# Past Events

Date/Time: Thursday, November 16, 2017 - 16:00 to 17:15
Venue: SMS SEMINAR HALL
Speaker: Dr. Kunal Krishna Mukherjee , IIT Madras
Title: On dynamical system preserving weights

The canonical unitary representation of a locally compact separable group arising from an ergodic action of the group on a von Neumann algebra with separable predual preserving a faithful normal semifinite (infinite) weight is weak mixing. On the contrary, there exists a non...

Date/Time: Monday, November 13, 2017 - 11:30 to 12:30
Venue: Seminar Room, School of Mathematical Sciences
Speaker: Suprio Bhar, TIFR Bangalore
Title: Stochastic PDEs in the space of Tempered distributions

In this talk, we will discuss some recent results on the existence and uniqueness of strong solutions of certain classes of stochastic PDEs in the space of Tempered distributions. We show that these solutions can be constructed from the solutions of "related" finite dimensional stochastic...

Date/Time: Friday, November 10, 2017 - 15:45 to 16:45
Venue: Math Conference Room
Speaker: Sudeep Stephen, The University of Newcastle, Australia
Title: Zero forcing in graphs
Abstract: For a two-colouring of the vertex set of a simple graph $G=(V,E)$, consider the following colour-change rule: a red vertex is converted to blue if it is the only red neighbour of some blue vertex. A vertex set $S\subseteq V$ is called \emph{zero-forcing} if,...
Date/Time: Tuesday, November 7, 2017 - 13:30 to 14:30
Venue: Seminar Room, School of Mathematical Sciences
Speaker: Pabitra Barik, IIT Madras
Title: Hitchin pairs on a singular curve

In this talk, we present the moduli problem of rank 2 torsion free Hitchin pairs of fixed Euler characteristic $\chi$ on a reducible nodal curve. We de- scribe the moduli space of the Hitchin pairs. We define the analogue of the classical Hitchin map and describe the...

Date/Time: Monday, November 6, 2017 - 11:35 to 12:30
Venue: SMS seminar hall
Speaker: Satyaki Mazumder, IISER Kolkata
Title: Bayesian analysis of one dimensional chirp signal

Chirp signals are frequently used in different areas of science and engineering. MCMCbased Bayesian inference is done here for purpose of one step and multiple step prediction incase of one dimensional single chirp signal with i.i.d. error structure as well as dependenterror structure with...

Date/Time: Friday, November 3, 2017 - 16:30 to 18:00
Venue: Seminar Room, School of Mathematical Sciences
Speaker: Partha Sarathi Chakraborty, IMSc
Title: Instances of local index formula-II

Local Index formula is at the heart of the so called hard Riemannian aspects of Noncommutative Geometry. We will try to see why thisis so important. However so far we have only one computation of the local index formula. We will discuss two more computations.

Date/Time: Friday, November 3, 2017 - 15:30 to 16:30
Venue: SMS Seminar Hall
Speaker: Dr. Dibyendu Roy, NISER
Title: Non-randomness in the KSA of Grain Family of Stream Ciphers

Abstract: Stream ciphers are designed to provide randomness. In 2008, eSTREAM standardize some stream ciphers, Grain-v1 was among them. In this talk, I will talk about the existence of non-randomness of Grain-v1 and its variants for different rounds.

Date/Time: Monday, October 30, 2017 - 11:30 to 12:30
Venue: Seminar Room, School of Mathematical Sciences
Speaker: Partha Sarathi Chakraborty, IMSc
Title: Instances of local index formula

Local Index formula is at the heart of the so called hard Riemannian aspects of Noncommutative Geometry. We will try to see why thisis so important. However so far we have only one computation of the local index formula. We will discuss two more computations.

Date/Time: Monday, October 16, 2017 - 11:30 to 12:30
Venue: Seminar Room, School of Mathematical Sciences
Speaker: Soumalya Joardar, JNCASR, Bangalore
Title: Weyl algebra, Hyperbolic space and Noncommutative Hyperbolic plane

We propose a Weyl system represented on the Hilbert space $L^{2}(\mathbb{H}^{2}, d\mu)$ where $\mathbb{H}^{2}$ is the Hyperbolic plane and $d\mu$ is the corresponding hyperbolic measure. We give four canonical derivations on the algebra and using them propose a Lindbladian...

Date/Time: Friday, October 13, 2017 - 09:30 to 10:30
Venue: SMS Seminar Room
Speaker: Antar Bandyopadhyay, Indian Statistical Institute, New Delhi
Title: De-Preferential Attachment Random Graphs

Abstract: In this talk we will introduce a new model of a growing sequence of random graphs where a new vertex is less likely to join to an existing vertex with high degree and more likely to join to a vertex with low degree. In contrast to the well studied model of...