Computational Aspects of Modular Forms and Galois Representations

Idioma: inglés

Editorial: Princeton University Press, US, 2011

0691142025 / 9780691142029

Serie: Libro 28 de 202 - Annals of Mathematics Studies

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Modular forms are tremendously important in various areas of mathematics, from number theory and algebraic geometry to combinatorics and lattices. Their Fourier coefficients, with Ramanujan's tau-function as a typical example, have deep arithmetic significance. Prior to this book, the fastest known algorithms for computing these Fourier coefficients took exponential time, except in some special cases. The case of elliptic curves (Schoof's algorithm) was at the birth of elliptic curve cryptography around 1985. This book gives an algorithm for computing coefficients of modular forms of level one in polynomial time. For example, Ramanujan's tau of a prime number p can be computed in time bounded by a fixed power of the logarithm of p. Such fast computation of Fourier coefficients is itself based on the main result of the book: the computation, in polynomial time, of Galois representations over finite fields attached to modular forms by the Langlands program. Because these Galois representations typically have a nonsolvable image, this result is a major step forward from explicit class field theory, and it could be described as the start of the explicit Langlands program.The computation of the Galois representations uses their realization, following Shimura and Deligne, in the torsion subgroup of Jacobian varieties of modular curves. The main challenge is then to perform the necessary computations in time polynomial in the dimension of these highly nonlinear algebraic varieties. Exact computations involving systems of polynomial equations in many variables take exponential time. This is avoided by numerical approximations with a precision that suffices to derive exact results from them. Bounds for the required precision--in other words, bounds for the height of the rational numbers that describe the Galois representation to be computed--are obtained from Arakelov theory. Two types of approximations are treated: one using complex uniformization and another one using geometry over finite fields. The book begins with a concise and concrete introduction that makes its accessible to readers without an extensive background in arithmetic geometry. And the book includes a chapter that describes actual computations.…

N° de ref. del artículo LU-9780691142029

Título
Computational Aspects of Modular Forms and Galois Representations
Autor
Bas Edixhoven
Editorial
Princeton University Press, US
Año de publicación
2011
Estado
New
Encuadernación
Paperback
Idioma
inglés
ISBN 10
0691142025
ISBN 13
9780691142029
Peso del artículo
595 gramos
Serie
Libro 28 de 202: Annals of Mathematics Studies

Rarewaves.com USA

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