""" Quantum Field Theory: Skeletal draft of objects Rich Data Series
To help with studies, students learning Python might bend its notation to help them wrap their heads around this and that. Here's a module I've been working on after listening to Sean Carroll's ISEPP lecture in Portland last night (isepp.org). Write-up: http://worldgame.blogspot.com/2012/11/isepp-physics-lecture.html I haven't double checked everything as the primary idea is to get across the idea. People will role their own. These are more in the way of doodles at this point, minus much of anything to hold it together. Slapping it out there as open source. If you fix a broken bit, fork a new version, take it as inspiration to start from scratch, feel free to add your name to the list of contributors. Many of you have already. My thanks to the Wikipedia articles and other authors I read and/or listened to or otherwise appreciated. Other Rich Data Structure stuff http://mail.python.org/pipermail/edu-sig/2005-November/005533.html http://www.mail-archive.com/edu-sig@python.org/msg02457.html http://mybizmo.blogspot.com/2008/01/rich-data-structures.html K. Urner edu-sig """ ANTI = True class Fermion(): """fractional spin, Fermi-Dirac statistics""" spin = 1/2 # J class Boson(): """whole number spin, Bose-Einstein statistics""" spin = 0 # may override in subclass to 1 or 2 (Higgs) class Field: pass class Strong(Field): """ quantum chromodynamics """ def __init__(self, anti=False): self.anti = anti if anti: self.color = "anti-" + self.color # reverse color if anti-particle class ElectroWeak(Field): """ quantum electrodynamics """ def __init__(self, anti=False): self.anti = anti if anti: self.charge = -self.charge # reverse charge if anti-particle # Quarks: 6 with oppositely charged pairs = 12, each with 3 colors = 36 permutations class Quark(Fermion, Strong, ElectroWeak): """ Meson = Quark + Quark Baryon = Quark + Quark + Quark (e.g. proton, neutron) """ def __init__(self, color, anti=False): color = color.lower() if color not in ["blue", "red", "green"]: raise ValueError Strong.__init__(self, anti) ElectroWeak.__init__(self, anti) # reverse charge if anti class Up(Quark): mass = 2.4 # m Mev/c2 charge = 2/3 # Q class Down(Quark): mass = 4.4 charge = -1/3 class Charm(Quark): mass = 1320 charge = 2/3 class Strange(Quark): mass = 87 charge = -1/3 class Top(Quark): mass = 172700 charge = 2/3 class Bottom(Quark): mass = 4240 charge = -1/3 # Gauge Bosons class W(Boson, ElectroWeak): mass = 80387 charge = 1 spin = 1 class Z(Boson, ElectroWeak): mass = 91187.6 charge = 0 spin = 1 class Photon(Boson, ElectroWeak): mass = 0 charge = 0 class Gluon(Boson, Strong): spin = 1 # overrides attribute of Boson mass = 0 charge = 0 def __init__(self, color, anticolor): self.color = coler self.anticolor = anticolor # Higgs Boson class Higgs(Boson): spin = 2 # overrides attribute of Boson mass = 125000 charge = 0 # Leptons (6 + 6 anti = 12) class Electron(Fermion, ElectroWeak): mass = 0.511 charge = -1 class Tau(Fermion, ElectroWeak): mass = 1776.82 charge = -1 class Muon(Fermion, ElectroWeak): mass = 105.7 charge = -1 # masses are superpositional class Neutrino_E(Electron): mass = .0022 charge = 0 class Neutrino_T(Tau): mass = 0.17 charge = 0 class Neutrino_M(Muon): mass = 15.5 charge = 0 # Hadrons (composed of 2 or 3 quarks, or "exotic" if more (not confirmed) class Baryon(Fermion, Strong, ElectroWeak): pass class Nucleon(Baryon): """Baryon -- one of two kinds of Hadron""" class Proton(Nucleon): """ Up("blue") + Up("red") + Down("green") Proton() + Electron() -> Neutron() + Neutrino_E() """ mass = 938.27 charge = 1 class Neutron(Nucleon): """ Down("green") + Down("red") + Up("blue") Neutron() -> Proton() + Electron() + Neutrino_E(ANTI) """ mass = 939.57 charge = 0 class Sigma(Baryon): """ Have two Ups or two Downs, and one something else (charm, strange, bottom, top -- tops are too fast) """ pass class Omega(Baryon): """ Have no Up or Down quarks """ class Lambda(Baryon): """ One Up, One Down, and one something else """ class Xi(Baryon): """ One up or down + two heavier quarks """ class Delta(Baryon): """ up and down quarks only, spin 3/2 vs. nucleon 1/2 Decay into nucleon + pion in short order """ mass = 1232 class Meson(Boson, Strong, ElectroWeak): """ Meson -- the other kind of Hadron besides Baryon Unstable. Charged -> electrons + neutrinos, Uncharged -> photons Flavorless (quarkonium): quark + anti-quark of same type Flavorful: quark + anti-quark of different type """ class D(Meson): """Flavorful with charm""" class B(Meson): """Flavorful with charm""" class Upsilon(Meson): """Flavorless with bottom (bottomonium, a form of quarkonium)""" mass = 9460 spin = 1 class JPsi(Meson): """Flavorless with charm (excited charmonium)""" pass class Pion(Meson): """ Up() + Down(ANTI) charge = 1 --> 99.9877% Muon(ANTI) + Neutrino_M(), .0123% Electron(ANTI) + Neutrino_E Up() + Up(ANTI) or Down() + Down(ANTI) charge = 0 Down() + Up(ANTI) charge = -1 --> 99.9877% Muon() + Neutrino_M(ANTI), .0123% Electron() + Neutrino_E(ANTI) """ mass = 139.57 # if charged, else 135 parity = -1 class Rho(Meson): mass = 770 class Phi(Meson): """ Flavorless with strange """ mass = 1019.4 charge = 0 # 3 states class Kaon(Meson): # K Mesons """ Four types Flavorful: Strange() + Up() or Down() """ charge = 1 mass = 493.7 if charge == (1 or -1) else 497.6 class Eta(Meson): charge = 0 _______________________________________________ Edu-sig mailing list Edu-sig@python.org http://mail.python.org/mailman/listinfo/edu-sig
