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Harry Lehmann
Harry Lehmann (21 March 1924 in Güstrow22 November 1998 in Hamburg) was a German physicist. Biography Lehmann studied physics at Rostock and the Humboldt-Universität zu Berlin. In 1952 he worked at the Max-Planck-Institut in Göttingen, and spent a year in Copenhagen and from 1956 worked in Hamburg. In 1967 he won the Max Planck Medal for extraordinary achievements in theoretical physics. It is awarded annually by the Deutsche Physikalische Gesellschaft (german: German Physical Society). The 'L' in the LSZ reduction formula refers to Harry Lehmann. See also * Källén–Lehmann spectral representation Notes References *Karl von Meyenn (ed.), ''Wolfgang Pauli. Wissenschaftlicher Briefwechsel'', Vol. IV, Part III, Briefwechsel 1955/56, Springer Verlag, p. 68ff, Wolfhart Zimmermann Wolfhart Zimmermann (17 February 1928 – 18 September 2016) was a German theoretical physicist. Zimmermann attained a doctorate in 1950 at Freiburg im Breisgau in topology ("Eine Kohomol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harry Lehmann
Harry Lehmann (21 March 1924 in Güstrow22 November 1998 in Hamburg) was a German physicist. Biography Lehmann studied physics at Rostock and the Humboldt-Universität zu Berlin. In 1952 he worked at the Max-Planck-Institut in Göttingen, and spent a year in Copenhagen and from 1956 worked in Hamburg. In 1967 he won the Max Planck Medal for extraordinary achievements in theoretical physics. It is awarded annually by the Deutsche Physikalische Gesellschaft (german: German Physical Society). The 'L' in the LSZ reduction formula refers to Harry Lehmann. See also * Källén–Lehmann spectral representation Notes References *Karl von Meyenn (ed.), ''Wolfgang Pauli. Wissenschaftlicher Briefwechsel'', Vol. IV, Part III, Briefwechsel 1955/56, Springer Verlag, p. 68ff, Wolfhart Zimmermann Wolfhart Zimmermann (17 February 1928 – 18 September 2016) was a German theoretical physicist. Zimmermann attained a doctorate in 1950 at Freiburg im Breisgau in topology ("Eine Kohomol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LSZ Reduction Formula
In quantum field theory, the LSZ reduction formula is a method to calculate ''S''-matrix elements (the scattering amplitudes) from the time-ordered correlation functions of a quantum field theory. It is a step of the path that starts from the Lagrangian of some quantum field theory and leads to prediction of measurable quantities. It is named after the three German physicists Harry Lehmann, Kurt Symanzik and Wolfhart Zimmermann. Although the LSZ reduction formula cannot handle bound states, massless particles and topological solitons, it can be generalized to cover bound states, by use of composite fields which are often nonlocal. Furthermore, the method, or variants thereof, have turned out to be also fruitful in other fields of theoretical physics. For example, in statistical physics they can be used to get a particularly general formulation of the fluctuation-dissipation theorem. In and out fields ''S''-matrix elements are amplitudes of transitions between ''in'' states an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Hamburg Faculty
A university () is an institution of higher (or tertiary) education and research which awards academic degrees in several academic disciplines. Universities typically offer both undergraduate and postgraduate programs. In the United States, the designation is reserved for colleges that have a graduate school. The word ''university'' is derived from the Latin ''universitas magistrorum et scholarium'', which roughly means "community of teachers and scholars". The first universities were created in Europe by Catholic Church monks. The University of Bologna (''Università di Bologna''), founded in 1088, is the first university in the sense of: *Being a high degree-awarding institute. *Having independence from the ecclesiastic schools, although conducted by both clergy and non-clergy. *Using the word ''universitas'' (which was coined at its foundation). *Issuing secular and non-secular degrees: grammar, rhetoric, logic, theology, canon law, notarial law.Hunt Janin: "The university ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winners Of The Max Planck Medal
Winners Merchants International L.P is a chain of off-price Canadian department stores owned by TJX Companies. It offers brand name clothing, footwear, bedding, furniture, fine jewelry, beauty products, and housewares. Products are at a 20-60% discount rate and the stores generally do not carry the same merchandise for an entire season. The firm does not sell online. Its market niche is similar to the American store TJ Maxx, and it is a partnered retailer to department stores HomeSense and Marshalls. History In 1982, Winners was founded in Toronto, Ontario by David Margolis and Neil Rosenberg. It was one of the first off-price department stores in Canada. In 1990, it merged with TJX Companies, the world's largest off-price department store owner. Since late 2001, Winners stores have been paired with HomeSense, a home accessory retailer, modelled on TJX's American HomeGoods stores. Winners acquired the struggling "Labels" brand from Dylex in 2001. Labels had been meant to c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
People From Güstrow
A person ( : people) is a being that has certain capacities or attributes such as reason, morality, consciousness or self-consciousness, and being a part of a culturally established form of social relations such as kinship, ownership of property, or legal responsibility. The defining features of personhood and, consequently, what makes a person count as a person, differ widely among cultures and contexts. In addition to the question of personhood, of what makes a being count as a person to begin with, there are further questions about personal identity and self: both about what makes any particular person that particular person instead of another, and about what makes a person at one time the same person as they were or will be at another time despite any intervening changes. The plural form "people" is often used to refer to an entire nation or ethnic group (as in "a people"), and this was the original meaning of the word; it subsequently acquired its use as a plural form of per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1998 Deaths
This is a list of deaths of notable people, organised by year. New deaths articles are added to their respective month (e.g., Deaths in ) and then linked here. 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 See also * Lists of deaths by day The following pages, corresponding to the Gregorian calendar, list the historical events, births, deaths, and holidays and observances of the specified day of the year: Footnotes See also * Leap year * List of calendars * List of non-standard ... * Deaths by year {{DEFAULTSORT:deaths by year ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1924 Births
Nineteen or 19 may refer to: * 19 (number), the natural number following 18 and preceding 20 * one of the years 19 BC, AD 19, 1919, 2019 Films * ''19'' (film), a 2001 Japanese film * ''Nineteen'' (film), a 1987 science fiction film Music * 19 (band), a Japanese pop music duo Albums * ''19'' (Adele album), 2008 * ''19'', a 2003 album by Alsou * ''19'', a 2006 album by Evan Yo * ''19'', a 2018 album by MHD * ''19'', one half of the double album ''63/19'' by Kool A.D. * ''Number Nineteen'', a 1971 album by American jazz pianist Mal Waldron * ''XIX'' (EP), a 2019 EP by 1the9 Songs * "19" (song), a 1985 song by British musician Paul Hardcastle. * "Nineteen", a song by Bad4Good from the 1992 album '' Refugee'' * "Nineteen", a song by Karma to Burn from the 2001 album ''Almost Heathen''. * "Nineteen" (song), a 2007 song by American singer Billy Ray Cyrus. * "Nineteen", a song by Tegan and Sara from the 2007 album '' The Con''. * "XIX" (song), a 2014 song by Slipk ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wolfhart Zimmermann
Wolfhart Zimmermann (17 February 1928 – 18 September 2016) was a German theoretical physicist. Zimmermann attained a doctorate in 1950 at Freiburg im Breisgau in topology ("Eine Kohomologietheorie topologischer Räume"). Biography Zimmermann was born in Freiburg im Breisgau. In the 1950s he lived in Göttingen and was one of the pioneers of the mathematical quantum field theory. He developed the LSZ theory with Kurt Symanzik and Harry Lehmann. From 1962 to 1974 he was a professor at the New York University. From 1974 to 1996 he was a director at the Max Planck Institute for physics in Munich, later becoming the "Director Emeritus". Since 1977 he was an honorary professor ("Honorarprofessor") at TU Munich. He took a year-long sabbatical stay at the Institute for Advanced Study in Princeton (1957/8 and 1960/1), at the Courant Institute of Mathematical Sciences of New York University, at the University of Chicago and at IHES in Paris. In addition to his work on the LSZ formalis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Källén–Lehmann Spectral Representation
The Källén–Lehmann spectral representation gives a general expression for the (time ordered) two-point function of an interacting quantum field theory as a sum of free propagators. It was discovered by Gunnar Källén and Harry Lehmann independently. This can be written as, using the mostly-minus metric signature, :\Delta(p)=\int_0^\infty d\mu^2\rho(\mu^2)\frac, where \rho(\mu^2) is the spectral density function that should be positive definite. In a gauge theory, this latter condition cannot be granted but nevertheless a spectral representation can be provided. This belongs to non-perturbative techniques of quantum field theory. Mathematical derivation The following derivation employs the mostly-minus metric signature. In order to derive a spectral representation for the propagator of a field \Phi(x), one consider a complete set of states \ so that, for the two-point function one can write :\langle 0, \Phi(x)\Phi^\dagger(y), 0\rangle=\sum_n\langle 0, \Phi(x), n\rangle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deutsche Physikalische Gesellschaft
The German Physical Society (German: , DPG) is the oldest organisation of physicists. The DPG's worldwide membership is cited as 60,547, as of 2019, making it the largest physics society in the world. It holds an annual conference () and multiple spring conferences (), which are held at various locations and along topical subjects of given sections of the DPG. The DPG serves the fields of pure and applied physics. Main aims are to bring its members and all physicists living in Germany closer together, represent their entirety outwards as well as foster the exchange of ideas between its members and foreign colleagues. The DPG binds itself and its members to advocate for freedom, tolerance, veracity and dignity in science and to be aware about the fact that the people working in science are responsible to a particularly high extent for the configuration of the overall human activity. Conferences and fostering young talent The DPG itself does not carry out any research, but its confer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Güstrow
Güstrow (; la, Gustrovium) is a town in Mecklenburg-Vorpommern, Germany. It is capital of the Rostock district; Rostock itself is a district-free city and regiopolis. It has a population of 28,999 (2020) and is the seventh largest town in Mecklenburg-Western Pomerania. Since 2006 Güstrow has had the official suffix ''Barlachstadt''. The town is known for its renaissance Güstrow Palace, the old town and its brick gothic cathedral with Barlach's ''Floating Angel'' sculpture. Geography Güstrow is 45 kilometers south of Rostock at the Nebel, an arm of the Warnow. The Bützow-Güstrow-Kanal (channel) is a navigable connection to the Warnow and used by water tourists. There are five lakes (''Inselsee, Sumpfsee, Parumer See, Grundloser See and Gliner See'' ake and several forests around Güstrow. History The name Güstrow comes from the Polabian Guščerov and means lizard place. In 1219 the Wendish castle Güstrowe was built where the renaissance palace stands now. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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