Integral in Stefan-Boltzmann law

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SUMMARY

The discussion centers on the analytical solution of the integral involved in the Stefan-Boltzmann law, specifically the integral \(\int_0^\infty \frac{x^n}{(e^x-1)^m}dx\). Participants highlight that this integral does not have a straightforward analytical solution. They discuss alternative approaches, such as using Taylor expansion and contour integration to solve related integrals like \(\int_0^\infty \frac{\sin(kx)}{e^x-1}dx\). Additionally, generating functions and their derivatives are mentioned as methods to derive connections to the Riemann zeta function and Gamma function.

PREREQUISITES
  • Understanding of integral calculus, particularly improper integrals.
  • Familiarity with the Stefan-Boltzmann law and its applications in physics.
  • Knowledge of Taylor series expansions and contour integration techniques.
  • Basic concepts of special functions, including the Riemann zeta function and Gamma function.
NEXT STEPS
  • Research the properties and applications of the Riemann zeta function.
  • Study contour integration methods in complex analysis.
  • Explore generating functions and their role in solving integrals.
  • Read about the analytical techniques used in deriving the Stefan-Boltzmann law.
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Students and researchers in physics and mathematics, particularly those interested in thermodynamics, integral calculus, and special functions related to the Stefan-Boltzmann law.

dingo_d
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Hi!

I'm wondering if anybody can recommend me a book where it's explained how to solve (analytically) integral that appears in Stefan-Boltzmann's law:

\int_0^\infty \frac{x^n}{(e^x-1)^m}dx

Thanx!
 
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As far as I know it does not have an analytical solution.
 
Well you consider the integral:
\int_0^\infty \frac{\sin(kx)}{e^x-1}dx, we can use Taylor expansion on it and solve it via contour integration.

At my class we solved that by using some kind of generating function F(p)=\int_0^\infty x^n \ln(1-e^{p-x})dx, then derived it by p and evaluated at p=0. First we expanded logarithm in Taylor series, and we got Riemann zeta function and Gamma function.

But I was wondering if there are any books that show where this all comes from...
 

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