The wider the range of a piece of research the less adequately can any one
worker deal with each of its specialized aspects. Breadth and depth compete for his attention and cannot both secure the whole of it. I am only too
well aware how particularly this truism applies to the study presented here.
The very words 'Unified Cosmology' are both a challenge and a reminder
that every conclusion arrived at has to be consistent with all the facts that
have their appropriate place in every intellectual discipline. No conclusion
here can be considered sufficiently tested by establishing its consistency
with what is known in one branch of science only. Anyone who would
make the most modest contribution to the unification of science should
never claim to be writing specifically as a nuclear physicist, or as an
astronomer, or as a relativist, or as a classical physicist, or as a mathematician, or as any other specialist whatever. When he does so he introduces
a misplaced emphasis. He must never forget that knowledge acquired by
himself in his own particular field of study is not necessarily more relevant,
and may well be less so, than knowledge acquired by others in fields remote
from his own. In order to find means of confirming or falsifying his
conclusions, he must look for facts belonging to every branch of science
to which he can obtain access. He must be prepared some day to be refuted
by facts known to others, but of which he himself is still in total ignorance.
Appreciation of this solemn truth restrained me for many years from
publishing more than a small fraction of the material that is presented in
these pages. It was over thirty years ago that I first came to believe that the
principle called here the Principle of Minimum Assumption deserved to be
applied in the physical sciences with uncompromising consistency. I can
trace this conclusion, or at least its clarification, to the impact made on me
by Eddington's writings shortly after the First World War. Thus stimulated,
I was led to notice how often in physics a scientist would, though perhaps
hardly consciously, apply this principle and how fruitful the result invariably
Among many derivatives of the Principle of Minimum Assumption the
one that soon claimed my particular attention was the one that I have since
called the Hypothesis of the Symmetrical Impermanence of Matter; the
hypothesis that matter is both originating continuously and continuously
becoming extinct. If the Principle of Minimum Assumption was valid, I
saw that all its consequences ought to be explored, including this one, and
that exploration of this hypothesis was likely to lead to new fields for
research. But I did not regard myself as properly equipped for treading
the path that was opening up before me. So I pointed it out to sundry
scientists of my acquaintance in the hope that one or another of them would
examine my suggestion critically. It seemed to me at the time that Symmetrical Impermanence would be difficult, though not impossible, either
to confirm or to refute, but that the attempt to do so would lead to new
insight, whatever the outcome. But none of those with whom I sought
personal contact seemed to grasp the purport of my questions, and so I
decided to approach a wider public by means of the printed page. I
published the Hypothesis of Symmetrical Impermanence in 19401, though
with a different name and in tentative terms. But still no one attempted to
Nevertheless, I felt encouraged when, some eight years later, Hoyle,
Bondi and Gold published the hypothesis that they called Continuous
Creation, for it agreed with my own view at least insofar as it postulated
the random and causeless continuous origin of matter. Although these
later authors could not accept my contention that a methodologically
sound hypothesis about the duration of matter required that continuous
origin be coupled with continuous extinction, they did help to prepare the
scientific world for new insight into the relation between matter, space,
This led me to return once again to the subject and also to renew my
search for people willing to explore the implications of Symmetrical
Impermanence. As a part of this quest I published a few of my own conclusions. They were necessarily tentative and were presented in the spirit
of invitations to further research rather than as final, well-tested statements
of fact. With these publications I approached a number of noted scientists
and drew their attention to the promise of a solution of sundry problems
that the subject seemed to offer to anyone who might feel inclined to pursue
it, working either independently or in collaboration with myself. But again
I failed to arouse any interest.
Time was passing and I was being forced reluctantly to realize that,
unless I followed up my own suggestion, no one else was likely to do so.
So, some six years ago, I began to give the subject more concentrated
attention, regretting that I had neglected it for so long. But I never ceased
to feel sure that a team would do the job better.
My method had to be adapted to the theme and yet to differ from that
appropriate to research in a less extensive field. It is important to an
understanding of what is presented here that this be appreciated. The aim
of perhaps 90 per cent of all researches is to discover new detailed facts in a
limited field. The starting point is experiment and observation. A collection
of data is found that provides a useful addition to existing knowledge.
Occasionally the research worker finds himself confronted with a puzzling
fact. This gives his work a new direction. An explanatory hypothesis has to
be sought. It is an ad hoc hypothesis and, when found, has to be tested.
If it stands the test, it becomes one of the generalizations of science; a
new law, it is said, has been discovered. This pattern is so recurrent and
familiar that any other is often deprecated. One must always start with a
problem, it seems to be taken for granted, and devote oneself exclusively
to the discovery of a law that will solve it.
Nevertheless, the familiar pattern cannot be applied here. Throughout
the years while the theme of this book has been claiming some of my
attention, it has not been my aim to find explanatory hypotheses. I have
been seeking instead a literal and uncompromising justification in physics
for the famous maxim: hypotheses non fingo. I have wanted, not to discover, but to test. And the assumption that I have sought to test is the
Principle of Minimum Assumption itself.
My method for doing this has invariably been to consider first what
inferences can be drawn from the Principle of Minimum Assumption and
then to test these inferences for their compatibility with established
knowledge. In other words, I constructed in thought the cosmological
model that is implicit in the principle and then compared the model with
actuality. Occasionally there seemed to be a contradiction between the
inferred model and actuality, but further research always removed it. I was
indeed surprised to find how many facts were explained that had hitherto
had to be regarded as among those for which there is no explanation. The
Principle of Minimum Assumption was found, again and again, to render
ad hoc explanations unnecessary. This principle together with the Hypothesis of Symmetrical Impermanence, for which my justification had
initially been purely methodological, came more and more to be also
justified by their explanatory power.
Thus the Principle of Minimum Assumption has withstood every test
to which I have been able to subject it. But if the principle is valid and
universal in physics, it must govern every branch of the physical sciences.
So the tests must continue. Whenever they are successful one may expect
the experience recorded here to be repeated: something obscure will have
been illuminated; new insight will have been gained. I should like this book
to be regarded primarily as a more determined effort than my previous
ones have been to encourage research workers to tread more often than
they now do the path signposted with the word 'Testing' and not all to
crowd along the path with the signpost bearing the legend 'To a discovery'.
Every theme calls for its own most appropriate treatment. When the
theme belongs to a highly specialized field of study there is no excuse for a
research worker who fails to comb the world literature on his theme before
he commences his own research. In the thesis that he prepares at the end of
it he is expected to quote from all the authorities whom he has consulted,
to give a detailed account of the existing state of knowledge on his subject,
to assign priorities where they are due, critically to discuss all previous
theories with mention of the names of their authors and the dates of their
publication, to define precisely the point of view adopted by himself in
relation to that of other workers in the same field.
It cannot be denied that the present study would be more reliable and
better in every respect if I had done all this. But it is manifestly impossible
for a single research worker to do so much when the subject is as comprehensive as it is here. I had to face the dilemma of either presenting something that I knew to be imperfect or of presenting nothing at all. So I
decided that my aim should not be perfection but that I could, nevertheless,
stimulate thought along new lines.
If the author of new theories waits, moreover, until he has found a
satisfactory answer to every question that arises from the theories he will
wait for ever. Would that this were more widely appreciated. It is a common observation that those who dislike a new theory but are unable to
refute it seek only too often to have it ignored by drawing attention to
some problem that remains unsolved. 'No answer has yet been provided
to such-and-such a question', they say. 'And so the theory must be wrong.
It is best forgotten.'
I cannot hope to escape this shallow kind of comment, but I may forestall if it I define the status of my theories as it appears to me. I show in this
book that Symmetrical Impermanence can be justified on methodological
grounds and provides answers to an impressive list of questions in a
variety of scientific disciplines. This does not suffice to prove it true but it
suffices to warrant a serious attempt to answer those questions that arise
out of my theory.
The attempt may lead to falsification of the theory. It has happened
often in the past. But a theory cannot be falsified by showing that it is
incomplete. It is high time that this was pointed out by someone who has
not yet suffered from the kind of criticism that accuses him in effect of not
knowing all the answers. For what constitutes indignation at the way
other men's theories have too often been received in the past may appear
as touchiness about the reception of one's own. This is why I want to point
out that ignoring is no substitute for refuting; and I want to point it out
before, rather than after, it has happened to me.
Some of the problems of presentation that arise from the great breadth
of the subject are worth mentioning.
There was the question how to quote chapter and verse for those
statements for which I could claim the backing of authority. The usual
method is by citations, footnotes, and a comprehensive bibliography. But
for the present purpose I decided to dispense with the ostentatious support
of authority. So long as I avoided any suggestion that the discoveries of
others were my own, I could not mislead by omission of an author's
name and I might do an injustice if, through ignorance, I assigned a wrong
priority to anyone. I have, therefore, been very sparing of references and
footnotes. If anyone says that these omissions prove my ignorance, he will
be right. If he says that they prove my ignorance in some particular instance,
he may be wrong.
But ignorance has not always been my reason for omitting the names of
authorities whose theories I have to refer to. The number of rival theories
seems to be greater in cosmology than in most sciences with the exception
of psychology. In cosmology there also seems to be a tendency to do more
publishing and less critical examining of theories than in most branches
of science. This explains why in the past there have been so many theories
about the sun and the planets, the stars, the nebulae, space and the
universe in general. Each has at one time had the backing of high
authority; it has been widely accepted for a few years or even a few
decades; it has then been rejected because of some rather obvious defect;
another theory has taken its place. Rejection has not always been
based on a more recent discovery; often the defect could have been
noticed at the beginning.
What held for the past holds, unfortunately, for the present day. In
the course of my reading I have met many theories in the field of cosmology
that are quite recent and yet, I am afraid, quite untenable. But they are so
close to my subject that I cannot ignore them. Without extensive research
into the literature of the subject I cannot always know for certain who their
original authors have been, nor whether they still sponsor them, nor how
strong their present backing is. So to quote from the particular passages
that I happened to have found might do someone an injustice. To discuss
such theories while coupling them with the names of particular authorities
would introduce an undesirable polemical note. It would also be unkind.
I have compromised by introducing such theories with some such form of
words as 'one might think for a moment that', or 'the possibility has to be
considered that'. Those who have not met the particular theory before
may be misled into thinking that I have set up a dummy in order to knock
it down; but that is here the lesser evil.
Technical terms caused me some anxious thought. In an investigation
that is limited to a particular branch of science they should always be used.
But those adopted in one branch are unfamiliar to specialists in another,
which has often precluded their use here. For this reason I have, for
instance, spoken cumbersomely of 'the formation of mountain ranges and
depressions', instead of using the neater and more precise geologist's word
'orology', and in discussion of relativity I have found means of avoiding
the term 'invariant'. Sometimes I have deliberately said something in a
way that I know an expert in the branch in question would not adopt. If,
thereby, I risk irritating the expert, I am not likely to mislead him and I
have tried to find the method of presentation that would give a maximum
of information to the non-specialist.
Those parts of the book in which relativity theory has to be discussed
have raised particularly difficult problems of presentation. This is because
only a small fraction of those whom I am addressing here are likely to be
familiar with the mathematics of general relativity, though some of them
may have no difficulty with special relativity. The mathematics is not as
difficult as is often supposed, but the notation is unfamiliar and does not
occur in most other branches of science. Many scientists can do all their
work without ever using this notation. The letter symbols used by relativists constitute a highly condensed kind of shorthand in which one letter
represents a great deal. It need not surprise that those who do not use the
notation daily easily lose sight of the physical concepts for which the letter
symbols stand. Even expert relativists do so sometimes, which explains
why there is still some doubt about the correct physical interpretation of
certain aspects of general relativity. It also explains the occasional reluctance of relativists to give any physical interpretations at all. But here I
have repeatedly found myself obliged to do just this. Interpretations given
by others have all too often failed to secure general acceptance and I
cannot hope for a better fate for mine. From correspondence and conversation I have been led to expect, in particular, somewhat violent
opposition to my claim that, in the relativity equations, the letter symbol
that represents mass must usually be interpreted as representing inert and
gravitational mass only and that great care must be taken to ensure that
the same letter symbol is not wrongly interpreted as also representing
attracting mass. I have written with the express purpose of inviting
critical comment and have to add that, while the majority of those whom I
am addressing are competent to provide critical comment on most of
what is presented here, only a minority of experts in general relativity
are competent to do so about my interpretations of the relativity equations.
It places rather a big responsibility on these few.
I wish to acknowledge valuable help with the presentation of my
material that has been given me by Mr B. C. Brookes and Mr C. R. Howe.
I also wish to acknowledge much scientific advice and information from
Professor Schieldrop of the University of Oslo, to whom I showed an
Chapters I and 2 and passages from other parts of the book in which
space is discussed have been pubhshed in The British Journal for the
Philosophy of Science. I am indebted to the editor and publishers of that
journal for permission to publish them here.
REGINALD 0. KAPP
1. Science versus Materialism, Ch. XXVI
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