Clay Research Award
The Clay Mathematics Institute presents the Clay Research Award annually to recognize major breakthroughs in mathematical research. Awardees receive the bronze sculpture "Figureight Knot Complement vii/CMI" by sculptor Helaman Ferguson.
2008
Cliff Taubes
For his proof of the Weinstein conjecture in dimension three.
The Weinstein conjecture is a conjecture about the existence of closed orbits for the Reeb vector field on a contact manifold. A contact manifold is an odd-dimensional manifold with a one-form A such that A wedged with the n-th exterior power of dA is everywhere nonzero. In particular, the kernel of A is a maximally nonintegrable field of hyperplanes in the tangent bundle. The Reeb vector field generates the kernel of dA and pairs to one with A. Alan Weinstein asked some thirty years ago whether this vector field must, in all cases, have a closed orbit. (The unit sphere in complex n-space with A the annihilator of the maximal complex subspace of the real tangent space is an example of a contact manifold and contact 1-form. In this case, the orbits of the Reeb vector field generate the circle action whose quotient gives the associated complex projective space.) Note, by contrast, that there exist non-contact vector fields, even on the 3-sphere, with no closed orbits. These are the counter-examples (due to Schweitzer, Harrison and Kuperberg) to the Seifert conjecture. Hofer affirmed the Weinstein conjecture in many 3-dimensional cases, for example the three-sphere and contact structures on any 3 dimensional, reducible manifold. Taubes' affirmative solution of the Weinstein conjecture for any 3-dimensional contact manifold is based on a novel application of the Seiberg-Witten equations to the problem.
Claire Voisin
For her disproof of the Kodaira conjecture.
The Kodaira conjecture was formulated in 1960, when Kunihiko Kodaira showed that any compact complex Kaehler surface can be deformed to a projective algebraic surface. For the proof, Kodaira used his classification theorem for complex surfaces. The conjecture asks whether Kaehler manifolds of higher dimension can be deformed to a projective algebraic manifold. Voisin constructs counterexamples: in each dimension four or greater, there is a compact Kaehler manifold which is not homotopy equivalent to a projective one. For dimension at least six, she gives examples which are also simply connected. A later result gives a substantial strengthening: in any even dimension ten or greater, there exist compact Kaehler manifolds, no bimeromorphic model of which is homotopy equivalent to a projective algebraic variety. Distinguishing the homotopy type of projective and non-projective Kaehler manifolds is achieved through novel Hodge-theoretic arguments that place subtle restrictions on the topological intersection ring of a projective manifold.
2007
Alex Eskin
For his work on rational billiards and geometric group theory, in particular, his crucial contribution to joint work with David Fisher and Kevin Whyte establishing the quasi-isometric rigidity of sol.
Christopher Hacon and James McKernan
For their work in advancing our understanding of the birational geometry of algebraic varieties in dimension greater than three, in particular, for their inductive proof of the existence of flips.
Michael Harris and Richard Taylor
For their work on local and global Galois representations, partly in collaboration with Clozel and Shepherd-Barron, culminating in the solution of the Sato-Tate conjecture for elliptic curves with non-integral j-invariants.
2005
Manjul Bhargava
CMI recognizes Manjul Bhargava for his discovery of new composition laws for quadratic forms, and for his work on the average size of ideal class groups. The field of composition laws had lain dormant for 200 years since the pioneering work of C.F Gauss. The laws discovered by Bhargava were a complete surprise, and led him to another major breakthrough, namey, counting the number of quartic and quintic number fields with given discriminant. The ideal class group is an object of fundamental importance in number theory. Nonetheless, despite some conjectures of Cohen and Lenstra about this problem, there was not a single proven case before Bhargava's work. Bhargava solved the problem for the 2-part of the class groups of cubic fields, in which case, curiously, the numerical evidence had led people to doubt the Cohen-Lenstra heuristics.
Nils Dencker
CMI recognizes Nils Dencker for his complete resolution of a conjecture made by F. Treves and L. Nirenberg in 1970. This conjecture posits an essentially geometric necessary and suffcient condition, "Psi", for a pseudo-differential operator of principal type to be locally solvable, i.e., for the equation Pu = f to have local solutions given a finite number of conditions on f. Dencker's work provides a full mathematical understanding of the surprising discovery by Hans Lewy in 1957 that there exist a linear partial differential operator -- a one-term, third-order perturbation of the Cauchy-Riemann operator -- which is not local solvable in this sense. The necessity of condition "Psi" was shown for operators in dimension 2 by R. Moyer in 1978 and in general by L. Hormander in 1981. The sufficiency of the condition has resisted many previous attacks.
2004
Ben Green
Ben Green was recognized for his joint work with
Terry Tao on arithmetic progressions of prime
numbers. These are equally spaced sequences of
primes such as 31, 37, 43 or 13, 43, 73, 103.
Results in the area go back to the work of
Lagrange and Waring in the 1770's. A major
breakthrough came in 1939 when the Dutch
mathematician Johannes van der Corput showed that
there are an infinite number of three-term
arithmetic progressions of primes. Green and Tao
showed that for any n, there are infinitely many
n-term progressions of primes. Their proof, which
relies on results of Szemerédi (1975) and Goldston
and Yildirim (2003), uses ideas from combinatorics,
ergodic theory, and the theory of pseudorandom
numbers. The Green-Tao result is a major advance
in our understanding of the primes.
Ben Green's CMI Lecture
Gérard Laumon and Bao-Châu Ngô
Laumon and Ngô were recognized for their proof of the
Fundamental Lemma for unitary groups. The lemma is a conjectured
identity between orbital integrals for two groups, e.g., the unitary
groups U(n) and U(p)xU(q), where p+q = n. Combined with the
Arthur-Selberg trace formula, it enables one to prove relations
between automorphic forms on different groups and is a key step
towards proving links between certain automorphic forms and Galois
representations. This is one of the aims of the Langlands program,
which seeks a far-reaching unification of ideas in number theory and
representation theory. The result of Laumon and Ngô uses the
equivariant cohomology approach introduced by Goresky, Kottwitz, and
MacPherson, who proved the lemma in the split and equal valuation
case. The proof for the unitary case, which is significant for
applications, requires many new ideas, including Laumon's deformation
strategy and Ngô's purity result which is based on a geometric
interpretation of the endoscopy theory of Langlands and Kottwitz in
terms of the Hitchin fibration.
Laumon's CMI Lecture
2003
Richard Hamilton
For his discovery of the Ricci Flow Equation and its development into one of the most powerful tools of geometric analysis. Hamilton conceived of his work as a way to approach both the Poincaré Conjecture and the Thurston Geometrization Conjecture; presented on November 14, 2003 in Cambridge, MA.
Terence Tao
For his ground-breaking work in analysis, notably his optimal restriction theorems in Fourier analysis, his work on the wave map equation (the hyperbolic analogue of the harmonic map equation), his global existence theorems for KdV type equations, as well as significant work in quite distant areas of mathematics, such as his solution with Allen Knutson of Horn's conjecture, a fundamental problem about hermitian matrices that goes back to questions posed by Hermann Weyl in 1912; presented on November 14, 2003 in Cambridge, MA.
2002
Oded Schramm
For his work in combining analytic power with geometric insight in the field of random walks, percolation, and probability theory in general, especially for formulating stochastic Loewner evolution. His work opens new doors and reinvigorates research in these fields; presented on October 30, 2002 in Cambridge, MA.
Manindra Agrawal
For finding, jointly with two undergraduate students, an algorithm that solves a modern version of a problem going back to the ancient Chinese and Greeks about how one can determine whether a number is prime in a time that increases polynomially with the size of the number; presented on October 30, 2002 in Cambridge, MA.
2001
Edward Witten
For a lifetime of achievement, especially for pointing the way to unify apparently disparate fields of mathematics and to discover their elegant simplicity through links with the physical world, presented on July 13, 2001 in Washington, DC.
Stanislav Smirnov
For establishing the existence of the scaling limit of two-dimensional percolation, and for verifying John Cardy's conjectured relation, presented on July 13, 2001 in Washington, DC.
2000
Alain Connes
For revolutionizing the field of operator algebras, for inventing modern non-commutative geometry, and for discovering that these ideas appear everywhere, including the foundations of theoretical physics; presented on May 24, 2000 in Paris, France.
Laurent Lafforgue
For his work on the Langlands program, presented on May 24, 2000 in Paris, France. Orsay preprint or IHES preprint
1999
Andrew Wiles
For his role in the development of number theory, presented on May 10, 1999 in Cambridge, MA.
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