On May 12, 2010, at 2:26 PM, Mc wrote:
"The exponential metric is not Puthoff's idea. It was developed then truncated to fit Einstein's field equations. Even Einstein is quoted saying the exponential metric should of been used. The truncated metric gives an unphysical singularity" Rmc
Yes of course Dicke first wrote it in 1961, but Hal Puthoff has used it extensively in the late 90's in his index of refraction approach - which BTW I am now using Hal's idea to some extent in my idea to increase effective gravity field inside superconducting negative index of refraction metal-material fuselage to make the anti-gravity field for zero g-force warp drive propulsion in vacuum.
The basic coupling should be (index of refraction)^4GNewton/c(vacuum)^4
the superconductor slows light to a stop i.e. index >> 1 & the negative index means that static non-radiative EM fields, e.g. w = + 1/3 in Casimir quantum wells will antigravitate! That is a big bang for small buck. I mean good efficiency in bending spacetime for small amounts of applied EM energy density.
The singularity in the mainstream vacuum Kerr solution is not a problem. (So far no astrophysical charged black holes we don't need the Kerr-Newman solution there, we do need it of course as Bohm hidden variables (dual to strings) on the hadronic scale and perhaps as models for quarks.