Corrections to

 Sept 2018 Revision of

Solutions to Problems for Student Friendly Quantum Field Theory

Sorted by Page Number:  This Page

Sorted by Date Posted:  Click Here

Pg

Date Posted

Significant Correction

Reported by

(blank = the author)

2-3

Oct 5, 2023

Prob. 6, 4^th line down: Change “(xⁱ)” to ““(xⁱ,t)”.

2-5

Dec 29, 2024

Prob 12: Answer 1^st part and footnote: H operator should not have minus sign.

Mikhail Denisov

3-4

Dec 29, 2024

(D): insert minus sign after first equal sign.

Mikhail Denisov

3-6

Dec 29, 2024

Prob 12: 2^nd line after (B): Delete second “not”.

Mikhail Denisov

5-1

March 30, 2024

Prob. 1, first part, 3^rd line: all covariant components k_i should be contravariant components kⁱ.

David Scharf

6-7

Sept 21, 2024

Last line, last factor: put double prime on k_i .

Albert Clement

6-9

Feb 18, 2022

Prob. 15: Corrected solution can be found at Chap. 6 Prob 15 corrected solution

Mikhail Denisov

7-1

Aug 13, 2019

Chap 7, Prob 2:  I was very sloppy with this solution. There are several typos plus I used my own mental shortcut notation, which is quicker when I work alone, but is actually not quite correct and can be confusing. See corrected version Revision of Chap 7 Prob 2 solution.

Roberto Vio

7-4

Oct 12, 2020

Chap. 7, Prob. 6. In the Ans (second part), 2^nd line: the e^-ikx and e^ikx outside and to the right of the brackets should be deleted. In the first underbracket of that row, e^-ikx should have k primed. In the second underbracket, the summation should also be over r.

Nadeem Afana

8-4

Nov 19, 2021

Chap. 8, Prob. 5. In the answer for Part a), delete the identity matrix at the end of the first line.

Jack Freinhar

8-15

Aug 14, 2019

Chap 8, Prob. 15: The subscript r₂ on v_bar should be s₂. 3 places. To avoid confusion with the subscripts on the photon polarizations.

Roberto Vio

8-15 &-16

Nov 19, 2021

Chap. 8, Probs. 15 and 16. In the last line of each solution, delete the factor of 2 in the denominator under the external fermion factor (that has m in the numerator).

Jack Freinhar

8-16

Aug 14, 2019

Chap 8, Prob. 16: The subscripts r_i on v and u_bar should be s_i. 6 places. To avoid confusion with the subscripts on the photon polarizations.

Roberto Vio

8-16

Sept 21, 2024

Prob. 16, 2^nd line from end, LHS: change subscript for positron and electron to 2 gammas to 2 gammas to positron and electron.

Albert Clement

13-1

July 2, 2024

Prob. 2, 1^st line: After “three” insert  topologically different  

Alexis Hardin

13-2

Jan 11, 2022

Prob 13-4, 2^nd line from bottom: A(Λ,m) → infinity should have minus sign before infinity

Mikhail Denisov

13-2

Sept 21, 2024

Prob 5, 1^st line of answer: Change “fermion” to  photon -

Albert Clement

14-1

Nov 11, 2024

Prob. 8, next to last line: All subscript “c” should be “c, nth”.

Albert Clement

14-4

Jan 11, 2022

Problem 14-7. The amplitude M⁽²⁾_B3 should not have a minus sign after equal sign. Same for the modified amplitude in the next to last line.

Mikhail Denisov

16-1

Jan 11, 2022

Prob 16-1: All r = 1 should be r = 2. All r = 2 should be r = 1

Mikhail Denisov

Pg

Date Posted

Minor Correction

Reported by

3-2

Dec 29, 2024

Prob. 3, last equation:, just in front of second equal sign: insert “d³x”.

Mikhail Denisov

3-7

Dec 29, 2024

Prob. 13, 3^rd line: Change apostrophes on k to primes. 2 places.

Mikhail Denisov

4-14

Oct 5, 2018

Third row up from bottom, middle column: The referenced equation (4-29) should be on same row aligned with right margin.

4-17

Sept 21, 2024

Prob. 27, end of last line: change p^i to p (bold)

Albert Clement

6-2

Dec 31, 2024

Prob. 6. Ans. (third part). 2nd line of equation: change “12” twice to “24”.

Mikhail Denisov

6-5

Dec 31, 2024

Prob. 11. Line with Ans. (second part). At the end of the line delete second dot

Mikhail Denisov

7-5

Jan 8, 2025

Prob. 8, beginning of 3^rd line: H₀U₀|ψ > is the same on both sides of the equation, so can be dropped from this point on, and thus, first part of next line can be eliminated.

Mikhail Denisov

8-2

Nov 17, 2020

2^nd line of eq (A): The first E_p term inside the square root should have p primed

Nadeem Afana

8-3

Sept 21, 2024

Chart for Prob. 3, first column, rows 1, 3, and 6: Put a subscript mu on A.

Albert Clement

8-6

Nov 17, 2020

Prob 6-6, 3^rd line: The p in VE_p should be primed

Nadeem Afana

8-9

Nov 17, 2020

Sect. “First Type of Compton Positron …”, 1^st line: delete underline on blank space

Nadeem Afana

8-10

Sept 21, 2024

3^rd line up from bottom: in bracket, change minus sign on e to plus sign. 2 places.

Albert Clement

8-12

Nov 17, 2020

Under bracket on <0||0> is upside down

Nadeem Afana

8-12

Nov 17, 2020

Prob. 9, first line after (P9-1): change “middle” to  innermost -

Nadeem Afana

8-14

Jan 13, 2022

Problem 8-13, 2^nd line of answer: switch order of nu and r to match notation used elsewhere

Nadeem Afana

14-3

Nov 11, 2024

Prob.4: Summation signs have “i” below and “i=7” above. Should be “i=1” below and “7” above.

Albert Clement

14-3

Nov 11, 2024

Prob. 6: Last diagram: Out going arrows (2 places) should be reversed..

Albert Clement

17-7

Dec 31, 2024

Prob. 10. 1^st line of answer: Change subscript on 2^nd Gamma from 1 to 2.

Albert Clement