Seminar/Colloquium Archive

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Alexander Kusenko (UCLA / Kavli IPMU)
Title:	Direct detection of dark matter in the form of primordial black holes
Date:	Tue, Sep 08, 2026, 15:30 - 16:30
Place:	Lecture Hall

MS Seminar (Mathematics - String Theory)

Speaker:	Motohico Mulase (University of California at Davis)
Title:	Gaiotto's Conformal Limit and the Geometric Langlands Correspondence
Date:	Tue, Sep 08, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Alexander Kuznetsov (Steklov Mathematical Institute, Russian Academy of Sciences)
Title:	T-structures on semiorthogonal components
Date:	Mon, Sep 07, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Mathieu Lamoureux (Laboratoire AstroParticule & Cosmologie, Université Paris Cité)
Title:	Neutrinos from the Deep: latest KM3NeT results
Date:	Fri, Aug 28, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Toshifumi Futamase (Tohoku University)
Title:	Possible interpretation of DESI BAO result
Date:	Thu, Aug 27, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Luis Padilla (Rikkyo University)
Title:	Primordial Black Hole Formation during Kination: Critical Behaviour and Mass Functions
Date:	Thu, Aug 20, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Astro Seminar)

Speaker:	Kai Wang (Durham University)
Title:	From inflow-driven to equilibrium: how the baryon cycle shapes the metallicity of galaxies across cosmic time
Date:	Mon, Aug 17, 2026, 15:30 - 17:00
Place:	Seminar Room A
Remarks:	The speaker will not be visiting Kavli IPMU in person and will deliver the talk remotely. Audience members may attend the talk in Seminar Room A or join online.

Special Seminar (Special Seminar)

Speaker:	Anupreeta More (IUCAA)
Title:	Multi-messenger with gravitational lensing
Date:	Fri, Aug 07, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Christopher Storfer
Title:	From Discovery to Science: An End-to-End Pipeline for Analyzing Strong Gravitational Lenses
Date:	Thu, Aug 06, 2026, 11:00 - 12:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Chris Storfer (U Hawaii) (H Hawaii)
Title:	From Discovery to Science: An End-to-End Pipeline for Analyzing Strong Gravitational Lenses
Date:	Thu, Aug 06, 2026, 11:00 - 12:00
Place:	Seminar Room A

IPMU Colloquium

Speaker:	Cliff Burgess (Perimeter Institute)
Title:	The Gravity of Tinkering with Einstein
Date:	Wed, Aug 05, 2026, 15:30 - 17:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Kai Schmitz (U. Munster)
Title:	News from the Pulsar Timing Array Frontier
Date:	Wed, Aug 05, 2026, 13:30 - 14:30
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Andrew Tolley (Imperial College London)
Title:	Schwinger-Keldysh Path Integral for Gauge Theories
Date:	Tue, Aug 04, 2026, 13:30 - 14:30
Place:	Lecture Hall

MS Seminar (Mathematics - String Theory)

Speaker:	Minkyoo Kim (Seoul National University)
Title:	UV completion of 2D Ising CFT: a golden E8 massless S-matrix
Date:	Tue, Aug 04, 2026, 13:30 - 15:00
Place:	Seminar Room A
Related File:	3625.pdf

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Jason Twamley (OIST)
Title:	Engineering quantum motion using magnetic forces for quantum sensing and exploring quantum gravity using table-top experiments.
Date:	Tue, Jul 28, 2026, 15:30 - 17:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Encieh Erfani (Perimeter Institute)
Title:	Primordial Black Holes: Gravitational-Wave Signatures
Date:	Tue, Jul 28, 2026, 13:30 - 15:00
Place:	Seminar Room B

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Stefan Ritt (Paul Scherrer Institute)
Title:	Picosecond Timing for Particle Physics: Design Principles and Lessons Learned from the MEG II Experiment
Date:	Mon, Jul 27, 2026, 13:30 - 15:00
Place:	Seminar Room A
Remarks:	Passcode 747197

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Adil Jueid　 (KIAS)
Title:	Top quark FCNC decays at the LHC: Progress with Machine Learning
Date:	Fri, Jul 24, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Laurence Perreault Levasseur and Yashar Hezaveh (U Montreal)
Title:	Data-Driven High-Dimensional Inverse Problems: A Journey Through Strong Gravitational Lensing Data Analysis
Date:	Thu, Jul 23, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Astro Seminar)

Speaker:	Akash Vani (Max Planck Institute for Astrophysics)
Title:	Grow fast, die young: The early universe’s galaxy formation recipe
Date:	Tue, Jul 14, 2026, 11:00 - 12:00
Place:	Seminar Room A

IPMU Colloquium

Speaker:	Kentaro Nakamura (UTokyo)
Title:	REE-rich mud as an important key for sustainable development of our society
Date:	Wed, Jul 08, 2026, 15:30 - 17:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Diederik Roest (University of Groningen)
Title:	Multi-field Inflation with spectator Axions
Date:	Tue, Jul 07, 2026, 15:30 - 17:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Kendric Schefers (UC Berkeley)
Title:	Coherent sheaves, matrix factorizations, and the microlocalization of homology
Date:	Tue, Jul 07, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Takumi Yada (University of Jyväskylä)
Title:	Masculinity in the Public Image of IT: A New Model Integrating Social Dimensions in Japan
Date:	Mon, Jul 06, 2026, 14:00 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Keisuke Harigaya (U Chicago)
Title:	A solution to the strong CP problem from mirror QCD and chiral U(1)
Date:	Wed, Jul 01, 2026, 13:30 - 15:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Vincent Lee (UC Berkeley)
Title:	Direct Gravitational Detection of Dark Matter
Date:	Thu, Jun 25, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Shengjing Xu (UPenn) (University of Pennsylvania)
Title:	Holomorphic Lagrangians in Higgs and de Rham Moduli Spaces
Date:	Thu, Jun 25, 2026, 13:30 - 15:00
Place:	Seminar Room B

Special Seminar (Special Seminar)

Speaker:	Mario Ballardini (University of Ferrara)
Title:	Status and future of primordial features: from the CMB to non-linear scales
Date:	Wed, Jun 24, 2026, 13:30 - 15:00
Place:	Seminar Room A
Remarks:	Mario is a cosmologist interested in different areas at the interface of theory, phenomenology, and data analysis. Data-wise his primary focus is on Cosmic Microwave Background (CMB) and large-scale structure (LSS) data. In particular, he is interested in how combinations and cross-correlations between CMB and LSS can fully bring into play the synergy between these two probes. He studies the phenomenology of cosmic inflation, primordial features, and scalar-tensor modified gravity theories through the use of precision cosmological and astrophysical data. Mario has been core-team member of the Planck Collaboration and member of the CORE Collaboration. Currently, he is a member of the Euclid Collaboration, in particular of the working group on cross-correlations between cosmic microwave background anisotropies and large-scale structure surveys and of the theory working group. He is also a member of the LiteBIRD Collaboration contributing to the studies for cosmic inflation.

MS Seminar (Mathematics - String Theory)

Speaker:	Yan-Lung Leon Li (IBS Postech)
Title:	Seidel representations and obstructions of Lagrangian correspondences
Date:	Fri, Jun 19, 2026, 13:30 - 15:00
Place:	Seminar Room B

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Kingman Cheung (National Tsing Hua U. (Taiwan))
Title:	Probing Dark Photon via Primordial Black Holes Hawking Radiation
Date:	Fri, Jun 19, 2026, 13:00 - 14:30
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Wei-Hsiang Shao (RIKEN)
Title:	Does Hawking Radiation Survive Beyond the Scrambling Time?
Date:	Thu, Jun 18, 2026, 13:30 - 15:00
Place:	Seminar Room A

IPMU Colloquium

Speaker:	Satoru Iwata (UTokyo & Hokkaido Univ.)
Title:	Mathematical Approach to Chemical Reaction Design and Discovery
Date:	Wed, Jun 17, 2026, 15:30 - 17:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Ayuki Kamada (University of Warsaw)
Title:	Self-interacting dark matter: non-perturbative dynamics
Date:	Wed, Jun 17, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Andrey Smirnov (University of North Carolina at Chapel Hill)
Title:	p-adic Quantum Differential Equations and Coulomb Branches
Date:	Tue, Jun 16, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Yutaro Kaijima (The University of Osaka)
Title:	Algorithmic aspects of F-blowups for toric varieties
Date:	Thu, Jun 11, 2026, 15:30 - 17:00
Place:	Seminar Room B

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Haruki Ebina (UC Berkeley)
Title:	The Marked Power Spectrum as a Practical Bispectrum Measure
Date:	Thu, Jun 11, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Yutaro Hiroi (The University of Osaka)
Title:	Quotients by (p-1)/p-klt Foliations on Surfaces
Date:	Thu, Jun 11, 2026, 13:30 - 15:00
Place:	Seminar Room B

IPMU Colloquium

Speaker:	Masahiro Kawasaki (Kavli IPMU)
Title:	Q-ball Cosmology
Date:	Wed, Jun 10, 2026, 15:30 - 17:00
Place:	Lecture Hall
Remarks:	Rescheduled from June 3 to June 10 due to the approaching typhoon.

MS Seminar (Mathematics - String Theory)

Speaker:	Shiraz Minwalla (Tata Institute for Fundamental Research)
Title:	Semi Universality of CFT spectra at large spin
Date:	Tue, Jun 09, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Yusuke Mikura (ASIAA)
Title:	Imprints of gravitational-wave polarizations on projected tidal tensor in three dimensions
Date:	Thu, Jun 04, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Astro Seminar)

Speaker:	Kana Moriwaki (UTokyo)
Title:	CosmoGLINT: Cosmological Generative Model for Line Intensity Mapping with Transformer
Date:	Tue, Jun 02, 2026, 11:00 - 12:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Yuri Nakao (Fujitsu Limited, Fujitsu Research, Security Science Laboratory)
Title:	Development and Practice of a Research and Development Process Based on the Concept of “Responsible Research and Innovation”: A Case Study on a Web Search System that Reflects People’s Values
Date:	Wed, May 27, 2026, 14:00 - 16:00
Place:	Seminar Room B

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Marianne Moore (MIT)
Title:	Concurrent production of dark matter and baryons in the Early Universe
Date:	Fri, May 22, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Jorge Alda (INFN Padova)
Title:	GeV ALP interactions with hadrons
Date:	Wed, May 20, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Evgeny Shinder (U of Sheffield)
Title:	Canonical semiorthogonal decompositions for G-surfaces
Date:	Wed, May 20, 2026, 13:30 - 15:00
Place:	Seminar Room B

Special Seminar (GTM Seminar)

Speaker:	Tony Yau
Title:	Brane quantization and SYZ mirror symmetry
Date:	Thu, May 14, 2026, 15:30 - 17:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Chervin Laporte (Observatoire de Paris-Meudon)
Title:	Early phases of Milky Way formation as told by field stars and globular clusters
Date:	Tue, May 12, 2026, 15:30 - 17:00
Place:	Seminar Room A

Special Seminar (Astro Seminar)

Speaker:	Ashley Hai Tung Tan, Neelesh Amrutha and Zachary Steyn (Australian National Univ.)
Title:	Three collaborative talks (Please see each title in the abstract)
Date:	Tue, May 12, 2026, 11:00 - 12:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Chris Brav (SIMIS)
Title:	Noncommutative geometry at infinity
Date:	Thu, May 07, 2026, 13:30 - 15:00
Place:	Seminar Room B

Special Seminar (GTM Seminar)

Speaker:	Yi Zhang (Kavli IPMU)
Title:	Geometrization of BV quantisation of gerbe connection, higher Russian formula and anomalies
Date:	Thu, Apr 30, 2026, 15:30 - 17:00
Place:	Seminar Room B

MS Seminar (Mathematics - String Theory)

Speaker:	David Klompenhouwer (University of Padova)
Title:	Meromorphic differentials, spin structures, and the BKP hierarchy
Date:	Tue, Apr 28, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (CD3 Seminar)

Speaker:	Jiamin Hou (LMU Munich)
Title:	Unveiling New Physics with Galaxy Surveys in the Data-driven Era
Date:	Mon, Apr 27, 2026, 11:00 - 12:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Robert Brandenberger (McGill University)
Title:	TBA
Date:	Thu, Apr 23, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (CD3 Seminar)

Speaker:	Daniela Galárraga-Espinosa (Kavli IPMU)
Title:	Bridging galaxy formation and cosmology with multi-scale filaments
Date:	Wed, Apr 22, 2026, 11:00 - 12:00
Place:	Lecture Hall

MS Seminar (Mathematics - String Theory)

Speaker:	Xiaohan Yan (Toulouse Mathematics Institute)
Title:	K-Theoretic Gromov-Witten Invariants and q-Difference Equations
Date:	Tue, Apr 21, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Rubén Comas Forgas (Balearic Islands University)
Title:	Beyond the Promise of AI: Ethics, Transparency and Academic Integrity in Scholarly Communication
Date:	Mon, Apr 20, 2026, 14:00 - 15:00
Place:	Seminar Room A

Special Seminar (CD3 Seminar)

Speaker:	Marta Monelli (Kavli IPMU)
Title:	Probing fundamental physics with CMB polarization and beyond
Date:	Mon, Apr 20, 2026, 11:00 - 12:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	David Fonseca Mota (University of Oslo)
Title:	Cosmological Tests of Gravity Beyond General Relativity
Date:	Thu, Apr 16, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (CD3 Seminar)

Speaker:	William DeRocco (University of Maryland)
Title:	Microlensing in the Roman Era
Date:	Thu, Apr 16, 2026, 11:00 - 12:00
Place:	Lecture Hall

IPMU Colloquium

Speaker:	Giovanna Tinetti (King's College London)
Title:	New worlds in our galaxy: the planets around other stars
Date:	Wed, Apr 15, 2026, 15:30 - 17:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Benedetta Ciardi (Max Planck Institute for Astrophysics)
Title:	Modeling and observations of cosmic reionization 
Date:	Wed, Apr 15, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Deshuo Liu (Imperial College of London)
Title:	Interplay between Generalised Symmetries and Moduli Spaces of 3d N>=4 theories
Date:	Wed, Apr 15, 2026, 13:30 - 15:00
Place:	Seminar Room B
Related File:	3536.pdf

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Jasper Roosmale Nepveu (NTU national taiwan university)
Title:	Operator spectra of general EFTs and many CFTs
Date:	Wed, Apr 15, 2026, 11:00 - 12:00
Place:	Seminar Room A
Remarks:	TIME CHANGED

Special Seminar (fundamentals seminar)

Speaker:	Masahito Yamazaki (Kavli IPMU/ UTokyo )
Title:	Quantum Algorithms
Date:	Tue, Apr 14, 2026, 15:30 - 17:00
Place:	Seminar Room B
Remarks:	It is only in person.

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Lorenzo Roberti (Southern National Laboratory, Italy)
Title:	The role of massive stars in Galactic and cosmological chemical enrichment from the cosmic dawn
Date:	Tue, Apr 14, 2026, 15:30 - 17:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Dam Son (University of Chicago)
Title:	Near-conformal nuclear physics
Date:	Mon, Apr 13, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Haowen Zhang (Canadian Institute for Theoretical Astrophysics)
Title:	Trinity: the Dark Matter Halo—Galaxy—Supermassive Black Hole (SMBH) Connection from z=0-10
Date:	Thu, Apr 09, 2026, 13:30 - 15:00
Place:	Seminar Room A

IPMU Colloquium

Speaker:	Jia Liu (Kavli IPMU)
Title:	Our Universe in Simulation
Date:	Wed, Apr 08, 2026, 15:30 - 17:00
Place:	Lecture Hall

MS Seminar (Mathematics - String Theory)

Speaker:	Adar Sharon (UCLA)
Title:	Constraining CFTs with moduli spaces
Date:	Tue, Apr 07, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Henrique Rubira (Cambridge/LMU)
Title:	Novel results in perturbation theory for LSS
Date:	Fri, Apr 03, 2026, 15:30 - 17:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Ben Davison (University of Edinburgh)
Title:	BPS cohomology of (0)-shifted symplectic stacks (4th talk in the four-lecture series)
Date:	Thu, Apr 02, 2026, 13:30 - 15:00
Place:	Seminar Room B

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Ruth Gregory (KCL)
Title:	(Ultra) Slow Roll with a Black Hole
Date:	Thu, Apr 02, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Ben Davison (University of Edinburgh)
Title:	BPS cohomology of (0)-shifted symplectic stacks (3rd talk in a four-lecture series)
Date:	Wed, Apr 01, 2026, 13:30 - 15:00
Place:	Seminar Room B

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Serguey T. Petcov (INFN/SISSA)
Title:	Modular-Symmetry-Protected Seesaw Mechanism
Date:	Wed, Apr 01, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	David Sanders (Univ. of Hawaii, Institute of Astronomy)
Title:	The Origin and Evolution of Luminous AGN: recent progress and future challenges
Date:	Tue, Mar 31, 2026, 15:30 - 17:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Jinglong Liu (Shanghai Jiao Tong U)
Title:	Fermion condensate inflation with waterfall mechanism
Date:	Tue, Mar 31, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Astro Seminar)

Speaker:	Gary J Hill (University of Texas at Austin) and Maximilian Fabricius (MPE)
Title:	The Hobby-Eberly Telescope VIRUS Deep Fields Initiative – tracing Ly-alpha emission from the cosmic web at z=2-3
Date:	Tue, Mar 31, 2026, 11:00 - 12:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Ben Davison (University of Edinburgh)
Title:	BPS cohomology of (0)-shifted symplectic stacks (2nd talk in a four-lecture series)
Date:	Mon, Mar 30, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Nathalie Korhonen Cuestas (NorthWestern University)
Title:	Metallicity Scaling Relations at Cosmic (after)Noon
Date:	Mon, Mar 30, 2026, 11:00 - 12:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Ben Davison (University of Edinburgh)
Title:	BPS cohomology in geometry and representation theory 1 (introductory talk in a four-lecture series)
Date:	Thu, Mar 26, 2026, 15:30 - 17:00
Place:	Seminar Room A
Remarks:	This seminar serves as the introductory talk in a four-lecture series on the same topic. Prof. Ben Davison will give three additional lectures at 13:30 on BPS cohomology of (0)-shifted symplectic stacks at the following venues. Seminar Room A on March 30 (Mon) Seminar Room B on April 1 (Wed) Seminar Room B on April 2 (Thu) In this series of talks I will focus on the theory of cohomological BPS invariants for (0)-shifted symplectic stacks. Although this represents only one of the three options above, there are highly developed applications in geometry, representation theory, and nonabelian Hodge theory, and I will be very happy to take input on which of these directions I should lean towards this second week. Stacks of objects in 2-Calabi-Yau categories are a rich source of (0)-shifted symplectic stacks. The Borel-Moore homology of such stacks carry a cohomological Hall algebra (CoHA) product, and the resulting algebras can be often be described in terms of intersection cohomology of coarse moduli spaces. I will review this theory for Nakajima quiver varieties, where this CoHA can be fairly explicitly described in terms of Borcherds algebras. This leads naturally to a comparison result with the Maulik-Okounkov Yangian, defined in terms of (cohomological) stable envelopes. Focusing more on general theory, there is now (due to joint work with Bu, Ibañéz-Nuñéz, Kinjo and Padurariu) a more general theory of BPS cohomology for (0)-shifted symplectic stacks admitting a good moduli space. This provides the required language for talking about topological mirror symmetry and nonabelian Hodge theory for stacks outside of type A, for example. Finally, BPS cohomology provides the framework for proving cohomological chi-independence type conjectures for enumerative invariants of K3 surfaces. A precise version of this conjecture states that the Gopakumar-Vafa invariants of moduli spaces of 1-dimensional coherent sheaves with primitive Mukai vector on K3 surfaces defined in work of Maulik and Toda, and for generally in further work of Toda, do not depend on the Euler characteristic of the sheaves under consideration. This work requires us to step beyond considering BPS cohomology for fixed abelian categories possessing good moduli spaces, and also provides the natural generalisation of Markman's theorem on tautological generation of the cohomology of moduli spaces of semistable coherent sheaves for primitive Mukai vector.

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Sunil Simha (NorthWestern/UChicago)
Title:	FRBs as foreground probes: Recent results from the CHIME collaboration and ongoing work with FLIMFLAM
Date:	Thu, Mar 26, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (fundamentals seminar)

Speaker:	Luca Marchetti (Kavli IPMU)
Title:	Background Independence: What Is Observable in Gravity, and How Do We Quantize It?
Date:	Wed, Mar 25, 2026, 15:30 - 17:00
Place:	Seminar Room A
Remarks:	It is only in person.

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Sara Bianco (DESY)
Title:	BBN disintegration limits from ν-injections
Date:	Wed, Mar 25, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Astro Seminar)

Speaker:	Géza Csörnyei
Title:	SNe II the rescue: independent determination of the Hubble constant through spectral modeling of Type II supernovae
Date:	Tue, Mar 24, 2026, 11:00 - 12:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Laurent Freidel (Perimeter)
Title:	Quantum Null Ray: "covariant quantization"
Date:	Wed, Mar 18, 2026, 15:30 - 17:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Kimberly Boddy (The University of Texas at Austin)
Title:	Cosmological Constraints on Non-Minimally Coupled Ultralight Dark Matter
Date:	Wed, Mar 18, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Hugo Holland (IAS)
Title:	The separate universe approach and gauge fixing procedures for multifield inflation models.
Date:	Fri, Mar 13, 2026, 15:30 - 17:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Karsten Heeger (Yale Univ.)
Title:	Probing the Nature of Neutrino Mass
Date:	Fri, Mar 13, 2026, 13:30 - 15:00
Place:	Seminar Room A

IPMU Colloquium

Speaker:	Lenka Zdeborová (EPFL)
Title:	Statistical Physics of Learning in the Age of Attention
Date:	Thu, Mar 12, 2026, 15:30 - 17:00
Place:	Lecture Hall

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Subhadeep Sarkar (the Indian Institute of Technology Patna (IIT Patna))
Title:	Hunting Sparticles at the LHC using Machine Learning
Date:	Wed, Mar 11, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	José Matos (University of Porto)
Title:	Effective strings and particles interacting in 3D: the Ising model
Date:	Tue, Mar 10, 2026, 15:30 - 17:00
Place:	Seminar Room A
Related File:	3555.pdf

MS Seminar (Mathematics - String Theory)

Speaker:	Vittorio Larotonda (U Bologna)
Title:	A journey through the non-supersymmetric landscape
Date:	Tue, Mar 10, 2026, 13:30 - 15:00
Place:	Seminar Room A
Related File:	3511.pdf

MS Seminar (Mathematics - String Theory)

Speaker:	Federico Ambrosino (Perimeter Institute)
Title:	Perturbed 2d CFT: flows and conserved charges
Date:	Tue, Mar 10, 2026, 11:00 - 12:00
Place:	Lecture Hall
Related File:	3558.pdf

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Fumiya Sano (Science Tokyo)
Title:	Cosmological Collider as an Interaction Probe: Scale-dependence and Diagrams
Date:	Thu, Mar 05, 2026, 13:30 - 15:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Tianyu Yuan (Eastern Institute of Technology, Ningbo, China)
Title:	Morse theory on symmetric products and quantized nonabelianization
Date:	Tue, Mar 03, 2026, 15:30 - 17:00
Place:	Seminar Room A

MS Seminar (Mathematics - String Theory)

Speaker:	Francesco Sala (University of Pisa)
Title:	Cohomological Hall algebras of 1-dimensional sheaves and Yangians over the Bridgeland's space of stability conditions
Date:	Tue, Mar 03, 2026, 13:30 - 15:00
Place:	Seminar Room A

Special Seminar (Astro seminar)

Speaker:	Pavan Vynathea (CITA)
Title:	Asymmetrical supernovae triggered by the tidal disruption of white dwarfs
Date:	Tue, Mar 03, 2026, 11:00 - 12:00
Place:	Seminar Room A

Special Seminar (Special Seminar)

Speaker:	Masaya Yamamoto (Princeton)
Title:	The Legacy DES Y6 Cosmological Constraints from Weak Lensing and Galaxy Clustering
Date:	Mon, Mar 02, 2026, 13:30 - 15:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Beatriz Tucci (Stanford)
Title:	Revealing the information content of galaxy n-point functions with simulation-based inference
Date:	Fri, Feb 27, 2026, 15:30 - 17:00
Place:	Seminar Room A

APEC Seminar (Astronomy - Particle Physics - Experimental Physics - Cosmology)

Speaker:	Liang Tan (Tsung-Dao Lee Institute)
Title:	Probe Neutrino and light DM with Cosmic Gravitational focusing
Date:	Fri, Feb 27, 2026, 13:30 - 15:00
Place:	Seminar Room A