MathOverflow is a question and answer site for professional mathematicians. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Is there any work on Morse-Bott homology for infinite-dimensional manifolds (e.g. Hilbert manifolds). I am particularly interested in the case where we have a locally trivial fiber bundle and the Morse-Bott function is the function on the total space which is a pulled back Morse function on the base.

share|cite|improve this question
Orbicular, can you be a little more specific? Is the base of the bundle finite-dimensional? What's a Morse-Bott function, for you? (Finite-dim critical manifolds? Finitely many negative eigenvalues of the Hessian?) Depending on the specifics, references might be Bott's "Stable homotopy of the classical groups" or Cohen-Jones-Segal's "Floer's infinite-dimensional Morse theory and homotopy theory". – Tim Perutz Jun 11 '10 at 13:41
I am interested in the path space fibration (free loop space over the base with fiber the based loop space) and the loop space of a locally trivial fibre bundle (fibre and base closed and finite-dimensional) – Orbicular Jun 11 '10 at 19:23
Did you have a look at Klingenberg's 'Lectures on Closed Geodesics'? He uses Morse-Bott theory for free loop spaces. – Lennart Meier Jun 11 '10 at 20:44
@Lennart: Correct me if I'm wrong, but I always thought Klingenberg was dealing with Morse theory for the energy functional on the free loop space. Time-shifting the "time" coordinate of your closed geodesic gives you another one, yielding S^1-families of critical points (in the nondegenerate case). But I am specifically interested in the case where the fibers are not of finite dimension, as for example in the fibration based loop space -> free loop space ->> base manifold. – Orbicular Jun 12 '10 at 9:02
The literal answer to your question ("is there work...?") is "lots", including the loop-space examples you discussed with Lennart, and various Floer-theoretic examples. But there's no overarching theory, because of the subtleties of gradient flows in infinite dimensions (see e.g. Jost's "Riemannian geometry and geometric analysis"), so you may want to focus your question further. – Tim Perutz Jun 13 '10 at 1:01

See Atiyah and Bott's papers on Yang-Mills for Riemann surfaces.
The essence of it is that the Yang-Mills functional acts like a perfect Morse functional after quotienting by gauge transformations. So, look at it before the quotient to get your Morse-Bott function.

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.