Vladimir Jurko Glaser (21 April 1924 – 22 January 1984) was a

Croatia , image_flag = Flag of Croatia.svg , image_coat = Coat of arms of Croatia.svg , anthem = " Lijepa naša domovino"("Our Beautiful Homeland") , image_map = , map_caption = , capi ...

theoretical physicist Theoretical physics is a branch of physics that employs mathematical models and abstractions of physical objects and systems to rationalize, explain and predict natural phenomena. This is in contrast to experimental physics, which uses experime ...

working on

quantum field theory In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines classical field theory, special relativity, and quantum mechanics. QFT is used in particle physics to construct physical models of subatomic particles and ...

and the canonization of the analytic

S-matrix In physics, the ''S''-matrix or scattering matrix relates the initial state and the final state of a physical system undergoing a scattering process. It is used in quantum mechanics, scattering theory and quantum field theory (QFT). More forma ...

Biography

Glaser was born in

Gorizia Gorizia (; sl, Gorica , colloquially 'old Gorizia' to distinguish it from Nova Gorica; fur, label= Standard Friulian, Gurize, fur, label= Southeastern Friulian, Guriza; vec, label= Bisiacco, Gorisia; german: Görz ; obsolete English ''Gori ...

Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...

. His father, Vladimir Glaser, was a prominent Slovene lawyer and minority rights activist. His mother, Ana née Besednjak, was the sister of the politician

Engelbert Besednjak Engelbert Besednjak (March 14, 1894 – December 21, 1968) was a Slovene Christian Democrat politician, lawyer and journalist. In the 1920s, he was one of the foremost leaders of the Slovene and Croat minority in the Italian-administered Julian Ma ...

. His paternal aunt Eleonora (Lola) was married to the famous neurologist

Constantin von Economo Constantin Freiherr von Economo ( gr, Κωνσταντίνος Οικονόμου; 21 August 1876 – 21 October 1931) was an Austrian psychiatrist and neurologist of Greek descent, born in modern-day Romania (then Ottoman Empire). He is mos ...

. The family fled to Yugoslavia in 1929, first to

Maribor Maribor ( , , , ; also known by other historical names) is the second-largest city in Slovenia and the largest city of the traditional region of Lower Styria. It is also the seat of the City Municipality of Maribor, the seat of the Drava sta ...

, then to

Belgrade Belgrade ( , ;, ; names in other languages) is the capital and largest city in Serbia. It is located at the confluence of the Sava and Danube rivers and the crossroads of the Pannonian Plain and the Balkan Peninsula. Nearly 1,166,763 mi ...

Odžaci Odžaci ( sr-cyrl, Оџаци, ; hu, Hódság) is a town and municipality located in the West Bačka District of the autonomous province of Vojvodina, Serbia. The town of Odžaci has a population of 8,795 people, while the population of the mu ...

and finally to

Zagreb Zagreb ( , , , ) is the capital (political), capital and List of cities and towns in Croatia#List of cities and towns, largest city of Croatia. It is in the Northern Croatia, northwest of the country, along the Sava river, at the southern slop ...

in 1941. He graduated

physics Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge which ...

from the

University of Zagreb The University of Zagreb ( hr, Sveučilište u Zagrebu, ; la, Universitas Studiorum Zagrabiensis) is the largest Croatian university and the oldest continuously operating university in the area covering Central Europe south of Vienna and all of ...

in 1949 and later was attending seminar of

Werner Heisenberg Werner Karl Heisenberg () (5 December 1901 – 1 February 1976) was a German theoretical physicist and one of the main pioneers of the theory of quantum mechanics. He published his work in 1925 in a Über quantentheoretische Umdeutung kinematis ...

(1951-52) at

Göttingen Göttingen (, , ; nds, Chöttingen) is a university city in Lower Saxony, central Germany, the capital of the eponymous district. The River Leine runs through it. At the end of 2019, the population was 118,911. General information The ori ...

. Based on work carried out in

under Heisenberg he received a doctorate degree from the

. Being a part of Heisenberg's group at

he later worked with many famous physicists such as Harry Lehmann, Wolfhart Zimmermann (on extensions of LSZ formalism) and Walter Thirring. From 1955 to 1957 he was head of the Department of Theoretical Physics at the

Ruđer Bošković Institute The Ruđer Bošković Institute (RBI; hr, Institut Ruđer Bošković, , IRB) is a research institute located in the Šalata neighborhood of Zagreb, Croatia, founded in 1950, which studies the sciences. Description It is the largest Croatian resea ...

. In 1957 he found a

permanent employment Permanent employees work for an employer and are paid directly by that employer. Permanent employees do not have a predetermined end date to employment. In addition to their wages, they often receive benefits like subsidized health care, paid vac ...

at the Department of Theoretical Physics of

CERN The European Organization for Nuclear Research, known as CERN (; ; ), is an intergovernmental organization that operates the largest particle physics laboratory in the world. Established in 1954, it is based in a northwestern suburb of Gen ...

Geneva Geneva ( ; french: Genève ) frp, Genèva ; german: link=no, Genf ; it, Ginevra ; rm, Genevra is the second-most populous city in Switzerland (after Zürich) and the most populous city of Romandy, the French-speaking part of Switzerland. Situa ...

. He died in

. In 1955, he published one of the first monographs on

quantum electrodynamics In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and spec ...

, ''Kovarijantna kvantna elektrodinamika'' (in Croatian). With

French French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with Franc ...

physicists Jacques Bros and

Henri Epstein Henri is an Estonian, Finnish, French, German and Luxembourgish form of the masculine given name Henry. People with this given name ; French noblemen :'' See the ' List of rulers named Henry' for Kings of France named Henri.'' * Henri I de Mon ...

he worked on setting up analyticity properties required for the use of dispersion relations in high energy collisions.

Epstein The surname Epstein ( yi, עפּשטײן, Epshteyn) is one of the oldest Ashkenazi Jewish family names. It is probably derived from the German town of Eppstein, in Hesse; the place-name was probably derived from Gaulish ''apa'' ("water", in the sen ...

, Glaser and

Arthur Jaffe Arthur Michael Jaffe (; born December 22, 1937) is an American mathematical physicist at Harvard University, where in 1985 he succeeded George Mackey as the Landon T. Clay Professor of Mathematics and Theoretical Science. Education and career ...

proved that (Wightman) quantum fields can necessarily have negative energy density values. Together with

, he found a new approach to

renormalization Renormalization is a collection of techniques in quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, that are used to treat infinities arising in calculated quantities by altering va ...

theory called

causal perturbation theory Causal perturbation theory is a mathematically rigorous approach to renormalization theory, which makes it possible to put the theoretical setup of perturbative quantum field theory on a sound mathematical basis. It goes back to a seminal wor ...

, where

ultraviolet divergence In physics, an ultraviolet divergence or UV divergence is a situation in which an integral, for example a Feynman diagram, diverges because of contributions of objects with unbounded energy, or, equivalently, because of physical phenomena at infi ...

s are avoided in the calculation of

Feynman diagrams In theoretical physics, a Feynman diagram is a pictorial representation of the mathematical expressions describing the behavior and interaction of subatomic particles. The scheme is named after American physicist Richard Feynman, who introduce ...

by using mathematically well-defined quantities only.

References

Croatian physicists Slovenian physicists People associated with CERN 1924 births 1984 deaths Italian emigrants to Yugoslavia Yugoslav physicists {{physicist-stub