Oskar Klein (September 15, 1894 - February 5, 1977) was a Swedish theoretical physicist. is the 258th day of the year (259th in leap years) in the Gregorian calendar. ... 1894 (MDCCCXCIV) was a common year starting on Monday (see link for calendar). ... is the 36th day of the year in the Gregorian calendar. ... Also: 1977 (album) by Ash. ... Not to be confused with physician, a person who practices medicine. ...

Klein was born in Danderyd outside Stockholm, son of the chief rabbi of Stockholm, Dr. Gottlieb Klein and Antonie (Toni) Levy. He became a student of Svante Arrhenius at the Nobel Institute at a young age, and was on the way to Jean-Baptiste Perrin in France when World War I broke out and he was drafted into the military. Djursholm Chapel Danderyd is a Municipality in Stockholm County, in central Sweden. ... For other uses, see Stockholm (disambiguation). ... Svante August Arrhenius (February 19, 1859 – October 2, 1927) was a Swedish chemist and one of the founders of the science of physical chemistry. ... The Institutes building in central Oslo, Norway. ... Jean Baptiste Perrin (September 30, 1870 - April 17, 1942) was born in Lille, France where he attended École Normale Supérieure. ...

From 1917 he worked a few years with Niels Bohr in Copenhagen and received his doctoral degree at the University College of Stockholm (now Stockholm University) in 1921. In 1923 he received a professorship at University of Michigan in Ann Arbor and moved there with his recently wedded wife, Gerda Koch from Denmark. Klein returned to Copenhagen in 1925, spent some time with Paul Ehrenfest in Leiden, then became docent at Lund University in 1926 and in 1930 accepted the offer of the professorial chair in physics at the Stockholm University College, which had previously been held by Ivar Fredholm until his death in 1927; Klein retired as professor emeritus in 1962. He was awarded the Max Planck medal in 1959. Niels Henrik David Bohr (October 7, 1885 – November 18, 1962) was a Danish physicist who made fundamental contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in 1922. ... Main campus on Frue Plads. ... Stockholm University (Stockholms universitet) is a state university in Stockholm, Sweden. ... Stockholm University (Stockholms universitet) is a state university in Stockholm, Sweden. ... The University of Michigan, Ann Arbor (U of M, UM or simply Michigan) is a coeducational public research university in the state of Michigan, and one of the foremost universities in the United States. ... Ann Arbor redirects here. ... Paul Ehrenfest Paul Ehrenfest (Vienna, January 18, 1880 – Amsterdam, September 25, 1933) was an Austrian physicist and mathematician, who obtained Dutch citizenship on March 24, 1922. ... Coordinates: , Country Province Area (2006)  - Municipality 23. ... In the United States (but not in the United Kingdom, where the word is not used), a docent (the word being derived from the Latin word docÄ“re, meaning to teach) is officially defined as a professor or university lecturer, but the term has been expanded to designate the corps... Lund University (Swedish: ), located in Lund in southernmost Sweden, is one of Swedens most prestigious universities[2] and Scandinavias largest institution for education and research[3], frequently ranked among the worlds top 100 universities[4][5]. The university was founded in 1666 and is the second oldest... Erik Ivar Fredholm (April 7, 1866 - August 17, 1927) was a Swedish mathematician who established the modern theory of integral equations. ... The Max Planck medal is an award for extraordinary achievements in theoretical physics. ...

Klein is credited for inventing the idea, part of Kaluza-Klein theory, that extra dimensions may be physically real but curled up and very small, an idea essential to string theory / M-theory. He is also well known for his theory on time travel which involves tiny invisible particles orbiting atoms. Although widely respected as a theory it has been established that the current technology involving the examination of subatomic particles does not allow for this theory to be proven or refuted. In physics, Kaluza-Klein theory (or KK theory, for short) is a model that seeks to unify the two fundamental forces of gravitation and electromagnetism. ... 2-dimensional renderings (ie. ... Interaction in the subatomic world: world lines of pointlike particles in the Standard Model or a world sheet swept up by closed strings in string theory String theory is a model of fundamental physics, whose building blocks are one-dimensional extended objects called strings, rather than the zero-dimensional point... M-theory is a solution proposed for the unknown theory of everything which would combine all five superstring theories and 11-dimensional supergravity together. ...

The Oskar Klein Memorial Lecture, held annually at the University of Stockholm, has been named after him. The Oskar Klein Memorial Lecture at Stockholm University, dedicated to the memory of the Swedish physicist Oskar Klein (1894-1977), is held annually since 1988 by a prominent physicist, who also receives the Oskar Klein Medal. ...

See also

• Klein-Gordon equation
• Klein-Nishina formula
• Klein fluid
• Alfvén-Klein model
• Klein paradox

The Klein-Gordon equation (Klein-Fock-Gordon equation or sometimes Klein-Gordon-Fock equation) is the relativistic version of the Schrödinger equation. ... The Klein-Nishina formula provides an accurate prediction of the angular distribution of x-rays and gamma-rays which are incident upon a single electron. ... The Alfvén-Klein model is an astrophysical model in which there is one giant astrophysical explosion, resulting from a quick touch-down mixing of matter and antimatter that creates the universe (or meta-galaxy as they preferred to speculate). ... The Klein Paradox is a particle interacting with a potential and receiving three particles as a solution to the problem. ...

External links

• MacTutor biography of Oskar Klein