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Final Answers
© 2000-2017   Gérard P. Michon, Ph.D.

Quantum Field Theory


Coat of arms of Niels Bohr Coat of arms of Paul A.M. Dirac
In science, one tries to tell people something that no one ever knew before, in such a way as to be understood by everyone.
But in poetry, it's the exact opposite.
Paul A.M. Dirac (1902-1984; Nobel 1933)
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Related articles on this site:

Related Links (Outside this Site)

LBNL:   The Particle Adventure  |  QuarkDance  |  Educational Sites
Contemporary Physics Education Project  (CPEP)   |   QuarkNet
QED of Qubits  by   Iwo Bialynicki-Birula  and  Tomasz Sowinski.
Quantum Field Theory has no Problems  by   Lubos Motl.
Feynman Diagrams for the Masses  by   Carl Brannen.
Bethe-Salpeter Equation  by   Francesco Sottile.

Textbooks on Quantum Field Theory :   [ discussion ]

  • "Relativistic Quantum Fields"  James D. Bjorken & Sidney D. Drell  (1965).
  • "Fields"  (electronic QFT textbook)  by  Warren Siegel  (1999-2005).
  • "Quantum Field Theory"  (pdf lecture notes)  by  Uwe-Jens Wiese  (2007).
  • Quantum Field Theory  by  Mark Srednicki  (Cambridge 2007) pdf draft.
     
  • "A First Book on Quantum Field Theory"  by  A. Lahiri & P.B. Pal  (2005).
  • Quantum Field Theory in a Nutshell   by  Anthony Zee  (Princeton, 2003).
  • "A Modern Introduction to QFT"  by  Michele Maggiore  (Oxford).
  • "Field Quantization"  by  Walter Greiner & Joachim Reinhardt  (Springer).
  • An Introduction to QFT   Michael E. Peskin & Dan V. Schroeder (1995).
  • Quantum Field Theory   by  Lewis H. Ryder  (Cambridge, 1985, 1996).
  • "Quantum Field Theory"  by  F. Mandl & G. Shaw  (Wiley, 1984, 1993).
  • "Field Theory: A Modern Primer"  by  Pierre Ramond  (1990).
  • "Advanced Quantum Mechanics"  by  Jun John Sakurai  (1967).
  • The Quantum Theory of Fields   by  Steven Weinberg  (Cambridge; Foundations (I) 1995, Applications (II) 1996, Supersymmetry (III) 2000).

Videos :

 
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Quantum Field Theory

 (2017-06-28)   Quantum Electrodynamics   (QED)

In 1947,  Polykarp Busch  made a precise determination of the magnetic moment of the electron expressed in  Bohr magnetons,  namely:

1.00119

Come back later, we're still working on this one...

Polykarp Kusch (1911-1993; Nobel 1955).
 
QED: Experimental evidence (5:44)  by  Don Lincoln   (Fermilab, 2016-04-19).
Quantum Electrodynamics (15:21)  by  Matt O'Dowd   (PBS Space Time, 2017-06-28).

(2007-08-06)   Elementary Particles

The following units are used, respectively, for spin, electric charge and mass.

Elementary Fermions  (matter) :

Leptons  (no color) Quarks  (colored)
NameSpinChargeMass NameSpinChargeMass
 e -
 ne		 1/2
1/2		  -1 
 0 		  0.510998928(11) 
 < 0.01  		 u <
 d 		 1/2
1/2		 +2/3
-1/3		  3 
 6 
 m -
 nm		 1/2
1/2		  -1 
 0 		  105.6583715(35) 
 < 0.2  		 c 
 s 		 1/2
1/2		 +2/3
-1/3		  1300 
 100 
 t -
 nt		 1/2
1/2		  -1 
 0 		  1776.82(16) 
 < 20  		 t 
 b 		 1/2
1/2		 +2/3
-1/3		  171400 
 4300 

Quarks are normally not observed alone but in composite particles known as  hadrons  of which there are two broad types, mesons  and  baryons :

  • A  meson  is a boson consisting of a quark and its antiquark.
  • A  baryon  is a fermion combining 3 quarks in a color-neutral way.

Elementary Bosons  (force fields) :

Electroweak Bosons  (no color) Other Elementary Bosons
NameSpinChargeMass NameSpinChargeMass
 g 
(photon)		  1   0   0  G
(graviton)		 2 0 0
 Z0  1   0   91187  g
(8 colored gluons)		 1 0 0
 W -
 W +		  1 
 1 		  -1 
 +1 		  80400   H0
(Higgs boson)		 0 0 125300

The Inevitability of Physical Laws: Why the Higgs Has to Exist  by  Nima Arkani-Hamed  (IAS, 2012-10-26).
The Salam Lecture Series 2012,  by  Nima Arkani-Hamed   1 | 2 | 3? | 4 | 5 |

(2012-07-31)   Quantum Chromodynamics  (QCD).  The strong force.
The whole  hadron  zoo:  Mesons  (2 quarks)  and  baryons  (3 quarks).

Some Baryons
DateNameSymbolQuarksSpinChargeMassLifetime
1911protonpuud 1/2+1 938.272 ¥
1932 neutronnudd 1/20 939.565 881 s
  delta
resonances		 D++
D+
D0
D-		  uuu 
 uud 
 udd 
 ddd 		 3/2  +2 
 +1 
 0 
 -1 		 1232 5.6 ys
1950lambda L0uds 1/20 1115.7 263 ps
1953sigmaS+uus 1/2+1 1189 80 ps
1964omega minusW-sss 3/2-1 1672 82 ps
2007cascade BXb-dsb 1/2-1 5792 1.42 ps

Come back later, we're still working on this one...

99 Years of Discovery: What are Cosmic Rays?   by Nahee Park  (2011)
Wikipedia :   Quantum Chromodynamics   |   Timeline of particle discoveries

Pascual Jordan
Pascual Jordan
1902-1980
(2007-07-23)   Second Quantization
Particles are modes of a quantized field.

Come back later, we're still working on this one...

Canonical quantization

(2007-07-12)   The Bethe-Salpeter Equation   (1951)
A relativistic equation for bound-state problems.

Come back later, we're still working on this one...

(2012-07-22)   Path Integral Formulation   (Feynman, 1948)
Richard P. Feynmann.

Come back later, we're still working on this one...

Path integral formulation
 
Feynman's Infinite Quantum Paths (15:48)  by  Matt O�Dowd  (PBS Space Time, 2017-07-07)

(2012-07-22)   Renormalization
From Charles-Eugène Guye (1866-1942) to Richard P. Feynmann (1918-1988). and Kenneth G. Wilson (1936-2013).

Come back later, we're still working on this one...

Renormalization   |   Divergent Series Redux

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