Chennai Mathematical Institute

Seminars

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Today's Seminar

23-02-26
Physics Seminar
Date: Monday, 23 February 2026
The seminar will follow the usual format:
11:00-11:30 a.m.: pre-seminar
11:30-11:45 a.m.: tea/coffee
11:45-1:00 p.m.: seminar
Venue: Lecture Hall 6
A New Cosmological Puzzle: Fast Radio Bursts and the Hubble Constant
Surajit Kalita
Astronomical Observatory, University of Warsaw.
Abstract
Fast Radio Bursts (FRBs) are millisecond radio transients with high dispersion measures, making them powerful tracers of ionized matter across cosmological distances. In this talk, I present two complementary approaches, Bayesian analysis and machine learning, applied to a set of localized FRBs to rigorously test the consistency of the Lambda-CDM model at late cosmic epoch. Our results reveal a redshift-dependent variation in the inferred Hubble constant, a behavior that stands in contradiction to the core postulate standard cosmology. I will further show that this discrepancy can be resolved for alternate cosmological models. These findings suggest a fundamental inadequacy in the standard cosmological framework and necessitate a deeper revision of the theoretical underpinnings of cosmology to resolve the Hubble tension.

Forthcoming Seminars

27-02-26
K. Lakshmanan Memorial Distinguished Lecture
Date: Friday, 27 February 2026
Time: 2.00 to 3.30 p.m
Venue: Seminar Hall
On scaling a given multi dimensional matrix to achieve a prescribed one dimensional marginals

T. E. S. Raghavan
Dept. of Mathematics and Statistics, University of Illinois, Chicago.
27-02-26
R.K. Rubugunday Distinguished Lecture
Date: Friday, 27 February 2026
Time: 3.30 to 4.30 p.m
Venue: Seminar Hall
Cell-resolution imaging and mapping of whole human brains - When AI meets the Real Neural Networks

Mohanasankar Sivaprakasam
Dept. of Electrical Engineering, IIT Madras.
27-02-26
Data Science Seminar
Date: Friday, 27 February 2026
Time: 2.00 - 3.00 p.m.
Venue: NKN Hall
Deep Signature Approach for McKean-Vlasov FBSDEs in a Random Environment

Mathieu Lauriere
Assistant Professor of Mathematics and Data Science, NYU Shanghai.

Past Seminars (this year)

20-02-26
Seminar Announcement
Date: Friday, 20 February 2026
Time: 3.30 - 4.45 p.m.
Venue: Seminar Hall
Elliptic Characteristic Classes and Hecke Algebra

Andrzej Weber
Mathematical Institute, University of Warsaw.
16-02-26
Talk Announcement
Date: Monday, 16 February 2026
Time: 3.30 p.m.
Venue: Seminar Hall
Diagnosis - a privilege of the laboratory in medical practice

Dr. Raji Swamy
16-02-26
Physics Seminar
Date: Monday, 16 February 2026
The format of the talk is:
Pre-seminar: 11.00-11.30am
Coffee Break: 11.30-11.45am
Main seminar: 11.45am-1.00pm
Venue: Lecture Hall 6
Doubly Separable Spacetimes and Symmetry Constraints on their Self-Gravitating Matter Content

Prashant Kocherlakota
Chennai Mathematical Institute.
16-02-26
Computer Science Seminar
Date: Monday, 16 February 2026
Time: 2.00 p.m.
Venue: Seminar Hall
A simple proof of Kamp's Theorem

Paul Gastin
LMF, ENS Paris-Saclay, France.
20-02-26
Lecture series announcement
Date: 11, 18 and 20 February 2026
Time: 9.10 - 10.30 a.m.
Venue: LH801
Proof of Zielonka's theorem through Propositional Dynamic Logic and Cascade products

Paul Gastin
LMF, ENS Paris-Saclay, France.
10-02-26
Lecture Series on Social Choice Theory
Lectures 1 and 2: Tuesday, 3 February 2026, from 10:30 a.m. to 1:05 p.m.
Lectures 3 and 4: Tuesday, 10 February 2026, from 10:30 a.m. to 1:05 p.m.
Venue: Lecture Hall 801
Lecture Series on Social Choice Theory

Ori Livson
University of Sydney.
09-02-26
Seminar Announcement
Date: Monday, 9 February 2026
Time: 3.30 p.m. to 4.30 p.m.
Venue: Lecture Hall 3
Condorcets Paradox as Non-Orientability

Ori Livson
University of Sydney, Australia.
04-02-26
Physics Seminar
Date: Wednesday, 4 February 2026
Time: 2.00 to 3.00 p.m.
Venue: Lecture Hall 4
Bayesian inference of neutron star equations of state and analysis of stellar oscillations

Debanjan Guha Roy
BITS Pilani, Hyderabad Campus.
09-02-26
Physics Seminar
Date: Monday, 9 February 2026
Time: 11.00 a.m. to 1.00 p.m.
Venue: Lecture Hall 6
The Geometrical Trinity of Gravity & Its Implications for Neutron Star Structure

Sneha Pradhan
BITS Pilani, Hyderabad.
03-02-26
Seminar Announcement
Date: Tuesday, 3 February 2026
Time: 2.00 to 3:30 p.m.
Venue: Lecture Hall 1
Group Order and Group Non-Membership is in QCMA

Dhara Thakkar
Graduate School of Mathematics, Nagoya University.
06-02-26
Seminar Announcement
Date: Friday, 06 February 2026
Time: 3.30 p.m.
Venue: Seminar Hall
q-opers, QQ-systems and Bethe Ansatz for spin chains

Rahul Singh
YMSC, Tsinghua University.
02-02-26
Lecture Announcement
Date: Monday, 2 February 2026
Time: 2.00 p.m.
Venue: Seminar Hall
On Proper Descent of Smooth Affine Surfaces with Finite Homotopy Rank-Sum

Buddhadev Hajra
ISI Kolkata.
02-02-26
Physics Seminar
Date: Monday, 2 February 2026
Venue: Lecture Hall 6
Time: 11.00 a.m. to 1.00 p.m
String Compactifications And Cosmological Solutions, GKP Geometric Moduli

Ratul Mahanta
USTC, Hefei.
30-01-26
Physics Seminar
Date: Friday, 30 January 2026
Time: 11:45 a.m.
Venue: Seminar Hall
LIGO-India and the future of Gravitational Wave Astronomy

Sanjit Mitra
IUCAA, Pune.
28-01-26
Seminar Announcement
Date: Wednesday, 28 January 2026
Time: 3.30 to 4.30 p.m.
Venue: Seminar Hall
Some early Ramsey type theorems and some applications

S. D. Adhikari
RKMVERI.
04-02-26
Lecture series announcement
Dates: 27, 28, 30 January and 2 & 4 February 2026
Time: 3.45 to 4.45 PM
Venue: NKN Hall (hybrid mode)
Mock modularity of Calabi-Yau threefolds and BPS black holes

Sergey Alexandrov
Laboratoire Charles Coulomb and University of Montpellier, CNRS, France.
03-02-26
Lecture series announcement
The dates of his lectures are:
Lectures 1 and 2 will be on January 16 at 3:30 p.m. Both talks will be 45 minutes long, with a short break.
Lectures 3 and 4 will be on January 27 and 29 from 3:30 p.m. to 4.30 p.m.
Lectures 5 and 6 will be on February 2 and 3 from 3:30 p.m. to 4.30 p.m.
Venue: Seminar Hall, CMI (hybrid mode)
Actions of finite group schemes

Michel Brion
Institut Fourier at the UniversitE Grenoble Alpes, France.
23-01-26
Physics Seminar
Date: Friday, 23 January 2026
Time: 10.30 a.m. to 11.30 a.m.
Venue: Lecture Hall 6
Emergent Higher-Spin Symmetry on the Celestial Sphere from Loop-Corrected Soft Photon Theorems

Biswajit Sahoo
Kings College, London.
22-01-26
Physics Seminar
Date: Thursday, 22 January 2026
Venue: Lecture Hall 2
Time: 1.30 p.m to 2.45 p.m.
Modeling the gravitational-wave memory for coalescing compact binaries

Marc Favata
Montclair State University, USA.
16-01-26
Data Science Seminar
Date: Friday, 16 January 2026
Time: 2:00 p.m.
Venue: NKN Hall
Small Language Models: Design, Fine-Tuning and Deployment

Sudhir Kumar
Coriolis Technologies.
16-01-26
Seminar Announcement
Date: Friday, 16 January 2026
Time: 11.45 a.m.
Venue: Seminar Hall
Class groups of Kummer extensions associated to CM Elliptic curves

Arindam Bhattacharya
University of Massachusetts, Amherst.
16-01-26
Seminar Announcement
Date: Friday, 16 January 2026
Time: 11.45 a.m
Venue: Lecture Hall 1
A new characterization of VNP via Colored Determinant

Prasad Chaugule
IIT Delhi.
13-01-26
Seminar Announcement
Date: Tuesday, 13 January 2026
Time: 12:00 p.m
Venue: Lecture Hall 4
On the relative power of reduction notions in different characteristics

Prasad Chaugule
IIT Delhi.
13-01-26
Physics Seminar
Date: Tuesday, 13 January 2026
Time: 3:45 p.m.
Venue: Lecture Hall 6
Mock Modular forms and Vafa Witten Theory

Aradhita Chattopadhyaya
Chennai Mathematical Institute.
12-01-26
Physics Seminar
Date: Monday, 12 January 2026
Time: 3:45 p.m.
Venue: Lecture Hall 6
Mock Modular forms and Vafa Witten Theory

Aradhita Chattopadhyaya
Chennai Mathematical Institute.
12-01-26
Physics Seminar
Date: Monday, 12 January 2026
Time: 11.00 am to 1.00 p.m.
Venue: Lecture Hall 6
Boundary Energy-Momentum Tensors for Asymptotically Flat Spacetimes

Vijay Nenmeli
University of Edinburgh.
09-01-26
Computer Science Seminar
Date: Friday, 9 January 2026
Time: 2.00 - 3.15 p.m.
Venue: Seminar Hall
The complexity of the factors of polynomials

Somnath Bhattacharjee
University of Toronto.
07-01-26
Lecture Announcement
Date: Wednesday, 7 January 2026
Time: 4:00 p.m. - 4:30 p.m.
Venue: Seminar Hall
A Torelli type theorem for elliptic curves

Tomasz Szemberg
University of the National Education Commission, Krakow, Poland.
07-01-26
Lecture Announcement
Date: Wednesday, 7 January 2026
Time: 3:30 - 4:00 p.m.
Venue: Seminar Hall
Configurations of points in projective space and their projections

Justyna Szpond
University of the National Education Commission, Krakow, Poland.
06-01-26
Seminar Announcement
Date: Tuesday, 6 January 2026
Time: 2.00 to 3.30 p.m.
Venue: Seminar Hall
Redundancy is all you need (for CSP sparsification)

Venkatesan Guruswami
UC Berkeley and Simons Institute.
05-01-26
Seminar Announcement
Date: Monday, 5 January 2026
Time: 2.00 to 3.30 p.m.
Venue: Seminar Hall
Optimal Proximity Gaps for Subspace-Design Codes and (Random) Reed-Solomon Code\ s

Rohan Goyal
MIT.
05-01-26
Mathematics Seminar
Date: Monday, 5 January 2026
Time: 3.30 to 4.30 p.m.
Venue: Seminar Hall
The inverse system of Gorenstein points

Maria Evelina Rossi
University of Genoa.