Sir Hermann Bondi (1 November 1919 – 10 September 2005) was an

Austria Austria, , bar, Östareich officially the Republic of Austria, is a country in the southern part of Central Europe, lying in the Eastern Alps. It is a federation of nine states, one of which is the capital, Vienna, the most populous ...

n- British

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

and cosmologist. He is best known for developing the steady state model of the universe with Fred Hoyle and Thomas Gold as an alternative to the

Big Bang The Big Bang event is a physical theory that describes how the universe expanded from an initial state of high density and temperature. Various cosmological models of the Big Bang explain the evolution of the observable universe from the ...

theory. He contributed to the theory of

general relativity General relativity, also known as the general theory of relativity and Einstein's theory of gravity, is the geometric theory of gravitation published by Albert Einstein in 1915 and is the current description of gravitation in modern physics ...

,Obituaries:
Professor Sir Hermann Bondi
(12 September 2005) in ''

The Independent ''The Independent'' is a British online newspaper. It was established in 1986 as a national morning printed paper. Nicknamed the ''Indy'', it began as a broadsheet and changed to tabloid format in 2003. The last printed edition was publis ...

''.
Professor Sir Hermann Bondi
(2005-09-13) in ''

The Telegraph ''The Telegraph'', ''Daily Telegraph'', ''Sunday Telegraph'' and other variant names are popular names for newspapers. Newspapers with these titles include: Australia * ''The Telegraph'' (Adelaide), a newspaper in Adelaide, South Australia, publ ...

''.
Sir Hermann Bondi
(2005-09-14) in ''

The Guardian ''The Guardian'' is a British daily newspaper. It was founded in 1821 as ''The Manchester Guardian'', and changed its name in 1959. Along with its sister papers ''The Observer'' and ''The Guardian Weekly'', ''The Guardian'' is part of the Gu ...

''.
Sir Hermann Bondi: 1919–2005
(2005-09-14) in '' Physics World'', IOP.
Black hole scientist Bondi dies
(2005-09-17),

BBC News BBC News is an operational business division of the British Broadcasting Corporation (BBC) responsible for the gathering and broadcasting of news and current affairs in the UK and around the world. The department is the world's largest broadca ...

. and was the first to analyze the inertial and gravitational interaction of

negative mass In theoretical physics, negative mass is a type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg. Such matter would violate one or more energy conditions and show some strange properties such as the ...

and the first to explicate correctly the nature of

gravitational waves Gravitational waves are waves of the intensity of gravity generated by the accelerated masses of an orbital binary system that Wave propagation, propagate as waves outward from their source at the speed of light. They were first proposed by Oliv ...

. In his 1990 autobiography, Bondi regarded the 1962 work on gravitational waves as his "best scientific work".

Early life

Bondi was born in

Vienna en, Viennese , iso_code = AT-9 , registration_plate = W , postal_code_type = Postal code , postal_code = , timezone = CET , utc_offset = +1 , timezone_DST ...

, the son of a Jewish medical doctor. He was brought up in

Vienna en, Viennese , iso_code = AT-9 , registration_plate = W , postal_code_type = Postal code , postal_code = , timezone = CET , utc_offset = +1 , timezone_DST ...

, where he studied at the Realgymnasium. He showed early prodigious ability at mathematics, and was recommended to

Arthur Eddington Sir Arthur Stanley Eddington (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician. He was also a philosopher of science and a populariser of science. The Eddington limit, the natural limit to the lumin ...

by Abraham Fraenkel. Fraenkel was a distant relation, the only mathematician in the extended family, and Hermann's mother had the foresight to engineer a meeting between her young son and the famous man, knowing that this might be the key to enabling him to follow his wishes and become a mathematician himself. Eddington encouraged him to travel to England to read the mathematical

tripos At the University of Cambridge, a Tripos (, plural 'Triposes') is any of the examinations that qualify an undergraduate for a bachelor's degree or the courses taken by a student to prepare for these. For example, an undergraduate studying mathe ...

Trinity College, Cambridge Trinity College is a constituent college of the University of Cambridge. Founded in 1546 by Henry VIII, King Henry VIII, Trinity is one of the largest Cambridge colleges, with the largest financial endowment of any college at either Cambridge ...

. He arrived in

Cambridge Cambridge ( ) is a university city and the county town in Cambridgeshire, England. It is located on the River Cam approximately north of London. As of the 2021 United Kingdom census, the population of Cambridge was 145,700. Cambridge bec ...

in 1937, escaping from

anti-semitism Antisemitism (also spelled anti-semitism or anti-Semitism) is hostility to, prejudice towards, or discrimination against Jews. A person who holds such positions is called an antisemite. Antisemitism is considered to be a form of racism. Antis ...

in Austria. Realizing the perilous position of his parents in 1938, shortly before the ''

Anschluss The (, or , ), also known as the (, en, Annexation of Austria), was the annexation of the Federal State of Austria into the German Reich on 13 March 1938. The idea of an (a united Austria and Germany that would form a " Greater Germany ...

'', he sent them a telegram telling them to leave Austria at once. They managed to reach

Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...

, and later settled in New York. In the early years of World War II, he was

interned Internment is the imprisonment of people, commonly in large groups, without charges or intent to file charges. The term is especially used for the confinement "of enemy citizens in wartime or of terrorism suspects". Thus, while it can simply ...

on the

Isle of Man ) , anthem = "O Land of Our Birth" , image = Isle of Man by Sentinel-2.jpg , image_map = Europe-Isle_of_Man.svg , mapsize = , map_alt = Location of the Isle of Man in Europe , map_caption = Location of the Isle of Man (green) in Europe ...

and in

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

as a friendly enemy alien. Other internees included Thomas Gold and

Max Perutz Max Ferdinand Perutz (19 May 1914 – 6 February 2002) was an Austrian-born British molecular biologist, who shared the 1962 Nobel Prize for Chemistry with John Kendrew, for their studies of the structures of haemoglobin and myoglobin. He went ...

. In 1940, Bondi became Senior Wrangler at the University of Cambridge. Bondi and Gold were released from internment by the end of 1941, and worked with Fred Hoyle on

radar Radar is a detection system that uses radio waves to determine the distance (''ranging''), angle, and radial velocity of objects relative to the site. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, w ...

at the

Admiralty Signals Establishment Admiralty most often refers to: *Admiralty, Hong Kong *Admiralty (United Kingdom), military department in command of the Royal Navy from 1707 to 1964 *The rank of admiral *Admiralty law Admiralty can also refer to: Buildings *Admiralty, Trafa ...

. He became a British subject in 1946.

Career

Bondi lectured in mathematics at the University of Cambridge from 1945 to 1954. He was a fellow of Trinity from 1943 to 1949 and from 1952 to 1954. In 1948, Bondi, Hoyle and

Gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile met ...

formulated the Steady State theory, which holds that the universe is constantly expanding but matter is constantly created to form new stars and galaxies to maintain a constant average density. Steady State theory was eclipsed by the rival Big Bang theory with the discovery of the

cosmic microwave background In Big Bang cosmology the cosmic microwave background (CMB, CMBR) is electromagnetic radiation that is a remnant from an early stage of the universe, also known as "relic radiation". The CMB is faint cosmic background radiation filling all spac ...

(CMB). Bondi was one of the first to correctly appreciate the nature of

gravitational radiation Gravitational waves are waves of the intensity of gravity generated by the accelerated masses of an orbital binary system that propagate as waves outward from their source at the speed of light. They were first proposed by Oliver Heaviside in 1 ...

, introducing Bondi radiation coordinates, the Bondi k-calculus, the notions of

Bondi mass The concept of mass in general relativity (GR) is more subtle to define than the concept of mass in special relativity. In fact, general relativity does not offer a single definition of the term mass, but offers several different definitions that ...

and Bondi news, and writing review articles. He popularized the sticky bead argument which was said to be originally due, anonymously, to Richard Feynman, for the claim that physically meaningful gravitational radiation is indeed predicted by general relativity, an assertion which was controversial up until about 1955. A 1947 paper revived interest in the

Lemaître–Tolman metric In physics, the Lemaître–Tolman metric, also known as the Lemaître–Tolman–Bondi metric or the Tolman metric, is a Lorentzian metric based on an exact solution of Einstein's field equations; it describes an isotropic and expanding (or con ...

, an inhomogeneous, spherically symmetric

dust solution In general relativity, a dust solution is a fluid solution, a type of exact solution of the Einstein field equation, in which the gravitational field is produced entirely by the mass, momentum, and stress density of a perfect fluid that has '' ...

(often called the LTB or Lemaître–Tolman–Bondi metric). Bondi also contributed to the theory of

accretion Accretion may refer to: Science * Accretion (astrophysics), the formation of planets and other bodies by collection of material through gravity * Accretion (meteorology), the process by which water vapor in clouds forms water droplets around nucl ...

of matter from a cloud of gas onto a

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

or a

black hole A black hole is a region of spacetime where gravitation, gravity is so strong that nothing, including light or other Electromagnetic radiation, electromagnetic waves, has enough energy to escape it. The theory of general relativity predicts t ...

, working with

Raymond Lyttleton Raymond Arthur Lyttleton FRS (7 May 1911 – 16 May 1995) was a British mathematician and theoretical astronomer. He was born in Warley Woods near Birmingham and educated at King Edward VI Five Ways school in Birmingham, going from there to C ...

and giving his name to " Bondi accretion" and the "

Bondi radius Bondi could refer to: Places in Australia New South Wales * Bondi, New South Wales, a suburb of Sydney, Australia ** Bondi Beach, a beach and suburb of Sydney, Australia ** Bondi Junction, a suburb and commercial centre in Sydney, Australia * North ...

". He became a professor at

King's College London King's College London (informally King's or KCL) is a public research university located in London, England. King's was established by royal charter in 1829 under the patronage of King George IV and the Duke of Wellington. In 1836, King's ...

in 1954, and was given the title of Emeritus Professor there in 1985. He was secretary of the

Royal Astronomical Society (Whatever shines should be observed) , predecessor = , successor = , formation = , founder = , extinction = , merger = , merged = , type = NGO ...

from 1956 to 1964.

Other work

Bondi was also active outside the confines of academic lecturing and research. He held many positions: *Director-General of the

European Space Research Organisation The European Space Research Organisation (ESRO) was an international organisation founded by 10 European nations with the intention of jointly pursuing scientific research in space. It was founded in 1964. As an organisation ESRO was based on a ...

(ESRO) (1967–1971) (which later became the

European Space Agency , owners = , headquarters = Paris, Île-de-France, France , coordinates = , spaceport = Guiana Space Centre , seal = File:ESA emblem seal.png , seal_size = 130px , image = Views in the Main Control Room (1205 ...

, ESA) *Chief Scientific Adviser to the

Ministry of Defence {{unsourced, date=February 2021 A ministry of defence or defense (see spelling differences), also known as a department of defence or defense, is an often-used name for the part of a government responsible for matters of defence, found in states ...

(1971–1977) *Chief Scientific Adviser to the Department of Energy (1977–1980) *Chairman of the Natural Environment Research Council (NERC) (1980–1984) *President of the Society for Research into Higher Education (1981–1997) *President of the Hydrographic Society (1985–1987) *Master of

Churchill College, Cambridge Churchill College is a constituent college of the University of Cambridge, England. It has a primary focus on science, engineering and technology, but still retains a strong interest in the arts and humanities. In 1958, a trust was establish ...

(1983–1990). He became a fellow of the

Royal Society The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, re ...

in 1959. He made a series of television programs called ''E=mc²'' for the BBC in 1963. He was appointed a Knight Commander of the Bath in 1973. He was awarded the Einstein Society Gold Medal in 1983, the

Gold Medal A gold medal is a medal awarded for highest achievement in a non-military field. Its name derives from the use of at least a fraction of gold in form of plating or alloying in its manufacture. Since the eighteenth century, gold medals have bee ...

of the Institute of Mathematics and its Applications in 1988, the G.D. Birla International Award for Humanism, and the Gold Medal of the Royal Astronomical Society in 2001. He was awarded an Honorary Degree (Doctor of Science) by the University of Bath in 1974. His report into the flooding of London in 1953 led eventually to the building of the Thames Barrier. He also supported the proposal for a Severn Barrage to generate electricity, but this project was not carried forward. His papers from 1940 to 2000 are archived in 109 archive boxes by the Janus Project.The Papers of Sir Hermann Bondi
(Janus Project)

Personal life

His parents were

Jewish Jews ( he, יְהוּדִים, , ) or Jewish people are an ethnoreligious group and nation originating from the Israelites Israelite origins and kingdom: "The first act in the long drama of Jewish history is the age of the Israelites""The ...

, but he never "felt the need for religion" and was a lifelong humanist. He was president of the British Humanist Association from 1982 to 1999, and president of the

Rationalist Press Association The Rationalist Association, originally the Rationalist Press Association, is an organization in the United Kingdom, founded in 1885 by a group of freethinkers who were unhappy with the increasingly political and decreasingly intellectual tenor ...

from 1982. He was one of the signers of the Humanist Manifesto. He married Christine Stockman, also a mathematician and astronomer, in 1947; she had been one of Hoyle's research students and like him she went on to be active in the humanist movement. Together, they had two sons and three daughters, one of whom is Professor Liz Bondi, feminist geographer at the University of Edinburgh. He died in Cambridge in 2005, aged 85GRO Register of deaths: SEP 2005 D67C 21 CAMBRIDGE – Hermann Bondi, DoB = 1 Nov 1919, aged 85 and his ashes were scattered at

Anglesey Abbey Anglesey Abbey is a National Trust property in the village of Lode, northeast of Cambridge, England. The property includes a country house, built on the remains of a priory, 98 acres (400,000 m2) of gardens and landscaped grounds, and a working ...

near Cambridge. Christine died in 2015.

References and notes

External links