Symmetries in Quantum Dynamics (Lecture 2) by Sanjay Moudgalya

Program: Generalised symmetries and anomalies in quantum phases of matter

ORGANIZERS: Subhro Bhattacharjee (ICTS-TIFR, India) and Sergej Moroz (Karlstad University, Karlstad, Sweden)

DATE & TIME: 05 January 2026 to 16 January 2026

VENUE: Ramanujan Lecture Hall, ICTS Bengaluru

In recent years, the study of symmetries in quantum many-body systems has undergone a profound transformation. Physicists are uncovering new forms of symmetry—such as higher-form, non-invertible, and subsystem symmetries—that go far beyond traditional notions rooted in particle and condensed matter physics. These generalized symmetries have opened up powerful new ways to understand and classify quantum phases of matter, including many that fall outside conventional paradigms.

At the same time, the concept of anomaly—once mostly associated with high-energy physics—has found new life in condensed matter settings. It now plays a central role in understanding how microscopic symmetries can be realized in highly nontrivial ways at low energies, often protecting or constraining exotic quantum phases such as symmetry-protected topological (SPT) states.

These new insights have reshaped our understanding of quantum entanglement, conservation laws and hydrodynamics in interacting systems, and are beginning to influence how we think about mixed states and open quantum systems.

This meeting aims to bring together a diverse set of researchers working at the forefront of these developments. A key goal of the program is to provide conceptual clarity and technical grounding for early-career researchers through a series of pedagogical lectures, while also promoting cutting-edge research through focused seminars. By fostering dialogue and collaborations within this broad community, we aim to deepen our understanding of how symmetry continues to shape the quantum world in unexpected ways.

Topics to be covered for school:

1. Overview of generalized symmetries, Chern-Simons theories and their application to quantum matter
2. Introduction to anomalies
3. Fractons
4. Categories in condensed matter physics
5. Non-invertible and Higher-form symmetries
6. Defects and symmetries
7. Emergent symmetries, Hilbert space fragmentation and hydrodynamics
8. Symmetries of mixed quantum states
9. Numerical methods for Topological phases

The program is funded by ICAM-I2CAM, U.S. National Science Foundation and supported by the Swedish Foundation for International Coopearion in Research and Higher Education.

CONTACT US: gsaqpm@icts.res.in

PROGRAM LINK: https://icts.res.in/program/gsyqm2026