Due to a failure of the recording equipment the following is
the reconstruction of the interview of Prof. Cyril Domb by S.S.
Schweber on June 10, 2002 in Prof. Domb's apartment in Jerusalem,
from the notes taken by S.S.S.
I was born on December 9, 1920 in London into an orthodox Jewish
family that had emigrated from Galicia, Poland. My mother's parents
were very influential in my upbringing. My parents were of modest
means and I attended an ordinary public school for the first six
years of elementary school. I had there an extremely good teacher
 by the name of Mr. Abrahams  who spotted that I had an aptitude
for mathematics. He tutored me and taught me a little calculus.
I am very grateful to him. I went to Hackney Downs secondary school.
Hackney Downs was not a "fancy school". Fancy schools
trained their students for scholarships to go either to Cambridge
or Oxford after matriculation Fred Hoyle, who I met later, called
the products of the fancy school "trained greyhounds."
But the school had an outstanding mathematics teacher  F.J. Swann
who gave me the books needed to study for the mathematics examinations.
I had a scholarship that allowed me to get along very well and thus
I could study free of concerns. The 6th form is usually a two year
course and one takes the examinations at the end of the second year.
But Swann suggested that I take the December examinations  which
I did. To get a scholarship one usually needed to do well on 6 out
the 10 questions. I had studied the geometry books of Winchester's
famous math teacher, Clement Durell, and I did very well on the
geometry questions of the exam  well enough to be awarded a fellowship
to Pembroke. I went up to Cambridge  Pembroke  in October 1938.
The head tutor at Pembroke, Wynn, was a clergyman who was very helpful.
He could have excused me from the College as I was an observant
Jew  but he felt that it was important that I partake of that
part of College life. I did so as he arranged that I would get vegetarian
meals.
During my first year at Cambridge my tutor was Stoneley, a quite
good geophysicist who later became a FRS. I took a course in linear
algebra from Philip Hall  and his lectures were so outstanding
that I used my Pembroke notes for the course on linear algebra that
I gave at Bar Ilan a few years ago. I got a first class for the
work during my first year at Pembroke. World War II broke out in
September 1939, just before I started my second year at Pembroke.
That year I worked mostly by myself and at the end of the year I
took the math tripos and did very well ; I finished as a wrangler.
During my third year I attended mostly graduate lectures. I listened
to Dirac, whose presentations were the same as his book. Eddington,
whose lectures on general relativity I attended, was a poor lecturer.
I studied wave mechanics from Frenkel's book and statistical mechanics
from Fowler's book. Incidentally, Fowler was around but was doing
war work. I did reasonably well in part III and graduated from Cambridge
in the summer of 1941. As the war was on, Stonely said to me "To
do something for the war effort you should do applied mathematics
and return to pure mathematics after the war is over.
I graduated from Pembroke in June 1941. In July I joined the research
group on radar at the Admiralty Signal Establishment (ASE)in Portsmouth.
Since there were no "theory" groups at ASE I was appointed
as a temporary experimental assistant and assigned to do practical
work. Also assigned to the experimental group was Fred Hoyle. Since
both of us were particularly inept with a soldering iron we were
sent off to a hut on the outskirt of the ASE and told to concern
ourselves with theoretical matters. Hoyle was 26 at the time and
a Junior Fellow at St. John's in Cambridge. He had an "ebullient"
personality and was very original. His area of research was astrophysics
and he tried to convince me to become an astrophysicist. He did
not succeed as I was then already persuaded that my own interests
were in statistical mechanics and solid state physics. Incidentally,
Hoyle did not switch off thinking about physics during the war.
Meeting him, working with him was a "very significant point
in my career." Herman Bondi joined the group in April 1942
and soon thereafter Tommy Gold did so. It was then reconstituted
as a "Theoretical Group" with Hoyle as its head and Bondi
as deputy. Both Bondi and Gold were born in Austria and had emigrated
to England. Both had gone to Cambridge where Bondi had distinguished
himself. After the war had broken out both had been interned on
the Isle of Man as enemy aliens but were released when their scientific
skills and their political views were brought to the attention of
the proper authorities by Hoyle. Bondi was a superb mathematician,
in contrast to Tommy Gold who was less adept at mathematics but
was a superb physical thinker as well as a very good experimentalist.
Tommy had three great ideas while at ASE: he designed a screwdriver
with a ratchet; later, working with Pumphrey, a fine biologist who
worked at ASE, he devised various experiments which helped decipher
how the human ear works and corroborated that Helmholtz' view that
the ear could be modeled by highly resonant circuits was probably
correct; and together with Bondi and Hoyle came up with the idea
of the steady state universe. I might mention that all four of us
were eventually elected FRS (Fellows of the Royal Society).
One of my first researches at ASE stemmed from a problem that had
been posed to Fred Hoyle by the Navy. Receivers operating with 7
meter wavelength radar could detect enemy aircraft at a satisfactory
range but there was no indication of their height. Could a method
of height estimation be suggested. Hoyle devised a practical, successful
solution. When shorter wave length radar became available a new
method had to be devised which required a simple and accurate calculation
of the field strengths at any given height above the surface of
the earth of the radiation emitted by a radar transmitter. G.N.
Watson had solved the problem of the diffraction of an electromagnetic
waves by a sphere of radius R. His solution was valid for R being
greater or smaller than the wavelength of the radiation, but could
not readily be used for practical calculations of the propagation
of electromagnetic waves around the earth. M.H.L. Pryce  who had
joined the ASE at the same time as I had and whom I met a few months
thereafter  had produced an elegant and useful perturbative solution
in the case in which the dependence of the field strengths on the
electrical characteristics of the earth is negligible. In particular,
for wave lengths from the infrared up it is then to correct to calculate
as though the earth or sea were a perfect conductor. He had suggested
that for diffraction around the earth an effective and justifiable
approximation consisted in using a metric that took into account
only terms to first order in the curvature. Solving Maxwell's equations
with this metric led to solutions expressed in terms of Airy integrals.
Pryce sent me to J.P.C. Miller at Liverpool University to compute
values of the Airy integral for complex values of its argument.
Miller had tabulated the values of the Airy integral for real values
of its argument, but Pryce's solution required its values along
certain lines in the complex plane. I completed the calculations
and Pryce and I produced a set of curves from which the field strengths
at any distance from a radar transmitter could readily be derived.
It was a very useful introduction to getting numerical answers from
series expansions. I wrote up our joint work as an A.S.E. report
in September 1942. It was circulated on both sides of the Atlantic:
in the UK and in the United States and the curves that were featured
in the report were widely used. After the war I rewrote the report
for publication in the Journal of the Institution. It appeared in
Volume 94, Part III, No. 31, in the September 1947. Its title was
"The Calculation of Field Strengths over a Spherical Earth."
The Admiralty sent us a letter of appreciation upon its publication.
I got engrossed in probability theory through my work at ASE. I
there became interested in the scattering of electromagnetic radiation
from rain clouds. And in particular the scattering of em waves with
wavelengths from 3cm to 1 meter (radar), as well as longer radio
waves. When the spacing between the raindrops is large compared
to the wave length of the radiation the droplets can be treated
as random scatterers, whereas when the wave length is large compared
to interdroplet separation the cloud should be treated a continuous
medium with a dielectric constant different from 1. Can one describe
the transition from the"incoherent" regime to the "coherent"
one? Consideration of this problem led me to the study of a special
type of random walk, and to my first scientific publication: "The
resultant of a large number of events of random phase". Proc.
Cambridge Phil. Soc. 42(1946): 245249. Coulson criticized the paper,
but in a reply to his objections (Proc. Cambridge Phil. Soc. 43(1947):
587589 )I showed that the formula I had derived was adequate for
the applications with which I had been concerned. Working at ASE
is what initiated me to problems in probability, and probability
became central in my scientific concerns. Bondi did a lot of important
work on the statistical distribution of noise in radar receivers
which I studied carefully. He and I were supposed to write a book
on noise  but it never materialized.
In June 1945, after the defeat of Nazi Germany, Fred Hoyle went
back to St. John's in Cambridge. After VE day Bondi returned to
Trinity and Gold eventually received a Trinity fellowship based
on his work with Pumphrey. Unfortunately I had nothing specific.
Pembroke College however came through. a very able physics graduate
student , Efraim Nahum, had been killed during the only aerial bombardment
of Cambridge during the war and his parents had established a scholarship
at Pembroke. The College awarded me this scholarship. Money had
accrued for three years and it turned out that the amount was enough
to support me from January 1946 till September of that year  at
which time it was hoped that I would be awarded a government grant.
At Cambridge I was a graduate student in the mathematics department
as theoretical physics was part of that department. The post World
War II restructuring of British physics departments to include theoretical
physics as an important subdiscipline that was initiated by Peierls,
Otto Frisch and others who had been involved in wartime research
in the United States had not as yet taken place at Cambridge. When
I came back to Pembroke I started immediately doing research. I
did not go to any lectures. I first worked on the statistics of
particle counters, an area where the knowledge and techniques I
had acquired at ASE about Laplace transforms analyzing circuits
came to good use. This work resulted in several publications [ papers
36 of part VII Stochastic Processes of my CV] and initiated an
important area of research for me. I also got very interested in
lattice dynamics during my time at Pembroke.
Fred Hoyle had agreed to become the supervisor of my Ph.D. dissertation
even though statistical mechanics was not one of his active fields
of research. At the time he was giving the university lectures on
statistical mechanics Fowler having died. I decided to explore what
had been done in phase transitions and studied Fowler and Guggenheim's
Statistical Mechanics (1939) and read papers by LennardJones on
and Devonshire on melting. The books which influenced me the most
were J. Frenkel's Kinetic Theory of Liquids which Oxford University
Press published in 1946 and Schrödinger's Statistical Thermodynamics
which Cambridge University Press published that same year. I read
both of them from cover to cover. Schrödinger's little book
was amazingly lucid and enlightening and complemented beautifully
Frenkel's critical exposition. Frenkel gave insightful assessments
of what had been done and needed to be done in many areas of what
is now called condensed matter physics.
The Cavendish in 1946 was a very exciting place as both staff and
students were coming back after a prolonged absence. Among those
returning were Brian Pippard, Martin Ryle, Denys Wilkinson and Tommy
Gold. The Kapitza Club as well as the 2V Club resumed their meetings
and I attended the lectures presented there. In fact it was a lecture
by A.R. Miller at the 2V Club that started me off on my thesis researches.
Miller, who was a student of Fowler's, lectured on the Bethe approximation
and its application to polymers and other systems. It became apparent
to me that for one dimensional spin systems I could solve the problem
exactly. I developed the formalism using transfer matrices only
to discover that I had been anticipated by Kramers and Wannier,
and by Montroll who had written papers on the subject in 1941. a
further search of the literature led me to Onsager's 1944 paper
and to the 1945 Reviews of Modern Physics paper by Wannier. Incidentally,
in July of that year the first postwar International Physics Conference
took place at the Cavendish. It was devoted to a review to the state
of knowledge in "Fundamental Particles" and in "Low
Temperature." In the opening session of the conference Bohr,
Pauli, Dirac and Born addressed the difficulties that had been encountered
in relativistic quantum field theories. The speakers at the session
on low temperature physics were Fritz London, Kurt Mendelssohn ,
V. Peshkov and Lars Onsager. I did not understand what Onsager was
presenting in his talk on "Transition points". But by
the time I read the Proceedings of the conference I had studied
both his 1944 paper and the one he later wrote with Bruria Kauffman
and I was awed by what he had done and admired his work immensely.
Onsager's solution worked only for one particular model , and reliable
methods were needed to derive the properties of the many other models
of interest. I derived transfer matrices for a host of problems
 including the three dimensional Ising model. They all could be
reduced to a simple characteristic form with a large numbers of
zeros. Philip Hall, whom I consulted about their properties, convinced
me that obtaining exact diagonalization was very difficult. Given
my experience from ASE I then investigated how series expansions
of the partition function at high and low temperature could be used
to obtain information about critical behavior. I first investigated
series expansions for the two dimensional Ising model in the absence
and presence of a magnetic field, and later did the same for other
models. This became my PhD dissertation. It was finished in 1948
and I submitted it in 1949. Rudolf Peierls was the external examiner
and at the examination he asked me " What happens to the Onsager
solution when you have a magnetic field present?." For the
zero field certain simplifications obtained and I could derive all
the coefficients of the series expansions. But for the nonzero
case the situation was very much more complicated and I could only
obtain the first few coefficients of the series but this allowed
me to estimate the critical behavior of the magnetization. By examining
the behavior of the series in the zero and in the nonzero field
cases I conjectured that there were no singularities of the partition
function for the nonzero field case. Yang and Lee proved this result
rigorously in 1952.
I might add here some general observations. My thesis already noted
the equivalence of various systems in so far as their critical exponents
were concerned. See my 1949 Royal Society paper. [Papers 1 and 2
of II Ising and Heisenberg Model of my list of publications.] The
Ising model was not very popular at the time: It was the Heisenberg
model that was considered interesting. The Onsager solution was
thought to be a mathematical curiosity. The orderdisordered model
was considered "real".
In 1948, as a result of a sudden change of governmental policy,
the Senior Research Award from the Department of Scientific and
Industrial Research which supported me was terminated after two
years  the normal duration for them was three years. As I had
not applied for any alternative means of support I was facing a
very difficult situation. Fortunately it turned out that Maurice
Pryce had just been appointed to a newly established Wykeham Chair
in Theoretical Physics at Oxford and that Stanley Rushbrooke had
been appointed to a readership in theoretical physics there. Rushbrooke's
area of research was statistical mechanics and he was a well established
figure in that field. I went to Oxford to give a lecture and to
inquire whether there might be a place for me there. As there were
a large number of students wanting to do theory and given that I
had many problems in series expansions that looked promising and
because Rushbrooke had thought well of my work and lecture  he
had not thought of series expansions  Pryce managed to get me
an IC Fellowship. At the beginning of 1949 I moved to Oxford.
Simon who was the effective head of the Clarendon was a great influence
on me. Lord Cherwell (F.A. Lindemann)was nominally the head but
he was in London throughtout the week in the House of Lords, and
in fact I never saw him during my entire stay at Oxford. Simon was
a benevolent father figure who personally looked after the staff
and students of the Clarendon. He was an experimental physicist
who knew how to use theoretical physics. He felt that experimental
physics "needed guidance." He taught me to be a physicist.
In contrast to Pippard who was terribly critical, Simon at the end
of any lecture that he heard always asked very mundane questions.
It was he who introduced me to members of both the European and
the American theoretical physics community : Born, de Boer, Prigogine,
Onsager, Elliott Montroll...
Simon had a great interest in the physics of melting at high pressure.
In fact Simon had formulated a semiempirical formula for the melting
curve which expressed the equilibrium pressure as a function of
temperature and connected the melting curve with the properties
of the substance, namely the temperature at which melting normally
takes place and the internal pressure of the solid. His interest
in these matters got me involved in solid helium. I wrote a paper
on that subject that was published in the Philosophical Magazine
and I also presented a paper on the problem of melting points at
the 1952 Paris Conference on phase transitions. [ see papers 1 and
2 of part IV Melting in my list of publications.] This 1952 conference
was the second of a number of meetings which became known as Statphys.
Statphys 1 was a small Conference held in Florence in 1949 that
I did not attend as it was by invitation only. But Rushbrooke went
and reported on my work on series expansions. It was at that conference
that Onsager reported on his results concerning the long range order
in the two dimensional Ising model. Rushbrooke told me about them
upon his return. Statphys2 which dealt with phase transitions was
held in Paris in 1952 and Simon saw to it that I get an invitation
to it. De Boer and Prigogine were the organizers and I presented
two papers: one on the three dimensional Ising model and the other
on the theory of the melting curve at high pressures, work that
as I mentioned had been stimulated by Simon's researches. At that
conference there occurred two incidents that left a deep impression
on me. The first was in a session that Rushbrooke chaired. Earlier
that year John Maddox  who later became the editor of Nature 
had announced that he had obtained a solution of the three dimensional
Ising model. Elliott Montroll who had heard about Maddox's claim
thought it important to invite him to present his solution. Simon
then got money for Maddox to come from Manchester to Paris to lecture
on his results. At the Wednesday morning session that Rushbrooke
chaired Maddox presented his presumed solution which consisted in
a three dimensional integral formula, the analog of the two dimensional
integral formula that Onsager had derived for the two dimensional
Ising model. When he was finished and started erasing the board
Montroll said ;"Leave the formula on the board. After Onsager
had arrived at his two dimensional solution he immediately thereafter
conjectured that the solution for the three dimensional Ising model
might be the formula on the board. He tested it by comparing it
with exact series expansions for the partition function, and found
that the conjectured formula gave the first two terms correctly
but failed to reproduce the third. Thus the formula on the board
can't be right and is not the solution to the three dimensional
Ising model." Rushbrooke thereafter suggested that those present
who had a detailed knowledge of the problem should get together
to clarify the situation. Maddox during that subsession discovered
an error in his calculation.
The second incident concerned a presentation by Arnold Munster.
At the beginning of the conference Simon told me that Munster was
presenting a paper in which he claimed that he could prove on very
general, statistical mechanical grounds that all first order phase
transitions end in a critical point at sufficiently high temperatures.
Simon and I had had extensive discussion on whether the melting
curve ends in a critical point at high temperatures above which
there is continutiry of state, similar to the liquidvapor transition.
There was experimental work by Bridgman that showed no indication
of the existence of such a critial point, and Simon himself in 1937
had pointed out that thermodynamic reasoning by itself cannot be
sufficient to decide the matter. I had taken a very firm stand in
the negative. The reason for this stemmed from my studies of the
BraggWilliams model. Solids possess long range order, fluids do
not. The melting point corresponds to the disappearance of long
range order, and bears a resemblance to a critical point. But there
is no possibility of passing continuously from the solid to the
fluid state since long range order cannot disappear continuously;
hence we should not expect a solidfluid critical point. Given my
position it was incumbent on me to defend my views in the light
of Munster's claim. Munster's presentation consisted in a very large
number of slides which he went through at a very rapid pace and
concluded with the assertion: "Therefore every first order
transition must end in a critical point.". Each slide that
Munster had shown had a dense mass of formulae on it  e.g. fluctuation
formulas derived from grand partition free energies  most of which
I had not absorbed, let alone analyzed during the barrage. What
was I to do when confronting him? Fortunately I was sitting next
to Marcus Fierz and I told him of my quandary. Fierz then stated
that Munster was wrong. He pointed out that Munster may have produced
statistical mechanical formulae " But since at no point did
he introduce a specific model his results are of a thermodynamical
nature  and I am quite sure that this issue cannot be proved by
thermodynamics."
Shortly after I came back to Oxford there appeared an advertisement
for a lectureship in mathematics at Cambridge and for a Smithsonian
fellowship which although it indicate a strong preference that it
be held at Cambridge allowed the possibility of staying at Oxford.
Hoyle urged me to apply for the lectureship and Simon for the fellowship.
I applied to both and was successful in both. Since I felt the time
had come for me to get involved in University teaching I accepted
the Cambridge lectureship. Although formally the appointment was
in the mathematics department I had an office in the Mond which
I shared with Dennis Sciama, Oliver Penrose and Aaron Klug. I stayed
in Cambridge from 1952 till 1954. In the fall of 1953 an advertisement
appeared inviting applications for the chair in theoretical physics
at King's College, London. Even though one usually did not apply
for such positions unless there was a hint that one's application
would be welcome I applied. I was on the short list with four others.
It turned out that both Mott and Pryce, who were familiar with my
work, were on the selection committee. I did extremely well on the
interview and I guess that J.T. Randall, the head of the physics
department at King's was favorably impressed for a few days after
the interview I received a letter from him informing me that I had
been appointed to the chair. My inaugural lecture "Statistical
Physics and Its Problems" was an attempt to convey to a lay
audience both the promises and the excitement and rewards of statistical
mechanical understanding.
