Chapter 4
Action Principles for Gravity

• Page 115, Eqs. (4.3) and (4.4): the standard definition of the Planck constant was wrong and it should be
  
  
• Page 128, Eq. (4.78): the second index ρ in the second term should be σ:
  

  However, this turns out not to be the convention used in the string literature (see Eq. (16.43)).

  The entropy formula (7.47) changes accordingly (see chapter 7’s missprints).

• Page 148, table 4.1: the last number in the GR column should be -4, so GR is one of the viable theories

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  	GR	Viable	YM	vdH
  c 1	1	2 - λ	2	2
  c 2	2	2λ	0	0
  c 3	-4	-4	0	-4

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