Date Sorted 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 2nd edition corrections page for additional corrections to both editions. Sorted by Date Posted: This Page Sorted by Page Number:   Click Here

Significant Corrections (may impact learning process)

 Pg Chap Date Posted Significant Correction Reported by (blank = the author) 46 3 Dec 13, 2013 In (3-21), the middle equation, j_i (covariant, subscript) should be j^i (contravariant, superscript) Michael Hyams 142 5 Dec 13, 2013 In (5-35), lower line, after first equal sign, switch mu and nu superscripts. Do the same after the third equal sign in the row. Luc Longtin 261 9 Dec 13, 2013 Under the heading “Other Diagrams”, replace the 2nd sentence with “Note there are no simple loops (i.e., photon loop, fermion loop, or vertex loop as shown above) in Fig. 9-6, 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 341 14 Dec 13, 2013 3rd margin note down: C2-7 should be C1-8 Holger Teutsch 386-387 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 386-387 . Holger Teutsch 399 15 Dec 13, 2013 In (15-132), after 2nd equal sign, insert 1/4. Holger Teutsch 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. 16-3, i.e., for scattering by an static external field, via the long Dyson-Wicks 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 472-473 17 Dec 13, 2013 Equations (17-134) to (17-143) have been changed to make them (much) easier to understand. See revised pgs at link: Chap_17_revised_pgs_472-473 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, (17-171) becomes the Mott scattering relation, good for relativistic or non-relativistic cases” Change margin note next to above to “Relativistic or non-relativistic scattering” Holger Teutsch 52-53 3 Nov 14, 2013 The derivation from ((3-44) to (3-47) has been revised to make it clearer and easier to understand. See pgs 52-53 revised. (Replaces post that was up for a few hours Nov 12.) Luc Longtin 76 3 Nov12, 2013 Fig 3-6 caption, delete minus sign before delta^+ Luc Longtin 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 144 5 Nov 5, 2013 Replace 1st sentence at top of page with “For A aligned with the epsilon_2^mu direction in Fig. 5-2, B would be perpendicular to it (x^1 direction) and E would be parallel.” Marius Paraschiv 120 4 Nov1, 2013 In the para. below (4-137), 4th and 5th 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 108 4 Oct 31, 2013 2nd line up from bottom: Replace “3 d type … 2 others with different” with “two d type particles of different” Marius Paraschiv 326-328 13 Oct 28, 2013 Derivation of Ward identities is sketchy and hard to understand. An expanded, easier-to-understand version is at the link clearer Ward identities proof Holger Teutsch 81 3 Oct 23, 2013 (3-164) should have d 3k instead of d 3x, and insert a k at end of 1st line. Marius Paraschiv 177 6 Oct 23, 2013 Under Other Uses, delete “It also can … 14 and 15.)” 323 13 Oct 7, 2013 Fig. 13-1, 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 (13-8), the B term, delete the gamma matrix factor. Jason Koeller 327 13 Oct 7, 2013 In (13-28) the subscript r_3 \nu should be r_3 \eta Jason Koeller 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. 132 4 Sept 18, 2013 . 133 4 Sept 17, 2013 Prob. 28, gamma matrix superscript “0” should be “1”. 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. 198 7 Aug 27, 2013 At the end of the paragraph containing (7-60), insert “ We caution the reader that we are being a bit cavalier mathematically here, since HII 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$(7-60).” Holger Teutsch 201 7 Aug 27, 2013 After the first paragraph under Fig. 7-3, insert “ Note that Appendix B clarifies some subtle mathematical issues in$(7-60), (7-61), and (7-67).” After present Appendix, insert new Appendix B, Chap 7 Holger Teutsch 203-209 7 Aug19, 2013 Changes to Chap. 7 to make learning easier. See link Clarifications for Chap 7 Holger Teutsch 285 10 Aug 15, 2013 Appendix E, Chap 10 added.  See new Appendix E, Chap 10 192 7 Aug 9, 2013 1st line after (7-41), “H.P.” should be “I.P.” Jason Koeller 271 10 Aug 9, 2013 Last line. Footnote “1” refers to footnote 1 on next pg. (272). David Scharf 21 2 June 13, 2013 Wholeness Chart 2-2, RH page, 1st and 3rd columns, 9th cell down. All pi and pi should be pi and pi. In 2nd column, every subscript i should be superscript. Ramon Salazar found a sign error in Prob. 3-13. Led to this. 23 2 June 13, 2013 Box 2-2, has been revised. See revised Box 2-2. From Ramon Salazar’s find.  See pg. 21. 64 3 June 13, 2013 In eq. (3-100), insert minus sign after second and third equal signs. From Ramon Salazar’s find.  See pg. 21. 108 4 June 13, 2013 In (4-76), subscripts r on the RH of each = sign should be underlined. (Indicating no summation.) Under (4-76), add sentence “The subscript underbars indicate no summation on the r index.” Holger Teutsch 113 4 June 13, 2013 In eq. (4-106), insert minus sign after first equal sign. From Ramon Salazar’s find.  See pg. 21. 157 5 June 13, 2013 In Wholeness Chart 5-4, 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 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 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 (1-1) to (1-3). That is, , etc. are solutions of the QFT wave equations.” 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” 233 8 May 13, 2013 last margin note. “fermion” should be “anti-fermion” 244 8 May 13, 2013 Fig 8-11. Might be better to have 1st and 3rd 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. 405 16 May 13, 2013 Table of Fourier Transform Pairs, 3rd row, last “x > 0” should be  “ x < 0 “ 436 17 May 13, 2013

 Pg Chap Date Posted Minor Correction Reported by 124 4 June 30, 2014 Sect 4.14, 2nd paragraph, 1st sentence: Change “pg. 95” to  pg. 96 Sukruti Bansal 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 419 16 Dec 13, 2013 (16-72) should have (2pi)^3 in denominator instead of (2pi) 422 16 Nov 12, 2013 After (16-83), change line “Taking mu = 0 in ….” to “Examining only the mu = 0 term in the summation of (16-83) with A^e_mu arbitrary, we have” Holger Teutsch 52 3 Nov 11, 2013 At the end of eq. (3-45) insert “ = 0”. Luc Longtin 60 3 Nov 11, 2013 Tile of Sect. 3.6.5:  Insert blank space before “as” Luc Longtin 73 3 Nov 11, 2013 In last line of (3-122) insert “(factor)” in 2nd underbracket. Luc Longtin 76 3 Nov 11, 2013 2nd from last margin note, change “all” to “outer semicircle parts”. Also delete “except along real axis”. Luc Longtin 479 17 Nov 11, 2013 Sect. 17.6.1, 3rd line: Change “breaking” to “braking”. Holger Teutsch 142 5 Nov 5, 2013 (5-34) should have transpose symbol T on each row vector Marius Paraschiv 138 5 Nov 4, 2013 Eq. (5-20), the second F^31 should be F^13 Marius Paraschiv 376 15 Oct 30, 2013 3rd line above (15-13), 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 392 15 Oct 30, 2013 In the line just above (15-102) after the = sign, delete “1/”. Holger Teutsch 26-27 2 Oct 28, 2013 In eqs. (2-33) and (2-37) take out the /hbar in exponents to be consistent with ((2-35). That is, express these equations in natural units. Luc Longtin 31 2 Oct 28, 2013 Wholeness Chart 2-5, RH column, second line of second block change [uv  vu] to uv  vu. Luc Longtin 35 2 Oct 23, 2013 In the 2nd 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 (2-57). But in this book, the symbol  always equals , the Minkowski metric.” 184 7 Oct 23, 2013 In (7-7), total deriv wrspt x^mu should be partial deriv 226 8 Oct 23, 2013 In (8-51) delete “=” sign at end of 1st row and put period at end of last line of (8-52). 235 8 Oct 23, 2013 (8-89) should have double integration sign 243 8 Oct 23, 2013 In title of Sect. 8.10.1, delete “Approaching” 294 11 Oct 23, 2013 3rd line up from bottom. Exponent of e needs mu superscripted to x 328 13 Oct 23, 2013 Delete period before (13-32) 49 3 Sept 23, 2013 In (3-34), total deriv wrspt x^mu should be partial deriv 104 4 Sept 23, 2013 In (4-61), total deriv wrspt x^mu should be partial deriv 144 5 Sept 23, 2013 In (5-42), total deriv wrspt x^mu should be partial deriv 19 2 Sept 11, 2013 Second line after (2-20), change “surface” to  3D “surface” 15 2 Sept 9, 2013 Above (2-1), before “(see the …)”, insert “plus ct” 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  ” 295 11 Aug 27, 2013 Near bottom, in 3), gamma should be larger font. Holger Teutsch 198 7 Aug 27, 2013 Just after (7-60), change the two lines “where things work … with (7-76).” to the following “where we note that K in front must equal unity, since, for t = ti in$(7-60), Soper = K, but to agree with$(7-56), Soper must = I, the identity operator.” 207 7 Aug 22, 2013 Sect. 7.8.3, 2nd paragraph, change “the Appendix” to “Appendix A” 210 7 Aug 22, 2013 Sect. 7.11, Change “Appendix” to “Appendix A” 203 7 Aug 15, 2013 Heading “Notation modification” needs upper case M. 36 and 42 2 and 3 Sept 6, 2013 and Aug 12, 2013 After Prob. 2-4, part b) and after (3-8), 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 49 3 Aug 12, 2013 Last paragraph, after “Laplacian”, insert “symbol”. 271 10 Aug 9, 2013 Sect. 10.2.2, 3rd line, change “and” to “and that prediction” 135 to 139 5 June 18, 2013 Margin notes with lower case symbol  for scalar potential should be changed to Φ 173 6 June 13, 2013 Just under Sect 6.5.3 heading, “Emily” should be “Emmy” Holger Teutsch 23 2 June 3, 2013 In para #9, delete space after “Wholeness Chart 2-2.” 448 17 June 3, 2013 Fig. 17-13 slanted lines for absolute values should be vertical lines 62 3 May 24, 2013 in (3-88), make exponents all same size font 64 3 May 24, 2013 above (3-101) insert space between “into” and “(3-100)” 82 3 May 24, 2013 Prob. 13. Delete extra space after “momenta,” 442 17 May 20, 2013 Mid page, “wave- like”, delete space before “like” 123 4 May 16, 2013 Eq. (4-157), last row has double equal sign, delete one 233 8 May 14, 2013 2nd margin note, “p” at end cut off on bottom 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. v May 13, 2013 Table of Contents, 2 places. Four Current should be Four-Current. (Sect 3.7 & 4.7) ix May 13, 2013 Table of Wholeness Charts. 17-1 appears twice. Delete one of them. 28 2 May 13, 2013 2nd line up from bottom: Change “the thing that moves and evolves” to “what move and evolve”. 31 2 May 13, 2013 Remove period after margin note 37 2 May 13, 2013 Prob. 12, exponents, 0 should not be italic; t should be lower down, 3 places. 45 3 May 13, 2013 Box 3-1. (B3-1.6) should be moved leftward a tad. 94 4 May 13, 2013 Box 4-1, (B4-1.5) should move left at tad. 96 4 May 13, 2013 Fig. 4-1. Lines around S in |S| are slanted. Change to vertical. 99 4 May 13, 2013 last line bold “)” should be unbold. 124 4 May 13, 2013 γ-matrices should have space after γ. 3 places. 135 5 May 13, 2013 Maxwell’s equations in form presented actually due to Oliver Heaviside formulation (of Maxwell’s earlier form). 156 5 May 13, 2013 WhCh 5-4, last row, r values, etc should be same size font for spin 1/2 and 1. 221 8 May 13, 2013 Fig 8-2, all lines not same width. Same for other figs in other places. 222 8 May 13, 2013 Chap. 8, pg 222, eqs (8-31) and (8-33) can be moved leftward so numbers align with other eqs. 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 2nd line: “3-momenta” to 3-momentum 276 10 May 13, 2013 eq (10-15) 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 . 295 11 May 13, 2013 Margin notes not aligned ( 2 places) 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. 336 13 May 13, 2013 near bottom. Heading “WardWard identities” should have one less “Ward”. 356 14 May 13, 2013 Fig 14-7, 2nd 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 369-371   Have (cont.) in top chart and (continued) in bottom. 373 14 May 13, 2013 delete space between problems 4 and 5. 387 15 May 13, 2013 Pgs. 387, 392, 393, 397  in margin note, make non italic. 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. 423 16 May 13, 2013 margin μ exponent space from γ (2 places); also pg 424 444 17 May 13, 2013 Missing period at end of footnote. 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 (17-105) eq number 474 17 May 13, 2013 symbol  in margin note, make non italic. 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.