Corrections to First Edition of Student Friendly Quantum Field Theory
Note: 1) All changes listed here are included in 2nd edition. 2) 1st edition users also need to check 2^{nd} edition corrections page for additional corrections to both editions.

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Significant Corrections (may impact learning process)
Pg 
Chap 
Date Posted 
Significant Correction 
Reported by (blank = the author) 
3 
1 
May 14, 2013 
At end of Sect. 1.4, add the following paragraph “These operator solutions of the QFT wave equations turn out to be the very creation and destruction operators used to find transition amplitudes such as that of (11) to (13). That is, , etc. are solutions of the QFT wave equations.” 

21 
2 
June 13, 2013 
Wholeness Chart 22, RH page, 1^{st} and 3^{rd} columns, 9^{th} cell down. All p^{i} and p^{i} should be p_{i} and p_{i}. In 2^{nd} column, every subscript i should be superscript. 
Ramon Salazar found a minus sign error in Prob. 313 that led to this change. 
23 
2 
June 13, 2013 
Box 22, has been revised. See revised Box 22. 
From Ramon Salazar’s find. See pg. 21. 
36 
2 
Sept 9, 2013 
Delete the second part (last paragraph) of Prob. 5 in Chap. 2. This part of the problem is confusing, at the least, since a correct answer requires reading of Chap. 3 first. 

46 
3 
Dec 13, 2013 
In (321), the middle equation, j_i (covariant, subscript) should be j^i (contravariant, superscript) 
Michael Hyams 
5253 
3 
Nov 14, 2013 
The derivation from ((344) to (347) has been revised to make it clearer and easier to understand. See pgs 5253 revised. (Replaces post that was up for a few hours Nov 12.) 
Luc Longtin 
64 
3 
June 13, 2013 
In eq. (3100), insert minus sign after second and third equal signs. 
From Ramon Salazar’s find. See pg. 21. 
76 
3 
Nov12, 2013 
Fig 36 caption, delete minus sign before delta^+ 
Luc Longtin 
81 
3 
Oct 23, 2013 
(3164) should have d ^{3}k instead of d ^{3}x, and insert a k at end of 1^{st} line. 
Marius Paraschiv 
108 
4 
June 13, 2013 
In (476), subscripts r on the RH of each = sign should be underlined. (Indicating no summation.) Under (476), add sentence “The subscript underbars indicate no summation on the r index.” 
Holger Teutsch 
108 
4 
Oct 31, 2013 
2^{nd} line up from bottom: Replace “3 d type … 2 others with different” with “ two d type particles of different” 
Marius Paraschiv 
113 
4 
June 13, 2013 
In eq. (4106), insert minus sign after first equal sign. 
From Ramon Salazar’s find. See pg. 21. 
120 
4 
Nov1, 2013 
In the para. below (4137), 4^{th} and 5^{th} lines. Change the sentence in parentheses to “(To be precise it is a numeric spinor space matrix function. But it is not an operator matrix function.)” 
Marius Paraschiv 
131 
4 
May 24, 2013 
Prob. 4 at end of last sentence, before period, insert “(although each equation will have one component equal to zero)”. 
Ramon Salazar 
132 
4 
Sept 18, 2013 


133 
4 
Sept 17, 2013 
Prob. 28, gamma matrix superscript “0” should be “1”. 

142 
5 
Dec 13, 2013 
In (535), lower line, after first equal sign, switch mu and nu superscripts. Do the same after the third equal sign in the row. 
Luc Longtin 
144 
5 
Nov 5, 2013 
Replace 1^{st} sentence at top of page with “For A aligned with the epsilon_2^mu direction in Fig. 52, B would be perpendicular to it (x^1 direction) and E would be parallel.” 
Marius Paraschiv 
157 
5 
June 13, 2013 
In Wholeness Chart 54, just above heading “Creation and Destruction Operators”, each subscript r on right side of equal signs should be underlined. (Indicating no summation.) 
Holger Teutsch 
161 
5 
June 13, 2013 
In Prob. 7, insert “RQM” before “Hamiltonian operator”. 
Holger Teutsch 
167 
6 
May 13, 2013 
Sect. 6.2.2. At the end of the first sentence under heading “Newton’s Laws: Invariant ….”, before the period, change “under rotation” to “under a passive rotation transformation” 

177 
6 
Oct 23, 2013 
Under Other Uses, delete “It also can … 14 and 15.)” 

180 
6 
Oct 2, 2013 
Probs. 13, 14 and 15 have been revised. The revisions plus the solution to Prob. 14 can be found at Chap6_prob_revs. Do not try these problems as found in the text. 

189 
7 
Nov 12, 2013 
In last sentence above “Expectation Values for O as a Quantum Field”, after “time derivative” insert “of the expectation value” 
Marius Paraschiv 
192 
7 
Aug 9, 2013 
1^{st} line after (741), “H.P.” should be “I.P.” 
Jason Koeller 
198 
7 
Aug 27, 2013 
At the end of the paragraph containing (760), insert “ We caution the reader that we are being a bit cavalier mathematically here, since H_{I}^{I} is an operator and not a c number. Doing it this way should help make things easier to understand at this point, but after finishing Sect. 7.6, you may wish to read Appendix B, to see precisely what we mean by$(760).”

Holger Teutsch 
201 
7 
Aug 27, 2013 
After the first paragraph under Fig. 73, insert “ Note that Appendix B clarifies some subtle mathematical issues in$(760), (761), and (767).” After present Appendix, insert new Appendix B, Chap 7 
Holger Teutsch 
203209 
7 
Aug19, 2013 
Changes to Chap. 7 to make learning easier. See link Clarifications for Chap 7 
Holger Teutsch 
233 
8 
May 13, 2013 
last margin note. “fermion” should be “antifermion” 

244 
8 
May 13, 2013 
Fig 811. Might be better to have 1^{st} and 3^{rd} rows exchanged with arrow for time going upward. Then velocity vectors of real particles will go upward in direction of time and the way eyes would typically follow it. 

261 
9 
Dec 13, 2013 
Under the heading “Other Diagrams”, replace the 2^{nd} sentence with “Note there are no simple loops (i.e., photon loop, fermion loop, or vertex loop as shown above) in Fig. 96, though there is what we might call a “loop”. However, the term loop in QFT, generally, and in this book, always, refers only to one of the three simple loops shown above.” 
Holger Teutsch 
271 
10 
Aug 9, 2013 
Last line. Footnote “1” refers to footnote 1 on next pg. (272). 
David Scharf 
285 
10 
Aug 15, 2013 
Appendix E, Chap 10 added. See new Appendix E, Chap 10 

323 
13 
Oct 7, 2013 
Fig. 131, the RH digram, the brace on the right should not extend down so far. It should include the virtual photon, but not the external electron and positron 
Jason Koeller 
324 
13 
Oct 7, 2013 
In (138), the B term, delete the gamma matrix factor. 
Jason Koeller 
327 
13 
Oct 7, 2013 
In (1328) the subscript r_3 \nu should be r_3 \eta 
Jason Koeller 
326328 
13 
Oct 28, 2013 
Derivation of Ward identities is sketchy and hard to understand. An expanded, easiertounderstand version is at the link clearer Ward identities proof 
Holger Teutsch 
341 
14 
Dec 13, 2013 
3^{rd} margin note down: C27 should be C18 
Holger Teutsch 
386387 
15 
Dec 13, 2013 
From top of pg 386 to just before Sect 15.4.3 on pg 387 has been revised to be easier to understand. See link: Chap 15 revised pgs 386387 . 
Holger Teutsch 
399 
15 
Dec 13, 2013 
In (15132), after 2^{nd} equal sign, insert 1/4. 
Holger Teutsch 
405 
16 
May 13, 2013 
Table of Fourier Transform Pairs, 3^{rd} row, last “x > 0” should be “ x < 0 “ 

415 
16 
Dec 13, 2013 
Bottom of pg and continuing on to top of pg 416, change “It turns out….we could” to “In the Appendix, we derive the transition amplitude for the RH diagram of Fig. 163, i.e., for scattering by an static external field, via the long DysonWicks expansion method (rather than the short way of Feynman rules, since we don’t yet have any Feynman rules for this.). From that derivation, we then” 
Holger Teutsch 
430 
16 
Dec 13, 2013 
Add the appendix at this link: Chap 16 new appendix 
Holger Teutsch 
436 
17 
May 13, 2013 


472473 
17 
Dec 13, 2013 
Equations (17134) to (17143) have been changed to make them (much) easier to understand. See revised pgs at link: Chap_17_revised_pgs_472473 
Holger Teutsch 
479 
17 
Dec 13, 2013 
Change heading “Relativistic (Mott) Scattering” to “Mott Scattering (any energy level)”. Change sentence under that heading to “Since p^2 + m^{ }^2 = E^{ }^2 and p = Ev, (17171) becomes the Mott scattering relation, good for relativistic or nonrelativistic cases” Change margin note next to above to “Relativistic or nonrelativistic scattering” 
Holger Teutsch 
Minor Corrections (should not impact learning process)
Pg 
Chap 
Date Posted 
Minor Correction 
Reported by 
v 

May 13, 2013 
Table of Contents, 2 places. Four Current should be FourCurrent. (Sect 3.7 & 4.7) 

ix 

May 13, 2013 
Table of Wholeness Charts. 171 appears twice. Delete one of them. 

xi 

May 13, 2013 
Preface, para 1) title. “Avoided” should not be capitalized. 

xi 

May 13, 2013 
Preface. Wholeness Charts should not be capitalized. A number of places. 

15 
2 
Sept 9, 2013 
Above (21), before “(see the …)”, insert “plus ct” 

19 
2 
Sept 11, 2013 
Second line after (220), change “surface” to 3D “surface” 

23 
2 
June 3, 2013 
In para #9, delete space after “Wholeness Chart 22.” 

2627 
2 
Oct 28, 2013 
In eqs. (233) and (237) take out the /hbar in exponents to be consistent with ((235). That is, express these equations in natural units. 
Luc Longtin 
28 
2 
May 13, 2013 
2^{nd} line up from bottom: Change “the thing that moves and evolves” to “what move and evolve”. 

31 
2 
Oct 28, 2013 
Wholeness Chart 25, RH column, second line of second block change [uv vu] to uv vu. 
Luc Longtin 
31 
2 
May 13, 2013 
Remove period after margin note 

35 
2 
Oct 23, 2013 
In the 2^{nd} paragraph, after “… for ”, insert: “Note that in general relativity, you will find the Minkowski metric, which is commonly designated by in QFT, to be designated by the symbol . In relativity, usually refers to any general metric, not necessarily of form shown in (257). But in this book, the symbol always equals , the Minkowski metric.” 

37 
2 
Sept 9, 2013 
In Prob. 8, after “… delta”, insert “where take on only values 1,2,3. In that case, it is better expressed as .” 

37 
2 
May 13, 2013 
Prob. 12, exponents, 0 should not be italic; t should be lower down, 3 places. 

36 and 42 
2 and 3 
Sept 6, 2013
Aug 12, 2013 
After Prob. 24, part b), and after (38), insert “The operation is called the d’Alembertian operator, and is the 4D Minkowski coordinates analogue of the 3D Laplacian operator of Cartesian coordinates.” 
Thomas Fowler 
45 
3 
May 13, 2013 
Box 31. (B31.6) should be moved leftward a tad. 

49 
3 
Sept 23, 2013 
In (334), total deriv wrspt x^mu should be partial deriv 

49 
3 
Aug 12, 2013 
Last paragraph, after “Laplacian”, insert “symbol”. 

52 
3 
Nov 11, 2013 
At the end of eq. (345) insert “ = 0”. 
Luc Longtin 
60 
3 
Nov 11, 2013 
Tile of Sect. 3.6.5: Insert blank space before “as” 
Luc Longtin 
62 
3 
May 24, 2013 
in (388), make exponents all same size font 

64 
3 
May 24, 2013 
above (3101) insert space between “into” and “(3100)” 

73 
3 
Nov 11, 2013 
In last line of (3122) insert “(factor)” in 2^{nd} underbracket. 
Luc Longtin 
76 
3 
Nov 11, 2013 
2^{nd} from last margin note, change “all” to “outer semicircle parts”. Also delete “except along real axis”. 
Luc Longtin 
82 
3 
May 24, 2013 
Prob. 13. Delete extra space after “momenta,” 

94 
4 
May 13, 2013 
Box 41, (B41.5) should move left at tad. 

96 
4 
May 13, 2013 
Fig. 41. Lines around S in S are slanted. Change to vertical. 

99 
4 
May 13, 2013 
last line bold “)” should be unbold. 

104 
4 
Sept 23, 2013 
In (461), total deriv wrspt x^mu should be partial deriv 

123 
4 
May 16, 2013 
Eq. (4157), last row has double equal sign, delete one 

124 
4 
May 13, 2013 
γmatrices should have space after γ. 3 places. 

124 
4 
June 30, 2014 
Sect 4.14, 2^{nd} paragraph, 1^{st} sentence: Change “pg. 95” to pg. 96 
Sukruti Bansal 
135 
5 
May 13, 2013 
Maxwell’s equations in form presented actually due to Oliver Heaviside formulation (of Maxwell’s earlier form). 

135 to 139 
5 
June 18, 2013 
Margin notes with lower case symbol for scalar potential should be changed to Φ 

138 
5 
Nov 4, 2013 
Eq. (520), the second F^31 should be F^13 
Marius Paraschiv 
142 
5 
Nov 5, 2013 
(534) should have transpose symbol T on each row vector 
Marius Paraschiv 
144 
5 
Sept 23, 2013 
In (542), total deriv wrspt x^mu should be partial deriv 

156 
5 
May 13, 2013 
WhCh 54, last row, r values, etc should be same size font for spin 1/2 and 1. 

173 
6 
June 13, 2013 
Just under Sect 6.5.3 heading, “Emily” should be “Emmy” 
Holger Teutsch 
184 
7 
Oct 23, 2013 
In (77), total deriv wrspt x^mu should be partial deriv 

198 
7 
Aug 27, 2013 
Just after (760), change the two lines “where things work … with (776).” to the following “where we note that K in front must equal unity, since, for t = t_{i} in$(760), S_{oper} = K, but to agree with$(756), S_{oper} must = I, the identity operator.” 

203 
7 
Aug 15, 2013 
Heading “Notation modification” needs upper case M. 

207 
7 
Aug 22, 2013 
Sect. 7.8.3, 2^{nd} paragraph, change “the Appendix” to “Appendix A” 

210 
7 
Aug 22, 2013 
Sect. 7.11, Change “Appendix” to “Appendix A” 

221 
8 
May 13, 2013 
Fig 82, all lines not same width. Same for other figs in other places. 

222 
8 
May 13, 2013 
Chap. 8, pg 222, eqs (831) and (833) can be moved leftward so numbers align with other eqs. 

226 
8 
Oct 23, 2013 
In (851) delete “=” sign at end of 1^{st} row and put period at end of last line of (852). 

232 
8 
Dec 13, 2013 
The bra after the second equal sign should have primes on the k and r subscripts for gamma. 
Marius Paraschiv 
233 
8 
May 14, 2013 
2^{nd} margin note, “p” at end cut off on bottom 

235 
8 
Oct 23, 2013 
(889) should have double integration sign 

243 
8 
Oct 23, 2013 
In title of Sect. 8.10.1, delete “Approaching” 

268 
10 
May 13, 2013 
dash in header for Chapter 10 The Vacuum Revisited. (Probably white color dash in title) 

268 
10 
May 13, 2013 
2^{nd} line: “3momenta” to 3momentum 

271 
10 
Aug 9, 2013 
Sect. 10.2.2, 3^{rd} line, change “and” to “and that prediction” 

276 
10 
May 13, 2013 
eq (1015) can be moved left so number aligns with other eqs 

277 
10 
May 13, 2013 
Margin notes not aligned 

291 
11 
May 13, 2013 
Margin notes not aligned 

293 
11 
May 13, 2013 
Heading 11.5.1: “on” should be of . 

294 
11 
Oct 23, 2013 
3^{rd} line up from bottom. Exponent of e needs mu superscripted to x 

295 
11 
May 13, 2013 
Margin notes not aligned ( 2 places) 

295 
11 
Aug 27, 2013 
Near bottom, in 3), gamma should be larger font. 
Holger Teutsch 
300 
11 
May 13, 2013 
Prob. 6. exponent in first row, mu needs to be raised. 

304 
12 
May 13, 2013 
“Toy Story” should be italicized. 

328 
13 
Oct 23, 2013 
Delete period before (1332) 

336 
13 
May 13, 2013 
near bottom. Heading “WardWard identities” should have one less “Ward”. 

356 
14 
May 13, 2013 
Fig 147, 2^{nd} row of figure, photon loop has spaces where connects to photon 

365 
14 
May 13, 2013 
symbol in margin notes, two places, make non italic. 

369 
14 
May 13, 2013 
pgs 369371 Have (cont.) in top chart and (continued) in bottom. 

373 
14 
May 13, 2013 
delete space between problems 4 and 5. 

376 
15 
Oct 30, 2013 
3^{rd} line above (1513), delete the sentence “The last line …chart.” In the next line, after “Note,” insert “for the last line in the chart,”. Delete the comma after “if” and insert a comma before “then”. 
Holger Teutsch 
387 
15 
May 13, 2013 
Pgs. 387, 392, 393, 397 in margin note, make non italic. 

392 
15 
Oct 30, 2013 
In the line just above (15102) after the = sign, delete “1/”. 
Holger Teutsch 
399 
15 
May 13, 2013 
footnote should start new with “1” on each page, but this is “2”. 

408 
16 
May 13, 2013 
Margin notes not aligned 

410 
16 
May 13, 2013 
symbol in margin note, make non italic. 

419 
16 
Dec 13, 2013 
(1672) should have (2pi)^3 in denominator instead of (2pi) 

422 
16 
Nov 12, 2013 
After (1683), change line “Taking mu = 0 in ….” to “Examining only the mu = 0 term in the summation of (1683) with A^e_mu arbitrary, we have” 
Holger Teutsch 
423 
16 
May 13, 2013 
margin μ exponent space from γ (2 places); also pg 424 

442 
17 
May 20, 2013 
Mid page, “wave like”, delete space before “like” 

444 
17 
May 13, 2013 
Missing period at end of footnote. 

448 
17 
June 3, 2013 
Fig. 1713 slanted lines for absolute values should be vertical lines 

452 
17 
May 13, 2013 
μ exponent space from γ 2/3 down on right side of page 

464 
17 
May 13, 2013 
delete period before (17105) eq number 

474 
17 
May 13, 2013 
symbol in margin note, make non italic. 

479 
17 
Nov 11, 2013 
Sect. 17.6.1, 3^{rd} line: Change “breaking” to “braking”. 
Holger Teutsch 
490 
18 
May 13, 2013 
margin note, part of last line is cut off. 

500 
18 
May 13, 2013 
symbol in margin note, make non italic. 
