Article in Journal of the British Interplanetary Society · February 012 Source: arXiv citations 23 reads 4,982 author: Some of the authors of this publication are also working on these related projects

85
Advanced Space Propulsion Based on Vacuum (Spacetime Metric) Engineering
11 1
g
−
<
objects would expand - thus the fourth entry in Table 1 of physical effects.
3.3
Velocity of Light in Spacetime-Altered Regions
Interior to a spacetime region altered by, say, a dense mass
(e.g., a black hole, the locally-measured velocity of light c in,
say, the x
1
= r direction, is given by the ratio of locally- measured (proper) distance/time intervals fora propagating light signal [13]
11 00
i
L
g dr
v
c
g dt
−
=
=
(6)
From a viewpoint exterior to the region, however, from the above the remotely-observed coordinate ratio measurement yields a different value 11
e
L
g
dr
v
c
dt
g
=
=
−
(7)
Therefore, although a local measurement with physical rods and clocks yields c, an observer in an exterior reference frame remote from the mass speaks of light slowing down on a radial approach to the mass due to the ratio 11 1
g
g
−
<
Conversely, under (metric engineering) conditions for which
00 11 1
g
g
−
>
the velocity of light - and advanced-technology craft velocities that obey similar formulae – would appear superluminal in the exterior frame. This yields the fifth entry in Table 1 of physical effects.

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