Talk:PHZ3400-09 Emergence in Condensed Matter

Notes

Figure we should add a bit more to the formula bit. I'll put a bit more later under the section I added. (Peter)

Here are my notes from class:
"Macroscopic" Avogadro's Number = 10^23
Gets very complicated to e^10^23
Napoleon had all of his men calculate the first 100 logarithms in shooting the enemy
Center of mass Rm = Sigma m1R1 /Sigma m1
Use a few degrees of freedom to determine the Center of Mass
It's a simple parabola as opposed to a collection of wiggling atoms.
We're concerned about the big picture
Another example: corse graining -> Lattice of atoms -> Elastic Medium
Think oceans: looks smooth from above, even during a storm
Microscopic -> Corse Graining -> Effective macroscopic
LIST OF MIRACLES
Bar Magnet
Susceptibility x = dM(t) / dH
T >> Tc: x(t) = H / (T - theta)
T >= Tc: x(t) = Tr - T^(-gamma)
2nd order phase transition
gamma = critical exponent = 1.3
"Universality" = gamma is the same for large classes of materials
Thermal motion usually drives you though a phase transition
But also quantum phase transitions
Zero point energy comes from the uncertainty principle
It describes how things move at absolute zero
Rumpelstilskin stomped on the floor and eventually fell through it
Frustrated students bang head against wall
Why do objects have solidity?
Not crystalized structure - i.e. windows
You cannot make the orbit of an atom smaller - why?
1) Uncertainty
2) Pauli Exclusion / Fermi Dirac Statistics
Without Quantum Mechanics...
They couldn't explain stability of atomic matter
Why doesn't everything spiral to the center of an atom?
Another puzzle/miracle:
Crystal consists of electrons that don't seem to bounce at certain temperatures
KimberlyWynne 03:32, 23 January 2009 (EST)

Editing Wikipedia

Not quite sure how this is supposed to work, but how do we create links on words in the article like real wikipedia does. For example linking the wiki pages of the exclusion principle and uncertainty principle from the place they are used in the notes. (Chris)

Not entirely sure. Never edited wiki before. (Peter)

Good work guys! I like it when you discuss the course work on-line, and I'll assign credit for it. This is sort of like our own BLOG!! (Vlad)

Note to Newbies: Sign your name with 4 tildes(~). Here's some information about links:

[[PHZ3400-09 Modern Physics]] = PHZ3400-09 Modern Physics

[[PHZ3400-09 Modern Physics|Modern Physics]] = Modern Physics

[[PHZ3400-09 Modern Physics#Atomic Shell Structure|Pauli Exclusion Principle]] = Pauli Exclusion Principle

(KimberlyWynne 03:16, 23 January 2009 (EST))