Richard Montgomery, Mathematics Professor,


Publications
N body : animations, open problems, links
subRiemannian

geodesics in the Heisenberg group; Nov. 1, 2009


Classes. Lecture Notes
Teaching schedule, Winter 2012
Collaborators
vita ( 2009)
email: rmont at ucsc period edu ; phone:831- 459-4841
office: 4120 McHenry. ! moved summer 2011!
... finding the 4th floor can be non-trivial

photo galleries
passages I like ...

Sup1.Jpg

Chuck Stanley. Bald Rock June 2009. taken by Daren Commons
all time best kayak video (4 min 50 sec)


more paddling shtuff

some recommended math books :
Math sites for classical geometry :

some basic formulae -- maybe more late r ; Jacobi coord; shape variables ...
Ph.D. Students


Research Blurb

(written Decemeber, 2011:) For much of the past decade or my primary mathematical obsession has been the planar zero-angular momentum three body problem. The basic question inside that problem is still open after 344 years of work. Arbitrarily close to a bounded (eg. periodic) solution, does there exist an unbounded solution?
My methods and thinking come primarily from differential geometry, so I might be called an applied differential geometer. Calculus of variations, dynamical systems, a bit of Lie group theory, and a smidge of topology often arise in my papers. Lately algebraic geometry has been sneaking in, due to the influences of blow-up on my work with Zhitomirskii and the birth of a K3 inside the planar 4 body problem.
A big influence on my career has been gauge theory, i.e. teh geometry and analysis around principal bundles with connections. Following physicists Shapere, Wilczek and Guichardet, I explored the connections between gauge theory and questions in mechanics and control such as how does how a cat, dropped from upside down, with zero angular momentum? Idealizing the cat to consist of only three mass points led me deep into the jungle of the three-body problem, where I have stumbling about in wonderment since.

1982-1988. Symplectic and Poisson reduction. What is the reduced space of the cotangent bundle of a principal bundle?
1986-1998. Falling cats. The isholonomic problem. Subriemannian geometry, culminating in the `abnormal geodesic' and a book titled `A tour of SubRiemannian Geometry'.
1999-2011. Beginning with the rediscovery of Cris Moore's figure eight solution to the three body problem, Chenciner and I helped open up a mini-industry of `choreography' solutions to the N-body problem. Perhaps my most general result in this area is the theorem that with the exception of Lagrange's orbit every zero angular momentum negative energy solution to the three body problem has instants of collinearity (`syzygies').
2002- 2011. Various problems and the interstices of singularity theory, geometry of plane-fields (distributions), and algebraic geometry, culminating in a book with Misha Zhitomirskii: `Points and Curves in the Monster Tower'.

Ph.D. Students

Alex Castro (2010), UCSC.
Vidya Swaminathan (2008), UCSC
William C. McCain (2007), UCSC
Andrew Klingler, 1999. thesis: Stochastic Calculus and Eigenvalue bounds for Geometric Laplacians.

Alex Golubev, 1999. (co-advised with Viktor Ginzburg.) thesis: A Gray's theorem for Engel Structures.

Cesar Castilho, 1998. (co-advised with Viktor Ginzburg.) thesis: The Motion of a Charged Particle on a Riemannian Surface under a Non-zero Magnetic Field
email: castilho@dmat.ufpe.br.
professor at: Departamento de Matematica Universidade Federal de Pernambuco Recife, PE 50540-740 Brazil

Kurt Ehlers, 1995. thesis: The Geometry of Swimming and Pumping at Low Reynolds Number
email: kehlers@scs.unr.edu Reno Community College.

Girija Mittagunta, 1994. (co-advised with Tudor Ratiu.)
thesis: Reduced Spaces for Coupled Rigid Bodies and Their Relation to Relative Equilibria

Patrick Tantalo, 1993, (UCSC) (co-advised with Tudor Ratiu.)
thesis: Geometric Phases for the Free Rigid Body with Variable Inertia Tensor. Now a lecturer in Computer Science/ Engineering, UCSC.

Gil Bor, 1991 (Berkeley), ( unofficial student, co-advised with Jerry Marsden.) thesis: Non-self dual solutions to the Yang-Mills equations over the four-sphere.
Now at CIMAT, Guanajuato , Mexico.
email: gil@fractal.cimat.mx

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updated, Dec 5, 2011