We are grateful to M.D. Duez, K. Kyutoku, and Y.T. Liu for reading this article and for providing helpful
comments. We also thank M.D. Duez and F. Foucart for providing the data for plotting Figure 20(a). It is
also a pleasure to acknowledge K. Kyutoku for his special help in completing many of the figures in this
article. This work was supported by Grant-in-Aid for Scientific Research of JSPS (21340051), Grant-in-Aid
for Research Activity Start-up of JSPS (22840010), and by Grant-in-Aid for Scientific Research on
Innovative Area (20105004) of Japanese MEXT.
http://www.livingreviews.org/lrr-2011-6 |
Living Rev. Relativity 14, (2011), 6
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