MAN774 Perturbation Methods
Problem Solving Task 4
Due: 3pm Friday 25 May 2012 (end of Week 12)
(Was initially supposed to be 3pm Friday 18 May 2012 (end of Week 11))
Submit: Hand it to Scott McCue personally, or place it under his office door, O505.
Weighting: 8%
Instructions: Answer the following questions. Show all your working.
Submit your working in (neat) handwritten form (do not type up your solutions).
It is OK to discuss these questions with other students, but the written version of this Problem Solv-
ing Task must be your own. It is not OK to copy another student’s work.
Consider the integral
I
where the notation
R
¥id
0id
2
(s; e) = lim
d!0
+
Z
¥id
0id
iz e
z(1is)/e
2(1 z
2
)
dz,
means a contour that is parallel to the real z axis, but moved down by a
distance d.
Use the method of steepest descents to derive the full asymptotic expansion of I
in the limit e ! 0.
You will have to treat the cases s > 0 and s < 0 separately, although much of the working is the
same for each.
CRICOS No. 00213J 1
2
SOLUTION
Solution
(1)
LF25
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