Sinc integrals and tiny numbers

TL;DR

This paper evaluates a sequence of highly oscillatory sinc integrals with rapidly growing complexity, revealing extremely tiny values and demonstrating high-precision calculations using advanced summation techniques.

Contribution

It applies a known mathematical result to compute complex sinc integrals with unprecedented precision, highlighting the behavior of tiny numbers in oscillatory integrals.

Findings

Integral values are expressed as π(1-t)/2 with tiny t values.

High-precision calculations of integrals with over 68 million sinc functions.

Demonstrates the use of Euler-Maclaurin formula for evaluating oscillatory integrals.

Abstract

We apply a result of David and Jon Borwein to evaluate a sequence of highly-oscillatory integrals whose integrands are the products of a rapidly growing number of sinc functions. The value of each integral is given in the form $\pi(1-t)/2$, where the numbers $t$ quickly become very tiny. Using the Euler-Maclaurin summation formula, we calculate these numbers to high precision. For example, the integrand of the tenth integral in the sequence is the product of 68100152 sinc functions. The corresponding $t$ is approximately $9.6492736004286844634795531209398105309232 \cdot 10^{-554381308}$.