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International Conference on Monte Carlo techniques
Closing conference of thematic cycle
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International Conference on Monte Carlo techniques
Closing conference of thematic cycle
Paris July 5-8th 2016
Campus les cordeliers
Jere Koskela's slides
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Existence of Solutions of Fractional Neutral Integrodifferential Equations wi...inventionjournals
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MA 243 Calculus III Fall 2015 Dr. E. JacobsAssignmentsTh.docxinfantsuk
MA 243 Calculus III Fall 2015 Dr. E. Jacobs
Assignments
These assignments are keyed to Edition 7E of James Stewart’s “Calculus” (Early Transcendentals)
Assignment 1. Spheres and Other Surfaces
Read 12.1 - 12.2 and 12.6
You should be able to do the following problems:
Section 12.1/Problems 11 - 18, 20 - 22 Section 12.6/Problems 1 - 48
Hand in the following problems:
1. The following equation describes a sphere. Find the radius and the coordinates of the center.
x2 + y2 + z2 = 2(x + y + z) + 1
2. A particular sphere with center (−3, 2, 2) is tangent to both the xy-plane and the xz-plane.
It intersects the xy-plane at the point (−3, 2, 0). Find the equation of this sphere.
3. Suppose (0, 0, 0) and (0, 0, −4) are the endpoints of the diameter of a sphere. Find the
equation of this sphere.
4. Find the equation of the sphere centered around (0, 0, 4) if the sphere passes through the
origin.
5. Describe the graph of the given equation in geometric terms, using plain, clear language:
z =
√
1 − x2 − y2
Sketch each of the following surfaces
6. z = 2 − 2
√
x2 + y2
7. z = 1 − y2
8. z = 4 − x − y
9. z = 4 − x2 − y2
10. x2 + z2 = 16
Assignment 2. Dot and Cross Products
Read 12.3 and 12.4
You should be able to do the following problems:
Section 12.3/Problems 1 - 28 Section 12.4/Problems 1 - 32
Hand in the following problems:
1. Let u⃗ =
⟨
0, 1
2
,
√
3
2
⟩
and v⃗ =
⟨√
2,
√
3
2
, 1
2
⟩
a) Find the dot product b) Find the cross product
2. Let u⃗ = j⃗ + k⃗ and v⃗ = i⃗ +
√
2 j⃗.
a) Calculate the length of the projection of v⃗ in the u⃗ direction.
b) Calculate the cosine of the angle between u⃗ and v⃗
3. Consider the parallelogram with the following vertices:
(0, 0, 0) (0, 1, 1) (1, 0, 2) (1, 1, 3)
a) Find a vector perpendicular to this parallelogram.
b) Use vector methods to find the area of this parallelogram.
4. Use the dot product to find the cosine of the angle between the diagonal of a cube and one of
its edges.
5. Let L be the line that passes through the points (0, −
√
3 , −1) and (0,
√
3 , 1). Let θ be the
angle between L and the vector u⃗ = 1√
2
⟨0, 1, 1⟩. Calculate θ (to the nearest degree).
Assignment 3. Lines and Planes
Read 12.5
You should be able to do the following problems:
Section 12.5/Problems 1 - 58
Hand in the following problems:
1a. Find the equation of the line that passes through (0, 0, 1) and (1, 0, 2).
b. Find the equation of the plane that passes through (1, 0, 0) and is perpendicular to the line in
part (a).
2. The following equation describes a straight line:
r⃗(t) = ⟨1, 1, 0⟩ + t⟨0, 2, 1⟩
a. Find the angle between the given line and the vector u⃗ = ⟨1, −1, 2⟩.
b. Find the equation of the plane that passes through the point (0, 0, 4) and is perpendicular to
the given line.
3. The following two lines intersect at the point (1, 4, 4)
r⃗ = ⟨1, 4, 4⟩ + t⟨0, 1, 0⟩ r⃗ = ⟨1, 4, 4⟩ + t⟨3, 5, 4⟩
a. Find the angle between the two lines.
b. Find the equation of the plane that contains every point o ...
Random Matrix Theory and Machine Learning - Part 3Fabian Pedregosa
ICML 2021 tutorial on random matrix theory and machine learning.
Part 3 covers: 1. Motivation: Average-case versus worst-case in high dimensions 2. Algorithm halting times (runtimes) 3. Outlook
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Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
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Model Attribute Check Company Auto PropertyCeline George
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Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
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This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
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The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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TESDA TM1 REVIEWER FOR NATIONAL ASSESSMENT WRITTEN AND ORAL QUESTIONS WITH A...
Statistical Physics Assignment Help
1. Statistical Physics Assignment Help
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2. d x
Statistical Physics
Problems
Problem 1: Doping a Semiconductor
p(x)
0.2
0 l
After diffusing impurities into a particular semiconductor the probability density p(x) for finding a
given impurity a distance x below the surface is given by
p(x) = (0.8/l) exp[−x/l] + 0.2 δ(x − d)
= 0
x ≥ 0
x < 0
where l and d are parameters with the units of distance. The delta function arises because a
fraction of the impurities become trapped on an accidental grain boundary a distance d below the
surface.
a) Make a carefully labeled sketch of the cumulative function P (x) which displays all of its
important features. [You do not need to give an analytic expression for P (x).]
b) Find < x >.
c) Find the variance of x, Var(x) ≡ < ( x − < x >)2 >.
The contribution to the microwave surface impedance due to an impurity decreases expo nentially
with its distance below the surface as e(−x/s). The parameter s, the “skin depth”, has the units of
distance.
d) Find < e(−x/s) >.
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3. x
Problem 2: A Peculiar Probability Density
p(x)
&/b2
0
Consider the following probability density.
a
p(x) =
b2 + x2
The functional form is variously called a Lorentzian or a Cauchy density. In physics, many spectral
lines associated with resonance phenomena can be approximated by this function where x is
replaced by a radian, ω, or circular, ν, frequency.
a) Use normalization to find a as a function of b.
b) Find the cumulative function P (x) and sketch the result.
c) Find < x >.
d) Find the values at which the density falls to one half of its maximum value, its half- width at
half-height.
e) What happens to < x2 > and Var(x) for this density?
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4. Problem 3: Visualizing the Probability Density for a Classical Harmonic Oscillator
Take a pencil about 1/3 of the way along its length and insert it between your index and middle
fingers, between the first and second knuckles from the end. By moving those fingers up and
down in opposition you should be able to set the pencil into rapid oscillation between two extreme
angles. Hold your hand at arms length and observe the visual effect. We will examine this effect.
Consider a particle undergoing simple harmonic motion, x = x0 sin(ωt + φ), where the phase φ is
completely unknown. The amount of time this particle spends between x and x + dx is inversely
proportional to the magnitude of its velocity (its speed) at x. If one thinks in terms of an ensemble
of similarly prepared oscillators, one comes to the conclusion that the probability density for
finding an oscillator at x, p(x), is proportional to the time a given oscillator spends near x.
a) Find the speed at x as a function of x, ω, and the fixed maximum displacement x0.
b) Find p(x). [Hint: Use normalization to find the constant of proportionality.]
c) Sketch p(x). What are the most probable values of x? What is the least probable? What is
the mean (no computation!)? Are these results consistent with the visual effect you saw with
the oscillating pencil?
Problem 4: Quantized Angular Momentum
In a certain quantum mechanical system the x component of the angular momentum, Lx, is
quantized and can take on only the three values −I, 0, or I. For a given state of the system
1 2 2 2
it is known that < Lx > = I and < L > = I . [I is a constant with units of angular
x
3 3
momentum. No knowledge of quantum mechanics is necessary to do this problem.]
a) Find the probability density for the x component of the angular momentum, p(Lx). Sketch the
result.
b) Draw a carefully labeled sketch of the cumulative function, P (Lx).
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5. Problem 5: A Coherent State of a Quantum Harmonic Oscillator
In quantum mechanics, the probability density for finding a particle at a position krat time
t is given by the squared magnitude of the time dependent wavefunction Ψ(kr, t):
p(kr, t) = |Ψ(kr, t)|2
= Ψ∗(kr, t)Ψ(kr, t).
Consider a particle moving in one dimension and having the wavefunction given below [yes, it
corresponds to an actual system; no, it is not indicative of the simple wavefunctions you will
encounter in 8.04]. 0
iωt i x − 2αx cos ωt
0
2 −1/4
Ψ(x, t) = (2πx ) exp − − 0 0
2 2
(2αxx sin ωt − α x sin 2ωt) − ( ) 2
0
2 (2x )2 2x 0
x0 is a characteristic distance and α is a dimensionless constant.
a) Find the expression for p(x, t).
b) Find expressions for the mean and the variance [Think; don’t calculate].
4 2 4
c) Explain in a few words the behavior of p(x, t). Sketch p(x, t) at t = 0, 1 T, 1 T, 3 T ,
and T where T ≡ 2π/ω.
Problem 6: Bose-Einstein Statistics
You learned in 8.03 that the electro-magnetic field in a cavity can be decomposed (a 3 dimensional
Fourier series) into a countably infinite number of modes, each with its own wavevector kk and
polarization direction k
�
. You will learn in quantum mechanics that the energy in each mode is
quantized in units of Iω where ω = c|kk|. Each unit of energy is called a photon and one says that
there are n photons in a given mode. Later in the course we will be able to derive the result that,
in thermal equilibrium, the probability that a given mode will have n photons is
n
p(n) = (1 − a)a n = 0, 1, 2, · · ·
where a < 1 is a dimensionless constant which depends on ω and the temperature T . This is
called a Bose-Einstein density by physicists; mathematicians, who recognize that it is applicable
to other situations as well, refer to it as a geometric density. n
a) Find < n > . [Hint: Take the derivative of the normalization sum, a
n
, with respect
to a.]
b) Find the variance and express your result in terms of < n >. [Hint: Now take the
n n
derivative of the sum involved in computing the mean, na .] For a given mean,
the Bose-Einstein density has a variance which is larger than that of the Poisson by a
factor. What is that factor?
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6. c) Express p(x) as an envelope function times a train of δ functions of unit area located at the
non-negative integers. Show that the envelope decreases exponentially, that is,
as e−x/φ. Express φ in terms of < n > and show that in the limit of large < n >,
φ →< n >.
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7. Solution
Problem 1: Doping a Semiconductor
a) Mentally integrate the function p(x) given in the figure. The result rises from zero at a
decreasing rate, jumps discontinuously by 0.2 at x = d, then continues to rise asymptotically
toward the value 1. This behavior is sketched below.
P(x)
1
0.2
x
d
0
b)
< x > =
∫ ∞
0.8
l
∞
x p ( x ) dx =
∫ ∞
x exp( −x/l) dx + 0.2
− ∞
s 0
∫
˛
l2
¸ x 0
xδ(x − d) dx
s ˛
d
¸ x
= 0.8 l + 0.2 d
c)
∞
< x2
> =
∞
0.8
l
∞
∫
2
x p(x) dx =
∫
2
∫
2
− ∞ 0 0
x exp(
s
2
˛
l
¸
3
−x/l) dx + 0.2
x s
x δ(x − d) dx
d
˛ ¸
2
x
= 1.6 l2
+ 0.2 d2
Var(x )
2 2 2
≡ < (x− < x > ) > = < x > − < x >
= (1.6 l2
+ 0.2 d2
) − (0.64 l2
+ 0.32 ld + 0.04 d2
)
= 0.96 l2
− 0.32 ld − 0.16 d2
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8. d)
< exp(−x/s) > =
∫ ∞
exp(−x/s) p(x) dx
− ∞
0.8
l
=
∫ ∞ ∞
exp(−x/s) exp(−x/l) dx + 0.2
∫
s 0
(1/s +
˛¸
1/l)−1
x 0
s
exp(−x/s)δ(x − d) dx
exp(
˛
−
¸
d/s)
x
=
0.8
. Σ
+ 0.2 exp(−d/s)
1 + l/s
Check to see that this result is physically reasonable. Note that if the skin depth s is much less
than the distance d, the impurities on the grain boundary do not contribute to the surface
impedance. Similarly, if the skin depth is much less than the characteristic diffusion distance l, the
impurity contribution to the surface impedance is greatly reduced.
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9. Problem 2: A Peculiar Probability Density
a)
1 =
∫ ∞
p(x) dx = 2
∫
∞ a
dx
b2 + x2
− ∞ 0
2a
b
=
∫
1
∞
dξ = (πa/b)
s 0 1 + ξ2
π
˛
/
¸
2
a = (b/π)
x
b)
P (x) =
∫ x b
π
j j
p(x ) dx = j
∫ x
1 dx
b2 + xj2
− ∞ − ∞
b
π
=
Σx
1
arctan(xj
/b)
− ∞ b
1 1
= arctan(x/b) +
π 2
x
0
P(x)
1.0
0.5
-2b 2b
c) < x > = 0 by symmetry. p(x) is an even function and x is odd.
d) p(x) falls to half its value at x = ±b.
e) 2 b
∫ ∞
x2
b2 + x2 dx
< x > =
π − ∞
However the limit of x2/(b2 + x2 ) as x → ± ∞ is unity, so this integral diverges. Neither
the mean square nor the Variance of this distribution exist.
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10. Problem 3: Visualizing the Probability Density for a Classical Harmonic Oscillator
a) First find the velocity as a function of time by taking the derivative of the displacement with
respect to time.
d
x˙(t) = [x0 sin(ωt + φ)]
dt
= ωx0 cos(ωt + φ)
But we don’t want the velocity as a function of t, we want it as a function of the position
x. And, we don’t actually need the velocity itself, we want the speed (the magnitude of the
velocity). Because of this we do not have to worry about losing the sign of the velocity when we
work with its square.
x˙2
(t) = (ωx0 )2
cos2
(ωt + φ)
= (ωx0)2
[1 − sin2
(ωt + φ)]
= (ωx0)2
[1 −(x(t)/x0 )2
]
Finally, the speed is computed as the square root of the square of the velocity.
0
|x˙(t)| = ω(x − x (t))
2 2 1/2
for |x(t)| ≤ x0
b) We are told that the probability density for finding an oscillator at x is proportional to the the
time a given oscillator spends near x, and that this time is inversely proportional to its speed at
that point. Expressed mathematically this becomes
p(x) ∝ |x˙(t)|−1
0
= C(x − x )
2 2 −1/2
for |x| < x0
where C is a proportionality constant which we can find by normalizing p(x).
∞ x 0
p(x)dx = 0
2 2 −1/2
C (x − x ) dx
∫ ∫
− ∞ −x0
= 2C
= 2C
∫ x 0
dx/x 0
let x/x0 ≡ y
2
√
∫
0 0
1 − (x/x )
1
dy
0
√
1 − y2
s x
π
˛
/
¸
2
= πC
= 1 by normalization
The last two lines imply that C = 1/π. We can now write (and plot) the final result.
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11. p(x) =
.
π x 0
√
1 −(x/x0 )2
Σ−
1
= 0
|x| < x0
|x| > x0
As a check of the result, note that the area of the shaded rectangle is equal to 2/π. The area is
dimensionless, as it should be, and is a reasonable fraction of the anticipated total area under
p(x), that is 1.
c) The sketch of p(x) is shown above. By inspection the most probable value of x is ±x0 and the
least probable accessible value of x is zero. The mean value of x is zero by symmetry. It is the
divergence of p(x) at the turning points that gives rise to the apparent image of the pencil at
these points in your experiment.
COMMENTS If an oscillator oscillates back and forth with some fixed frequency, why is this p(x)
independent of time? The reason is that we did not know the starting time (or equivalently the
phase φ) so we used an approach which effectively averaged over all possible starting times. This
washed out the time dependence and left a time-independent probability. If we had known the
phase, or equivalently the position and velocity at some given time, then the process would have
been deterministic. In that case p(x) would be a delta function centered at a value of x which
oscillated back and forth between −x0 and +x0 .
Those of you who have already had a course in quantum mechanics may want to compare the
classical result you found above with the result for a quantum harmonic oscillator in an energy
eigenstate with a high value of the quantum number n and the same total energy. Will this
probability be time dependent? No. Recall why the energy eigenstates of a potential are also
called “stationary states”.
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12. Problem 4: Quantized Angular Momentum
a) Using the expression for the normalization of a probability density, along with expres- sions for
the mean and the mean square, we can write three separate equations relating the individual
probabilities.
p(−k) + p(0) + p(k)
−k p(−k) + 0 × p(0) + k p(k)
k2
p(−k) + 0 × p(0) + k2
p(k)
1
= 1
= < Lx > =
3
k
= < L2
> =
2
k2
x
3
We now have three simple linear equations in three unknowns. The last two can be simplified and
solved for two of our unknowns.
−p(−k) + p(k) = 1
3
p(k) = 1
2
⇒
p(−k) + p(k) = 2
3 p(−k) = 1
6
Substitute these results into the first equation to find the last unknown.
1 1 1
+ p(0) + = 1 ⇒ p(0) =
6 2 3
b)
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13. Problem 5: A Coherent State of a Quantum Harmonic Oscillator
2 −1/4
Σ
iωt i
0
Ψ(ṙ, t) = (2πx ) exp − − 0
0
2 2
0
0
(2αxx sin ωt − α x sin 2ωt) − (
x − 2αx cos ωt
) 2
2 (2x )2 2x 0
Σ
a) First note that the given wavefunction has the form Ψ = a exp[ib + c] = a exp[ib] exp[c] where
a, b and c are real. Thus the square of the magnitude of the wavefunction is simply a2 exp[2c] and
finding the probability density is not algebraically difficult.
2 1 (x − 2αx0 cos ωt)2
p(x, t) = |Ψ(x, t)| = √ exp[− ]
2πx 2x2
2
0 0
b) By inspection we see that this is a Gaussian with a time dependent mean
< x > = 2αx0 cos ωt and a time independent standard deviation σ = x0.
c)p(x, t) involves a time independent pulse shape, a Gaussian, whose center oscillates har-
monically between −2αx0 and 2αx0 with radian frequency ω.
2x0 x
-2x0 0
t= 1/2 T t= 3/4 T
t= 1/4 T t=0
Those already familiar with quantum mechanics will recognize this as a “coherent state” of the
harmonic oscillator, a state whose behavior is closest to the classical behavior. It is not an energy
eigenstate since p(x) depends on t. It should be compared with a classical harmonic oscillator
with known phase φ and the same maximum excursion: x = 2αx0 cos ωt.
In this deterministic classical case p(x, t) is given by
p(x, t) = δ(x − 2αx0 cos ωt).
The coherent state is a good representation of the quantum behavior of the electromagnetic field
of a laser well above the threshold for oscillation.
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14. Problem 6: Bose-Einstein Statistics
We are given the discrete probability density n
p(n) = (1 − a)a n = 0, 1, 2, ···
a) First we find the mean of n.
∞ ∞
Σ Σ
< n > = np(n) = (1 − a) na
n= 0 n= 0
n
s ˛
S
¸
1
x
The sum S1 can be found by manipulating the normalization sum.
∞ ∞
Σ Σ ∞
n=0 n=0 n=0
Rearranging the last two terms gives the sum of a geometric series:
Σ
n n
p(n) = (1 − a)a = (1 − a) a must = 1
Σ∞
n
a = .
1
1 −a
n= 0
But note what happens when we take the derivative of this result with respect to the pa- rameter
a.
d
da
Σ∞ ∞
1
a
1
Σ
n n− 1
a = na =
∞
Σ n
na = S 1
a
n=0
also =
n= 0
d 1
da 1 − a
. Σ
=
n=0
1
(1 −a)2
Equating the two results gives the value of the sum we need, S1 = a/(1 − a)2, and allows us to
finish the computation of the mean of n:
a
< n > = .
1 − a
c) To find the variance we first need the mean of the square of n.
∞ ∞
Σ Σ
< n > = n p(n) = (1 − a) n a
2 2 2 n
n= 0 n= 0
s ˛
S
¸
2
x
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15. Now try the same trick used above, but on the sum S1.
d
da
∞ ∞
Σ Σ
n 2 n−1
na = n a =
∞
1
a
1
2 n
n a = S 2
s ˛¸ x
Σ
a
n= 0 n= 0 n= 0
S 1
d a 2a 1
also =
. Σ
Then
= +
da (1 − a)2 (1 − a)3 (1 −a)2
2
Σ 2a2 a
< n > = (1 − a)
(1 − a)3 +
(1 − a)2 = 2
a 2
+
1 − a
Σ . Σ . a
1 −a
Σ
= 2 < n >2
+ < n >,
and
Variance = < n2
> − < n > 2
= < n >2
+ < n >
= < n > (1+ < n >).
This is greater than the variance for a Poisson, < n >, by a factor 1+ < n > . c)
Σ∞
p(x) =
n= 0
n
(1 − a)a δ(x − n)
∞
Σ
= f (x) δ(x − n)
n= 0
Try f (x) = Ce−x/φ
,
then f (x = n) = Ce−n/φ
= C(e−1/φ
)n
= (1 − a)an
.
This tells us that C = 1 − a and exp(−1/φ) = a. We can invert the expression found above for < n
> to give a as a function of < n >: a = < n > /(1+ < n >).
< n >
−1/φ = ln a = ln
1+ < n >
. Σ
1
< n >
1/φ = ln < n > +1
< n >
= ln 1 +
. Σ . Σ
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16. Recall that for small x one has the expansion ln(1 + x) = x − x2/2 + . . .. Therefore in the limit <
n > > > 1, 1/φ → 1/ < n > which implies φ → < n > .
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