# "Of making books there is no end, and much study is a weariness of the flesh." -- Ecclesiastes 12:12

I have only just started this errata page so please be patient if you have already sent me something.

Warning: While I have checked most of the entries listed here, I simply do not have time to check them all. Thus, there may well be an erratum to an erratum. If you find, please email me.

Errors, typographical and otherwise, in Einstein Gravity in a Nutshell are listed here. Readers who find errors are urged to bring them to my attention by email (zee@kitp.ucsb.edu) using the following format. I would appreciate it if you would write them in exactly the same format as used here. Please do not send errata in some other format, such as a pdf of a list of errors.

If you find a erratum, please send it to zee@kitp.ucsb.edu in the following format:

1. Use [Einstein Gravity Errata] in the subject.

2. Specify the page number, the line number (or describe the position of the erratum in the page eg. top, middle, bottom, which will help people to navigate.) and the erratum. Notation: Line –n means line n from the bottom of the page.

3. Your name if you wish to be thanked.

Thanks for following this format.

Please check to see if the errata you found are not already listed here.

I have only started this page on September 19, 2019, and I have many other commitments. Thus, I may not get to your erratum for quite some time.  If you feel that the erratum you sent in is particularly serious, please email me again and say so. Thanks.

My intention is to produce a functional errata page that would help the reader understand the material, rather than a nice looking errata page that is perfectly formatted and ordered, free from repetitions, etc. On the other hand, if you find a significant error on this errata page, of course I would appreciate your letting me know.

One thing that is useful for me to know is how complete the index is. If there are items in the index that you feel should be there but are not, please let me know.  Most people do not know that the index is not prepared by the author but by a professional index compiler who often knows almost nothing about the subject of the book.

I would also like to take this opportunity to thank all of you who sent in errata, particularly those who also posted a favorable "Customer Review" on Amazon.com. Appreciative words from readers make the enormous effort that went into writing a book like this worthwhile.

Errata

 page line errata thanks to 78 eq(24) coefficient of the d(theta)^2 term should read (f^2(cos(theta))^2+ r^2(sin(theta))^2 79 Q4 the coefficient of the d(r)^2 term should read (rho)^2/((rho)^2+(a)^2(sin(theta))^2). 165 problem III.1 Remove the words "head-on" from the problem. Landon Lehman 277 in the paragraph above Eq. (7) and in Eq. (7) itself the definition of the proper time d\tau^2 should contain an additional minus sign. Dennis jespersen 303 In the approximation to Newtonian Gravity it seems as if we ar: sudden switch to the (+1,-1,-1,-1) metric.  The final result disagrees with eqn 40 on page 861 (the collection of useful formula).  The error seems to start with the signs for the two Christoffel Symbols in line 5. 429 Fig. VII.2.7 where the labels on regions III and IV should be switched Dennis jespersen 466 eq. (24), where the first parenthesized term on     the right-hand side should have a, not a^2. Dennis Jespersen 493 before (15) Sign errors, T=-\rho+3P, and hence a relative + sign between the two terms in S_\mu\nu. Steve Meek 569 line after eq(16) Replace $Q^{ij}$ by $D^{ij}$ 569 line after eq(16) Replace $Q^{ij}$ by $D^{ij}$ and quadrupole'' by second'' 571 middle Replace We learned .... have one.'' by To calculate the energy carried away by the gravitational wave, we have to derive the analog of the Poynting vector in \esm~in \en~\g. Then, after integrating over angles, we find that the energy radiated per unit time is given in terms of the quadrupole moment $Q^{ij}(t) \equiv D^{ij}- \frac{1}{3} \del^{ij} D$ with $D = \del^{ij}D^{ij}$ the  trace of the second moment. (We do not carry out this rather tedious calculation here. See, for example, M. Maggiore, Gravitational Waves, vol. 1.) A spherically symmetric mass distribution simply does not have a quadrupole moment.'' 571  middle  Replace We learned .... have one.'' by To calculate the energy carried away by the gravitational wave, we have to derive the analog of the Poynting vector in \esm~in \en~\g. Then, after integrating over angles, we find that the energy radiated per unit time is given in terms of the quadrupole moment $Q^{ij}(t) \equiv D^{ij}- \frac{1}{3} \del^{ij} D$ with $D = \del^{ij}D^{ij}$ the  trace of the second moment. (We do not carry out this rather tedious calculation here. See, for example, M. Maggiore, Gravitational Waves, vol. 1.) A spherically symmetric mass distribution simply does not have a quadrupole moment.'' 601 the last term in equation (12) should have a positive sign before it. This makes it cancel with the last term in equation (13) below it, upon addition. Vivek Saxena 795 bottom in the solution for I.5.17, there is a sentence "In other words, we have two equations giving \partial_y f and \partial_y f...". The second one should be \partial_y g. Christopher Jones 801 The solution to Exercise V.2.1 should be \delta = GMhR^{-2} - R\omega(v) - v^{2}/2 and \delta_{ew} = -2R\omega(v). Maxwell I. Scherzer 245 third line after Eq. (18) "With the identification in (17), we obtain dp^1/dtau=...". The last term in the inline equation for dp^1/dtau should have a minus sign so that it can be recognized as the cross product of Eq. (19). The typo probably comes from the fact that F_{13}= -B^2 and not B^2 (because of the antisymmetry of F^{\mu\nu}. Jacques C.R. Bloch
last update 9/23/2019