Corrections to Student Friendly Quantum Field Theory

Corrections to Second Edition, 3^rd revision (Sept 2018) of

Student Friendly Quantum Field Theory

Note: 1st edition and 2^nd edition (prior versions) users also need to check this 2^nd edition, 3rd revision corrections page for additional corrections.

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)
171	6	Sept 19, 2022	(6-22): Insert a minus sign after “M^k =” and note that the last relation for Q^k is valid for v << 1. For v a significant fraction of the speed of light 1, and for more insight on (6-22), see www.quantumfieldtheory.info/Spinor_Lorentz_transf.pdf and the references in the footnote on this page.	Anthony Soong
516	19	Aug 30, 2022	2/3 down page: after “spin potential energy =”, delete the minus sign
411-412	16	Aug 29, 2022	Sect 16.4.1 has been re-written as Sect. 16.4.1 revision to make it clearer and easier to understand plus correct a couple of sign errors.
413	16	Aug 29, 2022	(16-42): after each equal sign, insert a minus sign. (16-43): change sign on last term from minus to plus. (16-45): change sign on last term from minus to plus.	Mikhail Denisov
420	16	Aug 29, 2022	(16-74): all three underbrackets: insert minus sign before i. (16-75): delete both minus signs	Mikhail Denisov
204	7	Aug 27, 2022	2^nd line after (7-78): After “theorem”, insert “for QED”
209	7	Aug 27, 2022	Beginning 4^th line down, replace entire sub-section ii) with Pg 209 sub-section ii) revision
352-354	14	Aug 27, 2022	A number of changes have been made on pages 352-354 to make the material there clearer and more precise. Substitute the material at this link Revision: pgs_352-354 for page 352 to the top part of page 354.
247	8	Aug 25, 2022	An addendum to the appendix of Chap 8 that adds some material and may help pedagogically can be found at Addendum to Chap 8 appendix. This is modified from an earlier post in 2019.
378	15	Aug 23, 2022	Above (15-27): Insert the following sentences. “In Prob. 2, we derive (15-27)(a). (15-27)(b) can be derived in similar fashion, but to save time, we can just assume we have looked up the integral in integral tables.”	Jack Freinhar
180	6	Feb 18, 2022	Prob. 15: Change the sentence “Note that … energy.” to “Hint: There are subtle issues (both in classical and quantum field theory) with using the Lagrangian to show this. (One needs to know about the stress-energy tensor in relativity theory, which we haven’t studied, for one.) Instead, show it directly from the Hamiltonian density.”	Mikhail Denisov
480	17	Feb18, 2022	(17-174): In the delta function, change minus omega to plus omega prime	Mikhail Denisov
49	3	Jan 17, 2022	Pedagogic addition, not a correction: For those who may not have had the prerequisite background of classical, relativistic fields, the derivation of (3-35) from (3-34) can be found at Finding (3-35) from (3-34)
119	4	Jan 11, 2022	(4-133) after the equal signs: switch the indices α and β	Mikhail Denisov
336	13	Jan 11, 2022	(13-66) under A(Λ, m): insert a minus sign before the first infinity	Mikhail Denisov
409, 431a	16	Jan 11, 2022	(16-28). r=1 should be r=2; and r=2 should be r=1. Same for statement of Problem 1.	Mikhail Denisov
37	2	June 24, 2021	Prob. 6, 5^th line: (xⁱ) should be (xⁱ, t)	Billy Bulgari
228	8	Nov 17, 2020	Eq (8-62) should have an additional factor of δ⁽⁴⁾(p’+k’-p-k)	Nadeem Afana
198	7	Oct 27, 2020	(7-61): It is less confusing if the dt has t primed, to compare with (7-60), although, strictly speaking it is OK as it is, as we no longer have t as part of the argument in S_oper, so we can use t instead of t primed for the integration variable.	Nadeem Afana
118	4	Aug 12, 2020	Eq (4-126): Insert a note in parentheses to the right of the equation: “(outer product)”. This is also true in the second row of (4-134)	Nadeem Afana
242	8	Aug 12, 2020	8.7.3. Elastic vs Inelastic Scattering: We are assuming no potential energy is involved in interactions, so no kinetic energy is converted into potential energy (or vice versa). This assumption is implied throughout the text.
290	11	May 26, 2020	After (11-21): change “is not symmetric, and there is” to is symmetric, but for real A^mu, there is effectively - After (11-22): change the entire sentence to the following: - By doing Prob. 3, you can show that the free e/m Lagrangian in (11-8) is not symmetric, and thus there is no conserved current. -	Josef Springer
296	11	May 26, 2020	Equation (11-39): everything after “arrow m²” until the non-equal sign should be in parentheses	Josef Springer
149,153	5	April 14, 2020	See Changes to Chap 5 for correction of an oversight by me, the author, plus a pedagogic improvement.	Francesc Mir
520	19	Nov 7, 2019	Under Supersymmetry sub-heading, 3^rd line, change “Lagrangian” to “action”. In SUSY, there is a little wrinkle here. See Aitchison, (footnote ref 3 on this page 520), pg. 46 (eq (3.34 there) and pg. 60 , 2^nd paragraph there).
283	10	Sept 3, 2019	This change is for a section of the book I recommended new students of QFT avoid for now. See Change to multiparticle creation operator	Francesc Mir
213c	7	Aug 13, 2019	Problem 2: Add the sentence “It can help if you use α and β as dummy indices in (7-8) instead of μ and ν.”
256 et al	9	April 22, 2019	See some corrections to Chap. 9 at Chap 9 Corrections	王旺生 Wangsheng Hunan
329	13	April 4, 2019	This is not a correction, but a note of interest. The first direct, experimental evidence for light-by-light scattering was found at CERN and reported in early 2019. See https://phys.org/news/2019-03-atlas.html
275, 276, 282, 283	10	Sept 20, 2018	See Chap 10 corrections which gives a page you can print, then cut and paste corrections into the text. The changes to Wholeness Chart 10-2 may not be so relevant to QFT newcomers, as that chart is only recommended for veterans of the subject.	Ezequiel Lozano

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Minor Corrections (should not impact learning process)

Pg	Chap	Date Posted	Minor Correction	Reported by
514	19	Sept 5, 2022	Line after equation (19-5): Change P_f and P_i to Σp_f and Σp_i	Josef Springer & Luc Longtin
171	6	Sept 2, 2022	The footnote: Add the following at the end. “These references derive (6-22) in slightly different form. With Chap. 5 of Vol. 2 of SFQFT and www.quantumfieldtheory.info/Spinor_Lorentz_transf.pdf, one can deduce (6-22).
327b	13	Feb 18, 2022	(13-32)+7, 2^nd row: Before the last parentheses, insert a summation over r.	Mikhail Denisov
236	8	Jan13, 2022	Box 8-3. B.4. e) and f): switch order of r and mu to match everywhere else.	Nadeem Afana
290	11	Jan13, 2022	(11-18): change == to =	Nadeem Afana
300	11	Jan13, 2022	(11-49), 1^st line: Remove right parenthesis at end of line	Nadeem Afana
370	14	Jan13, 2022	Wholeness Chart 14-5, mid page, 1^st block: change == to =	Nadeem Afana
400	15	Jan13, 2022	(15-141) to (15-143): delete all of the { signs ((4 of them)	Nadeem Afana
400	15	Jan13, 2022	(15-140), just after arrow: change ln(1)z to ln((1)z)	Nadeem Afana
420	16	Jan13, 2022	The line above (16-75): change the first word from “spin” to “spinor”	Nadeem Afana
499	18	Jan13, 2022	1^st paragraph, 6^th line: After “Here”, insert comma	Nadeem Afana
500	18	Jan13, 2022	4th line after (18-34): xL > x1 > xR. should be xL < x1 < xR.	Nadeem Afana
514	19	Jan13, 2022	Feynman’s Rules B.4. e) and f): switch order of r and mu to match everywhere else.	Nadeem Afana
261	9	Jan 11, 2022	(9-14), 2^nd row, last part: put a slash through “k”	Mikhail Denisov
411	16	Jan 11, 2022	(16-33): T in first integral should be tau.	Luc Longtin
470	17	Jan 11, 2022	(17-132): closing parenthesis must be moved from end of 1^st row to end of 2nd row.	Mikhail Denisov
471	17	Jan 11, 2022	Sect. 17.5.3, first line: Replace positrons with electrons	Mikhail Denisov
473	17	Jan 11, 2022	(17-142), 1^st line: Remove absolute value signs.	Mikhail Denisov
521	Index	Sept 14, 2021	Insert, after “barn, 434”, - beta function, 317-
46	3	Aug 27, 2021	(3-26) after first equal sign: parentheses should be absolute value bars	David Scharf
7	1	Aug 27, 2021	Last box on lower right hand side: Change “4” to “7.4.4”	Chris Gordon
22	2	June 24, 2021	2^nd margin note is cut off at bottom
25	2	June 24, 2021	2^nd line on page need a closed parenthesis at end.
89	4	June 24, 2021	Footnote on page, last line: Add “s” to the end of “reference”
463, 465	17	June 24, 2021	Eqs (17-100), (17-101),and (7-111) under and over brackets are upside down
219	8	Nov 17, 2020	Box 8-1, under section “Virtual Particles Not So Limited”, end of 2^nd paragraph. Change “not fleeting and virtual” to not virtual (not fleeting) -	Nadeem Afana
228	8	Nov 17, 2020	Eq (8-58), 2^nd line: E_p” should only have one prime on the p	Nadeem Afana
193	7	Oct 27, 2020	Wholeness Chart 7-2, last column, Heisenberg Picture row: the comma between the operator O and its superscript H should be moved to just after the superscript H.	Nadeem Afana
194	7	Oct 27, 2020	Sect. 7.3.12, 2^nd line: “i..e,” should be “i.e.,”	Nadeem Afana
195	7	Oct 27, 2020	(7-45): the symbolism using a subscript for position space is not introduced until (7-77) on pg. 203, so (7-45) should have x₁ and x₂ as arguments of the fermion and photon fields.	Nadeem Afana
196	7	Oct 27, 2020	(7-49): In the first row, the under bracket word “eigstate” should be “eigenstate”	Nadeem Afana
196	7	Oct 27, 2020	Sect 7.4.3, 2^nd paragraph, 3^rd line: insert a comma after “Further”	Nadeem Afana
201	7	Oct 27, 2020	(7-68): The arguments for script H_I^I should include 3D positions x₁, x₂, …,x_n as well as time.	Nadeem Afana
213	7	Oct 27, 2020	(7-116), last line: The arguments for script H_I should include 3D positions x₁, x₂, …,x_n as well as time.	Nadeem Afana
192	7	Oct 12, 2020	Eq (7-41): in middle of equation, double equal sign should only be one equal sign	Nadeem Afana
522	Index	Sept 2, 2020	After “fine structure constant”, add - 14 -
522	Index	Aug25, 2020	Under “field” add, - unobservable, 189 -
93	4	Aug 13, 2020	Eq (4-39): As each of the Sigma relations is separate (they are not multiplied as it might look at first), insert commas between them.	Nadeem Afana
497	18	Aug 13, 2020	Footnote 1: Since writing this, I have investigated the issue and now realize that paths backward in time destructively interfere and do not survive in the classical limit. Thus, Dyson’s quote is accurate. To keep things simple and avoid confusion, PI analyses generally look at paths forward in time, but they could equally well include those backward in time.
454	17	Aug 12, 2020	Eq (17-45): “state N_f” should have a sub-sub-script on the “f” of ”1”.
525	Index	Aug 12, 2020	Insert reference above “S matrix”: “Rutherford scattering, 479”
526	Index	Aug 12, 2020	In “scattering”: insert “Rutherford, see Rutherford scattering”
484	17	May 26, 2020	In first column, block 11a: remove period under “11a”	Josef Springer
508	18	May 26, 2020	Wholeness Chart 18-5, last row, 2^nd column: after “Section 18.7.2”, insert - , pg. 498 -
106	4	March 9, 2020	5^th line down on page: add an “s” to “represent”	Leonard Carter
116	4	March 9, 2020	Under “The First Issue” section, next to last paragraph, last sentence. Delete “cover over and”. (The language is a little confusing and it is clearer without it.)	Leonard Carter
522	Index	Feb 21, 2020	Under Feynman diagram, add a subheading “lines represent waves, 238”
160	5	Jan 17, 2020	3^rd line from bottom: “spinor” should be “polarization”
50	3	Jan 9, 2020	Footnote: The title of the first article “A symmetry for… Energy” has been changed to “Mechanism for Resolving Gauge Hierarchy and Large Vacuum Energy”
71	3	Jan 6, 2020	3rd line of 3rd para., "the operator field" should be - the field operator - . Two places.	Leonard Carter
72	3	Jan 6, 2020	Paragraph right after (3-119), 4^th line down: Change ”and the amplitude …being HF.” to - and part multiparticle state (scalar plus anti-scalar) with the amplitude of that part being HF. -	Leonard Carter
88	4	Jan 6, 2020	5^th line up from bottom: change “an” to - a -	Leonard Carter
492	18	Nov 12, 2019	Sect 18.4.1, 3^rd line. “section” should be capitalized.
494	18	Nov 12, 2019	Footnote 2: Add a period at the end.
501	18	Nov 12, 2019	Sentence above (18-38), at end, add “(where C is used for C)
501	18	Nov 12, 2019	Last side note: put “(but” on next line for balance.
503	18	Nov 12, 2019	Footnote: after “is a straight line”, add plotted vs x_f . Insert horizontal before “straight”. change “with “ on second line to since it has
507	18	Nov 12, 2019	3^rd line up from bottom, after “18-2”, insert pg. 498
x		Nov 9, 2019	Acknowledgements for 2^nd edition: Ezequiel Lozano should have been included.
215	8	Nov 7, 2019	In (8-3) under brackets are upside down. Printing glitch in book. Original file from which book printed is OK.
217	8	Nov 7, 2019	In (8-13) Under brackets are upside down.
218	8	Nov 7, 2019	In (8-18) under brackets are upside down.
415	16	Nov 7, 2019	Third paragraph down, underline “subscript “mm””.
500	18	June 7, 2019	Eq. (18-35), 1^st row: delete extra + sign in exponent
521	18	June 7, 2019	Index. after “action”, insert “18-21”, and after “493”, insert “520”
524	18	June 7, 2019	Index. “Lorentz condition” and “Lorentz gauge” are out of alphabetical order. Also, insert “Lorentz group, 171”
507	18	June 7, 2019	Wholeness Chart 18-4, Part 2, row headed “Operators”, last column: instead of “t”, should be “(and rarely) x,y,z,t”
x		June 5, 2019	Acknowledgements for 2^nd edition: Michael Heiss is listed twice.
184	7	Nov 2, 2018	2^nd line after (7-6): delete the period between “e” and “j”.
285c	10	Nov 2, 2018	Section 10.13.3, 1^st line: change underline between “group” and “at” to a space.
108	4	Sept 20, 2018	Footnote: “article” should have an “s” on the end.
219	8	Sept 20, 2018	Title in top margin should have “(1)” as superscript.
285c	10	Sept 20, 2018	Footnote 7: Insert quote mark after “Experiment”.
308	12	Sept 20, 2018	(12-10) last line and (12-11): Underbracket phrase “self energy” should have hyphen between “self” and “energy”.
412	16	Sept 20, 2018	(16-38): Computer/printing glitch (correct in prior versions of text). Backward part of first parenthesis should be forward facing.

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