University of Cambridge > Talks.cam > Geometry and Topology colloquium > A Hopf index for isotropic sections of bundles with quadratic forms

  Browse A-Z

Log in

University Account External (via Google)

🔐 Log In

Information on

Subscribing to talksdetails Finding a talkdetails Adding a talkdetails Disseminating talksdetails Help and Documentationdetails

ℹ️ Information

A Hopf index for isotropic sections of bundles with quadratic forms

Download to your calendar using vCal

  • UserRichard Thomas, Imperial College London.
  • ClockWednesday 19 November 2025, 14:15-15:15
  • HouseMR13.

If you have a question about this talk, please contact Dhruv Ranganathan .

The Hopf index theorem counts solutions of equations via a winding number. I’ll review this and give 8 equivalent formulations. Then I’ll describe 8 analogues for equations which form “isotropic sections” of “bundles with quadratic form”. There are applications to “cosection localised virtual cycles” and to “DT4 virtual cycles”, but mainly I’ll focus on more elementary topics. This is joint work with Martijn Kool, Jeongseok Oh and Jørgen Rennemo.

This talk is part of the Geometry and Topology colloquium series.

This talk is included in these lists:

Note that ex-directory lists are not shown.

Other lists

Senior Parlour, Gonville & Caius College TheNewsInsides - For SaaS Writers Webinar & LT2, Computer Laboratory, William Gates Building.

Other talks

A flexible Monte Carlo quantitative bias analysis for unmeasured confounding Professor Philip Rosenstiel, W3 Professor of Clinical Molecular Biology, Director, Institute of Clinical Molecular Biology (IKMB), Kiel University Title tbc Shape modes of CP^1 vortices Angular analyses of b -> s ee decays at LHCb How Far Can Good Go Without God? The Limits of a Naturalistic Ethic
 

© 2006-2025 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity