Entropy Increases (All Else Being Equal)

Christopher H. Bidmead : Script Editors' Note to all Writers - 12 June 1980

The Doctor's Adventures in E-Space

Distinguish between the Charged Vaccuum Emboitment through which the TARDIS passes, and E-Space where the adventures take place. Mathematically, perhaps, E-Space is inside the CVE, but for our purposes we had better think of them as the mouth of the bottle and the bottle itself.

The Charged Vaccuum Emboitment

Experimental observation shows that matter and anti-matter can be created inside a vaccuum subjected to a strong electromagnetic field.  Twenty-first century physics has also discovered that in some extremely rare circumstances the same conditions can create a charged vaccuum within a charged vaccuum, and that theoretically at least an almost infinite regression (and almost infinitely improbable) regression of charged vaccuums can be nested inside each other like Chinese boxes. This 'emboitment' leads through to an independent universe (E-Space) that is in all other respects completely isolated from the one we know and the TARDIS has accidentally verified this theoretical finding by falling right into it!

Such Charged Vaccuum Emboitments (CVEs) differ from Black Holes in being considerably rarer as space-time events, and in having absolutely no effect on space in the immediate vicinity. Because they exert no gravitational force, it is possible (unlike Black Holes) to pass right by them without even being aware of them. The TARDIS and her crew have therefore been very unlucky indeed!

The Nature of the Other Universe

The Doctor and Co. are in E-Space (or more fully, the Exo-Space/Time Continuum), which lies outside the finite but boundless Space/Time of Einstein (N-Space). The TARDIS has undergone a negation isometry - that is to say the space in give it now finds itself has negative coordinates with respect to our own familiar universe. The mathematics of the CVE suggest that this new world has an equal probability of being composed of matter or anti-matter; but it's nature in this respect is not really an issue : anti-matter itself may be fairly familiar to twenty-first century physicists. The major problems, in inverse order of importance, are :

1) Because of the relative smallness of E-Space (there are only two galaxies) the TARDIS behaves with unpredictable reliability, especially on short temporal or spacial hops.

2) The Laws of Physics in this universe operate in familiar ways, but may not be one hundred per cent trustworthy.

3) Romana and the Doctor are trapped, unless they can find another CVE.