Interesting integral involving modulus of difference of vectors, how to solve?

Click For Summary
SUMMARY

The discussion focuses on solving the integral \(\int\int e^{-\alpha(|\vec{r}_1-\vec{r}_2|-r_0)^2} d^3\vec{r}_1 d^3\vec{r}_2\) where \(\alpha > 0\). Participants suggest approximating the integral or simplifying it by considering a one-dimensional case with \(\int\int e^{-\alpha (|x-y|-a)^{2}}dxdy\). The discussion emphasizes the importance of understanding the modulus of the difference between vectors in the context of multidimensional integrals.

PREREQUISITES
  • Understanding of vector calculus
  • Familiarity with multivariable integrals
  • Knowledge of exponential functions and their properties
  • Basic concepts of approximation techniques in calculus
NEXT STEPS
  • Research techniques for evaluating multidimensional integrals
  • Explore methods for approximating integrals involving exponential functions
  • Learn about the properties of the modulus function in vector spaces
  • Study Gaussian integrals and their applications in physics
USEFUL FOR

Students and researchers in mathematics, physics, or engineering who are tackling complex integrals involving vector differences and exponential decay functions.

omg!
Messages
50
Reaction score
0
Hi guys,

Homework Statement


how do i solve (or approximate if not solvable) this integral

\int\int e^{-\alpha(|\vec{r}_1-\vec{r}_2|-r_0)^2} d^3\vec{r}_1 d^3\vec{r}_2

\alpha>0

Homework Equations


none

The Attempt at a Solution


none
 
Physics news on Phys.org
Compute:
<br /> |r_{1}-r_{2}|^{2}=(r_{1}-r_{2}).(r_{1}-r_{2})<br />
What do you get? Or take an easier example, can you compute:
<br /> \int\int e^{-\alpha (|x-y|-a)^{2}}dxdy<br />
 

Similar threads

  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
Replies
3
Views
2K
Replies
9
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
Replies
6
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K