Koushik Ray
IACS
A retirement symposium
Boss Fest
Celebrating a life in ideas,
mentorship & gravity.
Join colleagues, collaborators, and former students at IIT Kanpur to celebrate the career of our beloved “Boss,” Professor Gautam Sengupta.
22
AugustSaturday · 2026
IIT
Kanpur
Kanpur
01 The celebration
A day for the
Boss.
Some careers are measured in papers. The most meaningful ones are also measured in people—in the questions they inspire, the doors they open, and the conversations that continue long after class.
Boss Fest brings together colleagues, collaborators, and former students for a day of talks, recollections, and warm conversation celebrating Professor Gautam Sengupta’s career and retirement from IIT Kanpur.
Ideas across the boundaryGeometry · Gravity · Quantum Information
02 Invited speakers
Voices from the
journey.
Four invited speakers. One shared celebration of curiosity, community, and a remarkable mentor.
Koushik Ray
CT scan of Minkowski space fields
I shall discuss some preliminary results on reconstruction of fields in the (d+1)-dimensional Minkowski space from conformal fields on a celestial (d-1)-dimensional sphere.
Anurag Sahay
Thermodynamic Geometry of lattice spin models and beyond: some recent investigations and outlook.
In this talk I shall first introduce the program of thermodynamic information geometry in a general setting, with an emphasis on the state space scalar curvature. Then I will describe the method of constrained fluctuations for multiparameter systems and apply it to a few classical lattice spin models in 1D. Furthermore, I will describe the geometry of frustrated chains and make some predictions based on the landscape of curvature. Finally, I will share my perspective on the program.
Vinay Malvimat
L-entropy: A novel measure for probing genuine multipartite entanglement
Multipartite entanglement is considerably richer and more intricate than its bipartite counterpart, with important implications for quantum information, quantum communication and many-body quantum systems. In this talk, I will introduce Latent Entropy (L-entropy), a novel measure of genuine multipartite entanglement with a broad range of applications, including many-body systems, quantum field theories, and holography. Constructed from an upper bound on reflected entropy, L-entropy attains its maximal value, as expected from quantum-information considerations, for GHZ states in three-party systems and for 2-uniform states in n-party systems with n >= 4. I will discuss the key properties of L-entropy and its ability to characterize genuine multipartite entanglement. Finally, I will explore its holographic realization and its potential to reveal the multipartite entanglement structure of CFTs dual to multi-boundary wormholes.
Tapobrata Sarkar
What happens when White Dwarf binaries meet Kerr black holes
When a stellar binary encounters a spinning black hole, interesting phenomena might result due to the mutual interaction between the binary spin, orbital angular momentum and the black hole spin. In this talk, I will consider such an encounter between an intermediate mass spinning black hole and a close identical white dwarf binary system whose center of mass follows a parabolic trajectory. After discussing the physics, I will argue that in such encounters the mass fallback rate into the black hole may show a typical three-hump structure that might be a smoking gun signature of tidal disruption of binaries.
03 Schedule
Saturday
22 August 2026, FB 382
Indian Institute of Technology Kanpur
| 10:00 AM - 11:00 AM | Koushik Ray |
|---|---|
| 11:15 AM - 12:15 PM | Anurag Sahay |
| 2:30 PM - 3:30 PM | Vinay Malvimat |
| 3:30 PM - 4:30 PM | Tapobrata Sarkar |
| 4:50 PM - 5:30 PM | Conclusion session |