Logistical details Introductory remarks: why you should care about this. What is statistical and thermal physics? Structure and grading Honor code issues Course outline References Resources on the web SCHEDULE!

If you have a documented disability that will impact your
work in this class, please contact me to discuss your needs.
Additionally, you will need to register with the Disability
Support Services Office in the Ley Student Center.

*Learning statistical and thermal physics is challenging, and so is
teaching it*. This subject is vast, the concepts are new, and,
like quantum mechanics, fluency in statistical physics requires an intuition
all its own. Also like quantum mechanics, there are many problems
that are easy to state and extremely difficult to solve exactly.
In this course you'll gain experience with approximations and models, and
learn about their regimes of validity. I often refer to this kind
of reasoning as "thinking like a physicist". The only way to really
get an understanding of this subject is to work *many problems* spanning
the concepts involved.

Because of the limited time available in a one-semester course, I can't cover everything I'd like. Also, traditional treatments such as the one in the official textbook (Reif) were typically written in the 1960's, and omit some of the most profound developments in this area in the last forty years. Therefore, rather than proceeding straight through Reif, I am going to present the subject in a different order, while augmenting the text with additional course materials from various sources as necessary. I want to make sure you get a solid grounding in the fundamentals of the field, while still having a chance to sample some of the more recent developments.

The course will be challenging. You'll be seeing lots of new concepts,
some familiar and some not, and we'll be moving at a good clip. Please
try and read the recommended material before class - it'll make your life
easier later. Similarly, don't delay on starting the problem sets.
You'll find them easier if you mull them over for a while rather than waiting
until the last minute.

Why do we need a statistical approach? You already know that general
interacting problems involving more than two particles seldom have exact
solutions. On the other hand, the air in this room (on the order
of 10^{24} particles) seems to be in a well-defined "equilibrium
state" that we're accustomed to characterizing by a small number of parameters
(temperature, pressure, volume). Despite the fact that we can't keep
track of the movements of each particle individually, we can still make
predictions about some sort of average behavior of the whole set of particles.
Further observations tell us that fluctuations away from the equilibrium
state seem to be unnoticeably small, despite the fact that there's nothing
in the microscopic laws obeyed by each particle to prevent all the gas
molecules from ending up in the upper half of the room at the same time.
Similarly, you know from experience that "heat energy" flows from hot objects
to cold objects spontaneously, and never the reverse. Statistical
and thermal physics aims to examine the properties of "large" systems,
and explain observations like those described above.

The machinery of statistical physics is extremely powerful because of its generality. The same formalism used to understand the classical ideal gas can be applied to understanding such highly quantum mechanical problems as electrons in metals, black body radiation, Bose-Einstein condensation, and the behavior of ferromagnets.

By the end of this course, you should be able to answer questions like:

- What is temperature, and why does energy flow from high temperature to low temperature bodies?
- What is the difference between heat and work?
- Why can't I cool my house by leaving the refrigerator door open?
- Why is the air thinner on top of Mt. Everest?
- Why do you asphyxiate if you breath too much carbon monoxide?
- Why are metals stable? Why don't white dwarf stars collapse? Why do gases of lithium-6 and lithium-7 behave very differently at low temperatures? (These three share a common answer.)
- Why does outer space glow like it has a temperature of 2.7 K?
- What is the Ising model? What do planar ferromagnets, superfluids, and liquid crystals have in common?

**Hurricane Ike disruption** - Hurricane Ike has disrupted the course schedule a bit. Problem Set 2 will be due Tuesday, September 23, 2008. Problem Sets 3 and 4 will be combined and compressed, and will be handed out Tuesday, September 23, due Thursday, October 2.

*Understanding* the material is at least as important as getting
a numerically or formulaically correct answer to the problem.
If your reasoning isn't obvious, please write little explanations of
what you're doing and why, so partial credit can be assigned in a reasonable
way.

Every week I will also hand out additional problems in addition to those
that make up the problem set. These problems will collectively be
known as the **question bank**, and will provide additional practice
for you as the semester progresses. You don't have to do these, and
solutions to them will not be handed out. However, I will tell you
that approximately 1/3 of the final exam will be problems from the question
bank. You probably don't want to leave all these for the end of the
semester....

The problem sets are not pledged. **I encourage you to discuss
the problem sets and question bank material with each other.**
You may give each other guidance and advice on problem solving approaches,
and you may compare solutions to check your work. However, you may
not copy solutions from another student, and the problem sets you submit
must be entirely your own work and your own words. If you used a
book, you must cite the relevant material. If you collaborated strongly
with other students, cite them as well - this is intellectual honesty.
Googling around to find solutions is unacceptable and (trust me) not worth the effort.

There will be two exams in the course. The overall grading will be:

40% homeworkThe takehome exams will be pledged open-notes (yours only!), open-

30% first exam (takehome, handed out Thu. October 2, due back Thu. October 9)

30% final exam (also takehome, scheduling TBA.)

I. Overview and introductionII. Probability and necessary mathematics

Probability, distributions, counting, partial derivativesIII. Basics of classical thermodynamicsStates, macroscopic vs. microscopic, "heat" and "work",IV. More classical thermodynamics

energy, entropy, equilibrium, laws of thermodynamicsEquations of state, thermodynamic potentials, temperature, pressure,V. Statistical mechanics - the formalism.

chemical potential, thermodynamic processes (engines, refrigerators),

Maxwell relations, phase equilibria.Counting states, ensembles (microcanonical, canonical, grand canonical),VI. Magnetic systems

the partition function and its applications, fluctuations from equilibrium,

equipartition.Paramagnetism, ferromagnetism, adiabatic cooling, susceptibility & correlations,VII. Gases

mean field theory, Ising model.Classical ideal gas (Maxwell distribution), Bose gas (mode-counting,VIII. Phase transitions

photons, phonons, BEC), Fermi gas (degeneracy pressure, heat capacity),

van der Waals and "real" gases.Landau theory, scaling, renormalization, solution to 1D IsingIX. TransportDiffusion, Brownian motion, Boltzmann equation.X. Special topicsArrow of time, fluctuation-dissipation theorem, nonequilibrium systems,

granular media, the density matrix

Other statistical and thermal physics texts:

H.C. Callen.To top of textThermodynamics and an Introduction to Thermostatistics, 2nd ed., Wiley. An excellent treatment of classical thermodynamics, though the statistical mechanics portion is tacked on.C. Kittel and H. Kroemer.

Thermal Physics, 2nd ed., Freeman. Another standard, this one more on the statistical physics side. It uses rather nonstandard notation in places, but has great problems.F. Mandl.

Statistical Physics, 2nd ed., Wiley. Pretty decent. Strong in thermodynamics. Needs more exercises.R. Baierlein.

Thermal Physics, Cambridge University. Haven't used it; supposed to be a decent undergrad book.D.V. Schroeder.

Introduction to Thermal Physics, Addison Wesley. I've looked through it; looks like a decent undergraduate book.D.A. McQuarrie.

Statistical Mechanics, University Science. Very good, though quite advanced. Looks at things more from the physical chemistry point of view.D.L. Goodstein.

States of Matter, Dover. Excellent, but somewhere between a stat mech and a solid state text. It's very readable, and a very good deal since it's a Dover book.L.D. Landau and E.M. Lifshitz.

Statistical Physics Part 1, 3rd ed., Pergamon. A classic. Very dense, borderline graduate level.R.P. Feynman.

Statistical Mechanics: a set of lectures, Addison Wesley. Another classic. Graduate level, good for understanding the density matrix.P.M. Chaikin and T.C. Lubensky.

Principles of Condensed Matter Physics. Cambridge University. Has very good chapters on phase transitions. Avail. in paperback, so it's not absurdly expensive.

The STP Project - A project helmed by two faculty members (Harvey Gould at Clark University and Jan Tobochnik at Kalamazoo College) to reform the teaching of statistical and thermal physics. Includes a draft textbook, and a very nice compendium of web resources.Good physics-related websiteshttp://lorax.chem.upenn.edu/Education/MB/ - A University of Pennsylvania physical chemistry look at the Maxwell-Boltzmann distribution, including applets..

http://csep10.phys.utk.edu/guidry/java/wien/wien.html - Some applets related to black body radiation.

http://history.hyperjeff.net/statmech.html - A statistical physics timeline, for history buffs.

http://www.cstl.nist.gov/div836/836.05/thermometry/home.htm - The thermometry research group at NIST, actively trying to improve our understanding and standards of temperature, particularly below 1 K.

http://comp.uark.edu/~jgeabana/mol_dyn/ - an applet that shows an example of macroscopic irreversibility from microscopically reversible laws of motion in the presence of infinitesmal perturbation.

http://www.physics.buffalo.edu/gonsalves/Java/Percolation.html - an applet that shows the percolation phase transition.

http://webphysics.davidson.edu/Applets/ising/intro.html - another applet, this one showing a numerical approach to the 2d ising model.

http://arxiv.org - Cornell e-print server - the latest hot results, but no peer review....

http://www.research.ibm.com/disciplines/physics.shtml - IBM Research - lots of neat topicsStatistics websiteshttp://jas2.eng.buffalo.edu/applets/index.html - Very cool java applets for solid state physics!

http://solidstate.physics.sunysb.edu/teach/intlearn/ - More and different java applets for solid state physics.

http://www.colorado.edu/physics/2000/index.pl - Another java-driven physics site, though at a lower level.

http://jersey.uoregon.edu/vlab/index.html - University of Oregon's "virtual lab", another collection of applets.

http://onlinestatbook.com/rvls.html - The Rice University virtual statistics laboratory. Very cool.

http://www.stat.sc.edu/~west/javahtml/LetsMakeaDeal.html - an applet for demonstrating the "Monty Hall" problem.http://www.stat.sc.edu/~west/javahtml/CLT.html - an applet by the same author for demonstrating the Central Limit Theorem.

http://www.math.uah.edu/stat/index.xhtml - a large number of statistics demo applets.