Welcome to Physics 5305 Statistical & Thermal Physics!

1. Welcome to Physics 5305Statistical & Thermal Physics!

2. Brief Overview of the Structure of Physics • Where does Statistical Physicsfit in to the overall organization (structure) of Physics? • What aboutThermodynamics? • How is Thermodynamicsrelated to Statistical Physics?

3. Sometimes, I’ll make • comments on • Physics History, • Famous Physicists& • Physics Trivia • (interesting to me!):

4. For example, what follows are Some interesting (to me!) facts about Some Nobel Prize winners! Niels Bohr 1922 Nobel Prize in Physics for “His services in the investigation of the structure of atoms & of the radiation emanating from them.”

5. Notice the Figure Caption! Niels Bohr 1922 Nobel Prize in Physics for “His services in the investigation of the structure of atoms & of the radiation emanating from them.”

6. Interesting (to me!) Trivia! Niels Bohr is the only Nobel Prize Winnerto have ALSO been an Olympic Medalist! • In the 1908 Olympics, • he & his brother Harald* • were on the Danish • soccer team, which won • a sliver medal! *Harald Bohr later became a famous mathematician!

7. More Interesting (to me!) Trivia! Neils Bohr’s son, Aage Bohr also received a Nobel Prize in Physics! He shared the 1975 Nobel Prize with B. Mottelson & J. Rainwater  “for the discovery of the connection between collective motion & particle motion in atomic nuclei & the development of the theory of the structure of the atomic nucleus based on this connection”.

8. More Interesting(to me!) Trivia! Other families with more than one Nobel Prize!

9. Radioactivity & the Curies, Part I First Woman Nobel Prize Winner! • In 1903, the husband & wife were jointly awarded the Nobel Prize in Physics “In recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena discovered by Professor Henri Becquerel” (Becquerel shared the prize with them) Pierre Curie (1859-1906) Marie (Skłodowska) Curie (1867-1934)

10. Radioactivity & the Curies, Part II Nobel Prize in 2 Different Sciences! • In 1911, Marie Curie was also awarded the Nobel Prize in Chemistry! “In recognition of her services to the advancement of chemistry by the discovery of the elements radium and polonium, by the isolation of radium and the study of the nature and compounds of this remarkable element".” Marie (Skłodowska) Curie (1867-1934)

11. Radioactivity & the Curies, Part II More Trivia! • Why didn’t Pierre Curie also share this Nobel in Chemistry Prize with Marie?

12. Radioactivity & the Curies, Part II More Trivia! • Why didn’t Pierre Curie also share this Nobel in Chemistry Prize with Marie? • Unfortunately & tragically, he was killed in an accident in 1906!

13. Radioactivity & the Curies, Part II More Trivia! • Why didn’t Pierre Curie also share this Nobel in Chemistry Prize with Marie? • Unfortunately & tragically, he was killed in an accident in 1906! Nobel’s will does not allow a Nobel Prize to be awarded to a deceased person!

14. Radioactivity & the Curies, Part III Marie & Pierre’s daughter! • In 1935, the husband & wife were jointly awarded the Nobel Prize in Chemistry “In recognition of their synthesis of new radioactive elements” Irène Joliot-Curie (1897-1956) Frédéric Joliot-Curie (1900-1958)

15. X-Ray Diffraction & The Bragg Equation • In 1915, the father & son were jointly awarded the Nobel Prize in Physics “For their services in the analysis of crystal structure by means of X-Rays". Sir William H. Bragg (1862-1942) Sir William L. Bragg (1890-1971) The younger Bragg was fighting in WWI when he received the Nobel Prize!

16. Invention of the Transistor • In 1956, these 3 were jointly awarded the Nobel Prize in Physics “For their researches on semiconductors & their discovery of the transistor effect”. John Bardeen (1908-1991) Walter Brattain (1902-1987) William Schockley (1910-1989)

17. Theory of Superconductivity Two Physics Nobel Prizes! • In 1972, these 3 were jointly awarded the Nobel Prize in Physics John Bardeen (1908-1991) Leon Cooper (1930-present) J. Robert Schrieffer (1931-present) “For their jointly developed theory of superconductivity, usually called the BCS-theory”.

18. Linus Pauling Nobel Prizes in two different fields! • In 1954, he was awarded the Nobel Prize in Chemistry “for his research into the nature of the chemical bond & its application to the elucidation of the structure of complex substances”. Linus Pauling (1901-1994) • In 1962, he was awarded the Nobel Peace Prize • “for his tireless work on behalf of nuclear weapons disarmament in the world”.

19. Overview ofThe Structure of Physics:Where doStatistical &Thermal Physicsfit in to the structure & organization?

20. The Structure of Physics Classical Physics is The Foundation of pure & applied (macroscopic) physics & engineering! Newton’s Laws+ Electromagnetism +Statistical Mechanics+ Thermodynamics. (The Latter Topics are what this course is about!) These together give a good description of most of the macroscopic world. Classical Mechanics (Newton, Lagrange, Hamilton,..) The Physics of the 17th & 18th Centuries. Still useful in the 21st Century!!

21. Physics Structure Classical Electromagnetism & Optics (Newton, Coulomb, Gauss, Ampere, Faraday, Maxwell,..) The Physics of the 18th & 19th centuries. Still useful in the 21st Century! High Speeds(v ≤ ~ c)  Special (& General) Relativity (Einstein, ..) 20th Century Physics!

22. Physics Structure Small Size(atomic & smaller): Quantum Mechanics (Bohr,Schrödinger, Heisenberg….) 20th century physics! Relativity + Quantum Mechanics: Relativistic Quantum Mechanics (Dirac,…) 20th century physics! Quantum Field Theory (Feynman,Schwinger, ..) 20th century physics!

23. “Mechanics” • HOW objects move (behave) under given forces. • (Usually) Does not deal with the sourcesof forces. Answers the question: Given the forces, how do objects move? • Forces in the universe are classified into 4 types: The 4 Fundamental Forces Of Nature! Some version of Mechanics applies to all four!

24. The 4 Fundamental Forces of NatureThe sourcesof the forces, in order of decreasing strength

25. The 4 Fundamental Forces of NatureThe sourcesof the forces, in order of decreasing strength The Strong Nuclear Force: Binds nuclei together. Explained by the “Standard Model” & Quantum Chromodynamics. Still being researched.

26. The 4 Fundamental Forces of NatureThe sourcesof the forces, in order of decreasing strength The Strong Nuclear Force: Binds nuclei together. Explained by the “Standard Model” & Quantum Chromodynamics. Still being researched. The Electromagnetic Force: E&M phenomena. Chemical forces. Most everyday forces. Maxwell, Coulomb, Ampere, Faraday, ...

27. The 4 Fundamental Forces of NatureThe sourcesof the forces, in order of decreasing strength The Strong Nuclear Force: Binds nuclei together. Explained by the “Standard Model” & Quantum Chromodynamics. Still being researched. The Electromagnetic Force: E&M phenomena. Chemical forces. Most everyday forces. Maxwell, Coulomb, Ampere, Faraday, ... The Weak Nuclear Force: Nuclear decay. Fermi, Bethe, others. Electroweak Theory.

28. The 4 Fundamental Forces of NatureThe sourcesof the forces, in order of decreasing strength The Strong Nuclear Force: Binds nuclei together. Explained by the “Standard Model” & Quantum Chromodynamics. Still being researched. The Electromagnetic Force: E&M phenomena. Chemical forces. Most everyday forces. Maxwell, Coulomb, Ampere, Faraday, ... The Weak Nuclear Force: Nuclear decay. Fermi, Bethe, others. Electroweak Theory. The Gravitational Force: Newton (classical mechanics), Einstein (general relativity), Hawking….

29. The 4 Fundamental Forces of NatureThe sourcesof the forces, in order of decreasing strength

30. The Four Fundamental Forces The “Electro-Weak” Force Since ~ the late 1960’s, in some sense, the 4 fundamental forces have been reduced to three! The Electromagnetic Force& the Weak Nuclear Forcewere combined into one theory. This was done by S. Weinberg & A. Salaam. For this work, they received the 1979 Nobel Prize in Physics!

31. The Standard Model of Particle Physics “Periodic Table for Elementary Particles”!Quantum Chromodynamics (QCD) & the Electroweak Theory Protons & Neutrons consist of 3 Quarks each.

32. The Standard Model

33. The Standard Model

34. The Standard Model

36. The Rest of Physics! • What we’ve mentioned so far is  all of physics except: Statistical Mechanics: (This course ≡“Stat Mech” ) “Stat Mech” is the mechanics of systems of huge numbers (>> ~ 1023) of particles. Stat Mech: 1. Uses Probability & Statistics to calculate macroscopic properties from microscopic force laws. 2. Applies to BOTHthe Classical & the Quantum worlds! 3.Is the major linkbetween microscopic & macroscopic physics! 4.Contains Thermodynamicsas a sub-theory!

37. The Most Important Point: Statistical Mechanics is important because it is the major link between microscopic & macroscopic physics!