Chennai Mathematical Institute

Seminars




Today's Seminar
  • 12-02-25
    Physics Seminar
    Date: Wednesday, 12 February 2025
    Time: 1.45 PM
    Venue: Lecture Hall 2
    Thermodynamics of topological Dyonic hairy black holes and interplay of QNMs at the phase transition
    Supragyan Priyadarshinee
    IISER, Mohali.
    Abstract
    We present and discuss a new family of topological hairy dyonic black hole solutions in asymptotically anti–de Sitter space. The coupled Einstein-Maxwell-scalar gravity system, that carries both the electric and magnetic charges is solved, and exact hairy dyonic black hole solutions are obtained analytically. The scalar field profiles that give rise to such black hole solutions are regular everywhere. The hairy solutions are obtained for planar, spherical, and hyperbolic horizon topologies. In addition, analytic expressions of regularized action, stress tensor, conserved charges, and free energies are obtained. We further comment on different prescriptions for computing the black hole mass with hairy backgrounds. We analyze the thermodynamics of these hairy dyonic black holes in canonical and grand canonical ensembles, and we find that both electric and magnetic charges have a constructive effect on the stability of the hairy solution. For the case of planar and hyperbolic horizons, we find thermodynamically stable hairy black holes that are favored at low temperatures compared to the nonhairy counterparts. We further find that, for a spherical hairy dyonic black hole, the thermodynamic phase diagram resembles to that of a Van der Waals fluid not only in canonical but also in the grand canonical ensemble. Then, we explore the dynamics of the massless scalar field in the context of hairy black holes at the phase transition, utilizing both the series solution and shooting methods, we numerically compute the corresponding quasinormal modes (QNMs) across various black hole parameters. Notably, the values obtained from these two methods exhibit robust agreement. The consistently negative imaginary part of the QNM underscores the stability of the massless scalar field in the backdrop of the black hole. Our investigation reveals that both the decay and oscillatory modes of the scalar field perturbation exhibit a linear increase with the horizon radius, particularly notable for large black holes. We conduct a comprehensive analysis of QNMs across diverse black hole parameters, encompassing the electric charge, magnetic charge, horizon radius, and the hairy parameter. Moreover, we extend our scrutiny to the QNM behaviour near the small/large black hole phase transition. Intriguingly, we discern distinct characteristics in the nature of QNMs between the large and small black hole phases, indicating the potential of QNMs as a probing tool for black hole phase transitions.


Today's Seminar
  • 12-02-25
    Seminar Announcement
    Date: Wednesday, 12 February 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Mathematics in Industrial Machinery at TRUMPF Metamation
    Wadehn Wolf
    CEO TRUMPF Metamation.
    Abstract
    - Technology steps of TRUMPF

    - Overview on sheet metal machines

    - Mathematical production and optimization problems in:

    - Laser cutting: From a sheet to the part

    - Bending: From a 3D geometry to a bend sequence

    - Production: Intralogistics

    - Control of Robots and cartesian machines

    - Student challenge (Nesting)


Forthcoming Seminars
  • 14-02-25
    Data Science Seminar
    Date: Friday, 14 February 2025
    Time: 2:00 - 3:00 PM
    Venue: NKN Hall
    Subdata selection: Introduction and Recent Works(Abstract)
    Rakhi Singh
    IIT Madras.

  • 14-02-25
    Seminar Announcement
    Date: Friday, 14 February 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Modular Descriptions of Regular Functions(Abstract)
    Paul Gastin
    LMF, ENS Paris-Saclay, France.

  • 18-02-25
    Seminar Announcement
    Date: Tuesday, 18 February 2025
    Time: 2:00 PM
    Venue: Seminar Hall
    Root Clusters(Abstract)
    Shubham Jaiswal
    IISER Pune.

  • 20-02-25
    Mathematics Seminar
    Date: Thursday, 20 February 2025
    Time: 3:30 to 4:30 PM
    Venue: Seminar Hall
    A density function for the epsilon multiplicity and applications to integral closures(Abstract)
    Suprajo Das
    IIT Madras.

  • 24-02-25
    R.K. Rubugunday Distinguished Lecture
    Date: Monday, 24 February 2025
    Time: 2:00 - 3:00 PM
    Venue: Seminar Hall
    Sustainability - Data, Models and Pedagogy(Abstract)
    Milind Sohoni
    Computer Science Dept, IIT Bombay and CTARA IIT Bombay.

  • 24-02-25
    K. Lakshmanan Memorial Distinguished Lecture
    Date: Monday, 24 February 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Title: TBA(Abstract)
    Shiraz Minwalla
    TIFR Mumbai.

  • 26-02-25
    Seminar Announcement
    Date: Wednesday, 26 February 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Vector bundles in tropical geometry: An elementary approach(Abstract)
    Martin Ulirsch
    Goethe University, Frankfurt.

  • 28-02-25
    Chennai Combinatorics Colloquium Series
    Date: Friday, 28 February 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    A walk through the history and present of Perfect Matchings(Abstract)
    Nishad Kothari
    IIT Madras.

Past Seminars (this year)
  • 10-02-25
    Computer Science Seminar
    Speaker: K S Thejaswini, Institute of Science and Technology, Austria
    Date: Monday, 10 February 2025
    Time: 10.30 AM
    Venue: Seminar Hall
    Resolving nondeterminism with randomness(Abstract)
    K S Thejaswini
    Institute of Science and Technology, Austria.

  • 05-02-25
    Seminar Announcement
    Date: Wednesday, 5 February 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Recent developments in numerical invariants in prime characteristic commutative algebra(Abstract)
    Alapan Mukhopadhyay
    Ecole Polytechnique Federale de Lausanne (EPFL).

  • 05-02-25
    Mathematics Colloquium
    Date: Wednesday, 5 February 2025
    Time: 2.00 PM
    Venue: Seminar Hall, CMI
    Special points on moduli spaces(Abstract)
    Ananth Shankar
    Northwestern University.

  • 05-02-25
    Physics Seminar
    Date: Wednesday, 5 February 2024
    Time: 1.45 PM
    Venue: Lecture Hall 2
    QCD-Gravity double-copy in the Regge regime via shockwave collisions(Abstract)
    Himanshu Raj
    Stony Brook University, USA.

  • 04-02-25
    Computer Science Seminar
    Speaker: Sreejith A. V., IIT Goa
    Date: Tuesday, 4 February 2025
    Time: 3.45 - 4.45 PM
    Venue: Seminar Hall
    Active learning of one counter automata(Abstract)
    Sreejith A. V.
    IIT Goa.

  • 04-02-25
    Physics Seminar
    Date: Tuesday, 04 February 2025
    Time: 1.45 PM
    Venue: Lecture Hall 2
    Fundamental strings, gravity and quantum processors(Abstract)
    Ayan Mukhopadhyay
    Instituto de Física, Pontificia Universidad Católica de Valparaíso.

  • 29-01-25
    Physics Seminar
    Date: Wednesday, 29 January 2025
    Time: 1.45 PM
    Venue: Lecture Hall 2
    Supertranslations at Spatial and Timelike Infinities in the First-Order Formalism(Abstract)
    Divyesh Solanki
    IIIT Allahabad.

  • 28-01-25
    Physics Seminar
    Date: Tuesday, 28 January 2025
    Time: 1:45 PM
    Venue: Lecture Hall 2
    An equivalence of three butterflies in Lifshitz background(Abstract)
    Banashree Baishya
    IIT Guwahati.

  • 24-01-25
    Physics Seminar
    Date: Friday, 24 January 2025
    Time: 3:45 PM
    Venue: Lecture Hall 2
    A classical dimer model with a discrete-scale-invariant fixed point(Abstract)
    Sounak Biswas
    Universität Würzburg, Germany.

  • 24-01-25
    Computer Science Seminar
    Speaker: S. Arun Kumar, GITAM University
    Date: Friday, 24 January 2025
    Time: 2:00 PM
    Venue: Seminar Hall
    Extending Process Algebra with an undefined action(Abstract)
    S. Arun Kumar
    GITAM University.

  • 24-01-25
    Physics Seminar
    Date: Friday, 24 January 2025
    Time: 1:45 PM
    Venue: Lecture Hall 3
    New Insights into Strong Gravity from Accreting Supermassive Black Holes(Abstract)
    Prashant Kocherlakota
    Harvard University.

  • 23-01-25
    Physics Seminar
    Date: Thursday, 23 January 2024
    Time: 1.45 to 3 PM
    Venue: Lecture Hall 2
    Simplicity of In-In correlators(Abstract)
    Chandramouli Chowdhury
    University of Southampton.

  • 22-01-25
    Computer Science Seminar
    Date: Wednesday, 22 January 2025
    Time: 2 to 3 PM
    Venue: Seminar Hall
    Characterizing and Testing Principal Minor Equivalence of Matrices(Abstract)
    Sumanta Ghosh
    ISI Kolkata.

  • 22-01-25
    Seminar Announcement
    Date: Wednesday, 22 January 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Doing Morse theory without Smale condition(Abstract)
    Ipsita Datta
    ETH Zuerich.

  • 21-01-25
    Mathematics Seminar
    Date: Tuesday, 21 January 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Effective and minimal cones of weights for Hilbert modular forms (joint with P. Kassaei)(Abstract)
    Fred Diamond
    King's College, London.

  • 21-01-25
    Physics Seminar
    Date: Tuesday, 21 January 2025
    Time: 1:45 PM
    Venue: Lecture Hall 2
    Discovering Extraordinary Black Hole Mergers and their Origin(Abstract)
    Gayathri V
    University of Wisconsin-Milwaukee.

  • 21-01-25
    Public viva-voce Notification
    Date: Tuesday, 21 January 2025
    Time: 11:00 AM
    Venue: Seminar Hall
    Two Topics in Enumerative Combinatorics(Abstract)
    Krishna Menon P
    Chennai Mathematical Institute.

  • 21-01-25
    Seminar Announcement
    Date: Tuesday, 21 January 2025
    Time: 10.45 - 11.45 AM
    Venue: Lecture Hall 1
    Parsimonious Guarding(Abstract)
    Prahlad Narasimhan Kasthurirangan
    PhD student at Stony Brook University.

  • 20-01-25
    Seminar Announcement
    Date: Monday, 20 January 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Congruences and integral periods for GL3 over imaginary quadratic fields(Abstract)
    Baskar Balasubramanyam
    IISER Pune.

  • 17-01-25
    Data Science Seminar
    Speaker: Varun Ramanathan, Indexnine Technologies
    Date: Friday, 17 January 2025
    Time: 2:00 PM
    Venue: NKN Hall
    Ventures in AI: An Indexnine Journey(Abstract)
    Varun Ramanathan
    Indexnine Technologies.

  • 16-01-25
    Seminar Announcement
    Date: Thursday, 16 January 2025
    Time: 10:45 AM
    Venue: Seminar Hall
    Order-finding for Structured ABPs(Abstract)
    Anamay Tengse
    NISER Bhubaneswar.

  • 10-01-25
    Physics Seminar
    Date: Friday, 10 January 2025
    Time: 3:45 PM
    Venue: Lecture Hall 3
    Soft edges: the many links between soft and edge modes [Part-II]
    Bilyana Tomova
    Okinawa Institute of Science and Technology.

  • 08-01-25
    Physics Seminar
    Date: Wednesday, 8 January 2025
    Time: 3:45 PM
    Venue: Lecture Hall 3 Soft edges: the many links between soft and edge modes [Part-I]
    Gonçalo Araujo-Regado
    Okinawa Institute of Science and Technology.

  • 08-01-25
    Mathematics Seminar
    Date: Wednesday, 8 January 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    Non-maximal Toledo components(Abstract)
    Oscar Garcia-Prada
    ICMAT, Madrid.

  • 08-01-25
    Mathematics Seminar
    Date: Wednesday, 8 January 2025
    Time: 2:00 PM
    Venue: Seminar Hall
    Twisted triple product p-adic L-function for finite slope families and a p-adic Gross-Zagier formula(Abstract)
    Ananyo Kazi
    UniDistance Suisse.

  • 07-01-25
    Data Science Seminar
    Date: Tuesday, 7 January 2025
    Time: 3:30 PM
    Venue: Seminar Hall
    IoT Data Analysis: Learning and Anomaly Detection(Abstract)
    Nalini Ravishanker
    Department of Statistics, University of Connecticut, Storrs, CT, USA.

  • 07-01-25
    Seminar Announcement
    Date: Tuesday, 7 January 2025
    Time: 10:30 AM
    Venue: Seminar Hall
    SELP: A framework for implementing the perception-action loop in an AI agent(Abstract)
    Bonny Banerjee
    University of Memphis and the Institute for Intelligent Systems.

  • 06-01-25
    Computer Science Seminar
    Date: Monday, 6 January 2025
    Time: 3:45 PM
    Venue: Seminar Hall, CMI
    Differential geometry for solving 3D computer vision problems(Abstract)
    Shaifali Parashar
    LIRIS, INSA-Lyon, France.

  • 06-01-25
    Short Course on State-Space Models (Machine Learning)
    Date: Monday, 6 January 2025
    Time: 11.45 AM to 1.00 PM and 2.00 to 3.15 PM (2 lectures)
    Venue: Seminar Hall
    Title: A Tutorial on Mamba(Abstract)
    Ratish Surendran Puduppully
    NLP group at IT University, Copenhagen.

  • 07-01-25
    Seminar Announcement
    Date: Tuesday, 7 January 2025
    Time: 03:30 PM
    Venue: LH3
    Fast list-decoding of univariate multiplicity and Folded Reed-Solomon codes(Abstract)
    Rohan Goyal
    Massachusetts Institute of Technology, USA.

  • 03-01-25
    Physics Seminar
    Date: Friday, 3 January 2025
    Time: 03:30 PM
    Venue: LH1
    An Exterior Field Theory for Hawking Radiation
    Godwin Martin
    International Center for Theoretical Sciences (ICTS).

  • 03-01-25
    Physics Seminar
    Date: Friday, 3 January 2025
    Time: 11.30 AM
    Venue: LH1 Proper Time to Singularity and Thermal correlators
    Kaustubh Singhi
    International Center for Theoretical Sciences (ICTS).