Thermal Physics: Understanding Heat and Energy Transfer

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SUMMARY

This discussion focuses on calculating the integral \(\int x^{2n} N(x) dx\) in the context of thermal physics, specifically using integration techniques. Participants suggest employing integration by parts and induction to derive a general solution for the integral. Additionally, a more straightforward method is proposed, utilizing the relationship \(\int x^{2n} e^{-\alpha x^2} dx = (-1)^n \int \frac{\partial^{n}}{\partial \alpha^{n}} e^{-\alpha x^2} dx\) to leverage known results from Gaussian integrals.

PREREQUISITES
  • Understanding of integration techniques, specifically integration by parts.
  • Familiarity with Gaussian integrals and their properties.
  • Basic knowledge of induction in mathematical proofs.
  • Concept of moments in statistical mechanics.
NEXT STEPS
  • Study the method of integration by parts in detail.
  • Research Gaussian integrals and their applications in thermal physics.
  • Explore the concept of mathematical induction and its use in deriving formulas.
  • Learn about the moments of distributions and their significance in statistical mechanics.
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This discussion is beneficial for students and professionals in physics, particularly those focusing on thermal physics, mathematical methods in physics, and statistical mechanics.

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it's asking you to calculate

\int x^{2n} \textit{N}(x) dx
 
sgd37 said:
it's asking you to calculate

\int x^{2n} \textit{N}(x) dx

Using induction? It looks like I can solve that integral with integration by parts.
 
I suppose the inductive part comes from solving for the first few n and then coming up with a general n dependent solution. So yeah use integration by parts to find the first few moments. One can use the simpler method of observing that \int x^{2n}e^{-\alpha x^2} dx = (-1)^n \int \frac{\partial^{n}}{\partial \alpha^{n}} e^{-\alpha x^2} dx and then using the standard results of a gaussian integral
 

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