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Øyvind Grøn
Øyvind Grøn (born 11 March 1944) is a Norwegian physicist.
He was born in Oslo, and is a twin. He took the cand. real. degree at the University of Oslo in 1973, majoring in meteorology. He followed up with the PhD degree in 1990 with a thesis on repulsive gravitation.〔Repulsive gravitation, Dr. thesis at Universitetet of Oslo〕 He started his academic career as a research assistant at the University of Oslo, and has also been a lecturer there. He was appointed as a professor at Oslo University College in 1994, having been an associate professor since 1985. He has also been professor II at the University of Oslo since 1994.
He has been a member of the editorial board of the ''European Journal of Physics''. He is also known for his popular contributions, through the Norwegian Broadcasting Corporation, in popular articles and lectures, in books〔 as well as the encyclopedias ''Store norske leksikon'' and ''Norsk biografisk leksikon''.
==Scientific profile==
Grøn has conducted research within the areas of general relativity, cosmology and classical electromagnetism. He has thrown new light on themes like the twin paradox,〔Ø. Grøn, The twin paradox in the theory of relativity. Eur. J. Phys. 27, 885-889 (2006)〕 the physics in a rotating reference system (Ehrenfest paradox)〔Ø. Grøn, Relativistic description of a rotating disk. Am. J. Phys. 43, 869-976 (1975)〕 and repulsive gravitation associated with vacuum energy.〔Ø. Grøn, Repulsive gravitation, Dr. Thesis at University of Oslo, 1990〕 Together with Erik Eriksen at the University of Oslo he has also studied properties of the electromagnetic field produced by accelerated electric charges. They have in particular shown how gravitation impacts such fields.〔Eriksen and Ø. Grøn, Electrodynamics of hyperbolically accelerated charges V: The field of a charge in the Rindler space and the Milne space. Ann. Phys. 313, 147-196 (2004)〕 Grøn has also found new solutions to equations in Einstein's theory of gravity that describe time space where one can travel backwards in time.〔Ø. Grøn and S. Johannesen, Closed timelike geodesics in a gas of cosmic strings. New Journal of Physics (2008)〕 In several studies Grøn has focused on relativistic models of the universe. He has, among other things, shown that it is possible to interpret observations from cosmos so that the concept of dark energy is unnecessary.〔H. Alnes, M. Amarzguioui, An inhomogeneous alternative to dark energy? Phys.Rev. D73 083519 (2006)〕 The relationship between gravitation and time and between gravitation and entropy are also themes where Grøn has contributed several journal articles.〔Ø. Grøn and S. Hervik, Gravitational entropy and quantum cosmology. Classical and Quantum Gravity 18, 601-918 (2001)〕 He has also contributed to the Kaluza-Klein theory that represents a geometric and unified theory of electromagnetism and gravitation. According to this theory the world is five-dimensional with a compact spatial dimension so small that it is not observable directly. He has shown that the electric field around a charged particle is the projection of the relativistic inertial dragging field caused by the particle's movement around the fifth dimension in our four-dimensional spacetime.〔Ø. Grøn, Inertial dragging and Kaluza-Klein theory. Int. J. Mod. Phys. A20, 2270-2274 (2005).〕 Grøn has written three books on the theory of relativity.
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