Corrections to

 Sept 2018 Revision of

Solutions to Problems for Student Friendly Quantum Field Theory

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Pg

Date Posted

Significant Correction

Reported by

(blank = the author)

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

14-4

Nov 11, 2024

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

Albert Clement

6-7

Sept 21, 2024

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

Albert Clement

8-16

Sept 21, 2024

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

Albert Clement

13-2

Sept 21, 2024

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

Albert Clement

13-1

July 2, 2024

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

Alexis Hardin

5-1

March 30, 2024

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

David Scharf

2-3

Oct 5, 2023

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

6-9

Feb 18, 2022

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

Mikhail Denisov

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

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

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 &-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

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

8-15

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

8-16

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

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