Leonard Gross | |
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Born | Brooklyn, New York City, NY, U.S. | February 24, 1931
Alma mater |
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Spouse | Grazyna Gross |
Children | 2 |
Scientific career | |
Fields | Mathematics Mathematical physics |
Institutions | Cornell University |
Doctoral advisor | Irving E. Segal |
Doctoral students | Hui-Hsiung Kuo |
Website | math |
Leonard Gross (born February 24, 1931) is an American mathematician and Professor Emeritus of Mathematics at Cornell University. [1]
Gross has made fundamental contributions to mathematics and the mathematically rigorous study of quantum field theory.
Leonard Gross graduated from James Madison High School in December 1948. He was awarded an Emil Schweinberg scholarship [2] that enabled him to attend college. He studied at City College of New York for one term and then studied electrical engineering at Cooper Union for two years. He then transferred to the University of Chicago, where he obtained a master's degree in physics and mathematics (1954) and a Ph.D. in mathematics (1958). [3]
Gross taught at Yale University and was awarded a National Science Foundation Fellowship in 1959. [4] He joined the faculty of the mathematics department of Cornell University in 1960. Gross was a member of the Institute for Advanced Study in 1959 and in 1983 [3] and has held other visiting positions. He has supervised 35 doctoral students. [5]
Gross serves on the editorial boards of the Journal of Functional Analysis , [6] and Potential Analysis. [7]
Gross's scientific work has centered on the mathematically rigorous study of quantum field theories and related mathematical theories such as statistical mechanics. His early works developed the foundations of integration on infinite-dimensional spaces and analytic tools needed for quantum fields corresponding to classical fields described by linear equations. His later works have been devoted to Yang–Mills theory and related mathematical theories such as analysis on loop groups.
Gross's earliest mathematical works [8] were on integration and harmonic analysis on infinite-dimensional spaces. These ideas, and especially the need for a structure within which potential theory in infinite dimensions could be studied, culminated in Gross's construction of abstract Wiener spaces [9] in 1965. This structure has since become a standard framework [10] for infinite-dimensional analysis.
Gross was one of the initiators of the study of logarithmic Sobolev inequalities, which he discovered in 1967 for his work in constructive quantum field theory and published later in two foundational papers [11] [12] established these inequalities for the Bosonic and Fermionic cases. The inequalities were named by Gross, who established the inequalities in dimension-independent form, a key feature especially in the context of applications to infinite-dimensional settings such as for quantum field theories. Gross's logarithmic Sobolev inequalities proved to be of great significance well beyond their original intended scope of application, for example in the proof of the Poincaré conjecture by Grigori Perelman. [13] [14]
Gross has done important work in the study of loop groups, for example proving the Gross ergodicity theorem for the pinned Wiener measure under the action of the smooth loop group. [15] This result led to the construction of a Fock-space decomposition for the -space of functions on a compact Lie group with respect to a heat kernel measure. This decomposition has then led to many other developments in the study of harmonic analysis on Lie groups in which the Gaussian measure on Euclidean space is replaced by a heat kernel measure. [16] [17]
Yang–Mills theory has been another focus of Gross's works. Since 2013, Gross and Nelia Charalambous have made a deep study of the Yang–Mills heat equation [18] and related questions.
Gross was a Guggenheim Fellow in 1974–1975. [19] He was elected to the American Academy of Arts and Sciences [20] in 2004 and named a Fellow of the American Mathematical Society in the inaugural class of 2013. [21] He was recipient of the Humboldt Prize in 1996. [22]
Terence Chi-Shen Tao is an Australian mathematician who is a professor of mathematics at the University of California, Los Angeles (UCLA), where he holds the James and Carol Collins Chair in the College of Letters and Sciences. His research includes topics in harmonic analysis, partial differential equations, algebraic combinatorics, arithmetic combinatorics, geometric combinatorics, probability theory, compressed sensing and analytic number theory.
In mathematics and mathematical physics, potential theory is the study of harmonic functions.
In mathematics, there is in mathematical analysis a class of Sobolev inequalities, relating norms including those of Sobolev spaces. These are used to prove the Sobolev embedding theorem, giving inclusions between certain Sobolev spaces, and the Rellich–Kondrachov theorem showing that under slightly stronger conditions some Sobolev spaces are compactly embedded in others. They are named after Sergei Lvovich Sobolev.
The concept of an abstract Wiener space is a mathematical construction developed by Leonard Gross to understand the structure of Gaussian measures on infinite-dimensional spaces. The construction emphasizes the fundamental role played by the Cameron–Martin space. The classical Wiener space is the prototypical example.
An infinite-dimensional Lebesgue measure is a type of measure defined on an infinite-dimensional Banach space. It has properties similar to the Lebesgue measure that is defined on finite-dimensional spaces.
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Maria (Masha) Gordina is a Russian-American mathematician. She is a professor of mathematics at the University of Connecticut. Her research is at the interface between stochastic analysis, differential geometry, and functional analysis, including the study of heat kernels on infinite-dimensional groups.
In mathematics, logarithmic Sobolev inequalities are a class of inequalities involving the norm of a function f, its logarithm, and its gradient . These inequalities were discovered and named by Leonard Gross, who established them in dimension-independent form, in the context of constructive quantum field theory. Similar results were discovered by other mathematicians before and many variations on such inequalities are known.
In mathematical physics, two-dimensional Yang–Mills theory is the special case of Yang–Mills theory in which the dimension of spacetime is taken to be two. This special case allows for a rigorously defined Yang–Mills measure, meaning that the (Euclidean) path integral can be interpreted as a measure on the set of connections modulo gauge transformations. This situation contrasts with the four-dimensional case, where a rigorous construction of the theory as a measure is currently unknown.
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Hui-Hsiung Kuo is a Taiwanese-American mathematician, author, and academic. He is Nicholson Professor Emeritus at Louisiana State University and one of the founders of the field of white noise analysis.