transport, thermal activation, and phonon scattering theories. The carrier concentration dependences are investigated using hopping transport and enhanced phonon scattering theories. With fittings to theoretical models, we experimentally obtained the universal constant and the electron’s effective mass. Seebeck coefficients, conductivities, and power factors are sketched as a function of the MoS2 flake thickness, pointing to higher Seebeck coefficients and power factors at thicknesses less than 20 layers, exhibiting the best candidate for thermopower applications among all two-dimensional semiconductors. Additionally, we probe the extrinsic effect of memory steps due to trapped charges releasing at temperatures above 450K in the modulation of electrical and thermoelectric properties, playing an important role in applying to high-temperature thermometers.
Brief Bio
Dr. Wen-Bin Jian got his PhD degree in Physics from National Taiwan University, Taiwan in 2002. He afterward took the postdoctoral researcher position in Academia Sinica (Taiwan) for 6 months and went to the US for the postdoctoral position in Advanced Materials Research Institute, University of New Orleans (New Orleans USA). After another 6-month postdoctoral experience in the US, he came back to Taiwan and joined the Department of Physics, National Chung Hsing University, as an assistant professor, starting in August 2003. In August 2004, he relocated to Hsinchu and joined the Department of Electrophysics, National Chiao Tung University (NCTU). Dr. Jian got promoted to be a full professor in August 2011.
Dr. Jian’s research interests include electron transport, field-effect transport, and thermoelectric transport of electrons in low-dimensional systems including zero-dimensional (0D) quantum dots, one-dimensional nanowires (1D), and two-dimensional (2D) nanosheets (2D materials). He currently focuses on 2D materials including graphene, MoS2, black phosphorous, WSe2, ReSe2, and TaS2.
May 20, 2025
Titash Mondal
Rubber Technology Centre
[CANCELED]
Host:
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
May 27, 2025
Sut-Ieng Tam
National Yang Ming Chiao Tung University
Using Gravitational Lensing to Study Dark Matter & Cosmology
Host: Ting-Wen Lan
Time: 2:20 pm
Place: Room 104, CCMS-New Phys. building
Abstract
In the standard cosmological model, the matter content of the Universe is dominated by dark matter—an invisible component that governs the formation and evolution of cosmic structures. While dark matter cannot be observed directly, its gravitational influence can be detected through the deflection of light from background sources, a phenomenon known as gravitational lensing.
In the first part of this talk, I will introduce the gravitational lensing effect in galaxy clusters and explain how it serves as a powerful probe for detecting dark matter and constraining its physical properties. In the second part, I will present a novel simulation-based inference framework for cluster cosmology. By integrating machine learning with forward modeling of weak lensing observables, this approach bypasses traditional likelihood-based methods and enables robust inference of cosmological parameters.
Brief Bio
Prof. Sut-Ieng Tam is a faculty member at the Institute of Physics, National Yang Ming Chiao Tung University. She received her Ph.D. in 2020 from Durham University, UK. Before joining NYCU in 2024, she worked as a postdoctoral researcher at Academic Sinica, Institute of Astronomy and Astrophysics. Prof. Tam’s research focuses on combining observational datasets and statistical methods to explore the nature of dark matter and the cosmological parameters of the Universe.
Joint Colloquia